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Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
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109
no.
2018
1
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http://www.gsjournal.ir/article_80286_0bbb0da74b83989eae50784974017e1e.pdf
reviewer
text
article
2018
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reviewer
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
2
2
http://www.gsjournal.ir/article_80287_eb95a89f611dbd9e0695c546cc2621f2.pdf
Subsidence prediction for twin tunnels using empirical formula – A case study: Isfahan, Iran.
H.
Bakhshandeh Amnieh
Associate Professor, School of Mining, College of Engineering, University of Tehran, Tehran, Iran
author
Amirhossein
Rostami
Ph.D. Student, Faculty of Engineering, University of Kashan, Kashan, Iran
author
Kurosh
Shahriar
Professor, Faculty of Mining and Metallurgy Engineering, Amir Kabir University, Tehran, Iran
author
Hamid
Chakeri
Assistant Professor, Faculty of Mining Engineering, Sahand University of Technology, Tabriz, Iran
author
Masoud
Cheraghi Seifabad
Associate Professor, Faculty of Mining Engineering, Isfahan University of Technology, Isfahan, Iran
author
text
article
2018
per
Abstract In the urban tunneling project, one of the most important parameters to be considered is the subsidence level. Metro tunnels are one of the most important urban transportation infrastructures. Due to shallow depth of drilling, the most important factors to prevent the maximum subsidence and subsequent damage of surface and subsurface structures are deformation control and shear forces. The various methods of estimating the subsidence are divided in three categories, namely; Empirical, analytical and numerical methods. In this research, according to the geotechnical conditions of the study area using the data collected from the monitoring during the excavation of twin tunnels of metro by TBM, the empirical methods for the subsidence ( s=A_2+s_max/2 ), the maximum subsidence (s_max=A_1-A_2 ) and the inflection point (ⅈ=x_0 ) are presented by using Boltzmann function for Isfahan twin metro tunnel. Keywords: Subsidence, Maximum subsidence, Inflection point, Empirical Method, Analytical Method, Numerical Method, TBM.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
3
6
http://www.gsjournal.ir/article_68704_9d53bb5eda9193f5c1de35d4955da06c.pdf
dx.doi.org/10.22071/gsj.2017.97965.1253
Kinematic dissimilarity analyses Dourd fault(southwestern Iran), using by Fractal, kernel and Morphotectonic
zahra
kamali
Ph.D. Student, Department of Geology, University of Birjand, Birjand, Iran
author
magmodreza
Hayhat
- Associate Professor Department of Earth Sciences, Birjand University
author
hamid
nazari
Associate Professor, Research Institute for Earth sciences, Geological Survey of Iran
author
mohammd mahdi
khatib
- Professor, Department of Earth Sciences, Birjand University, Birjand
author
text
article
2018
per
The Dorud fault, as one of the most important seismicin segments of Zagros main recent fault, near the Arjng area it have northwest-southeast trend and continuity extended in Boroujerd area. This area is determined Kinematic dissimilarity fault the fractal analysis of the fractures, the center of earthquakes and drainage using the of box method, For this purpose, the study area was divided into two parts based on the difference in distribution of fractures and epicenter earthquakes. Fractal dimensions of fractures, drainage and epicenter earthquakes are calculated and then compared with each other. Kernel density method to investigate the epicenter earthquakes distribution and drainage in the long fault to rate the dissimilar activity that .In the end, the analysis of evidence Morphotectonic that long it’s to determine the horizontal, vertical displacements and net slip to be paid. Fractal analysis on Kernel density method and evidence Morphotectonic. In the end, the analysis of that long it’s to determine the horizontal, vertical displacements and net slip to be paid. So that results of fractal to indicate that the northern segment of the most dynamic segment spread to be identified. Also The results of the kernel analysis and evidence Morphotectonic indicates that neither the fault that along with passing of units of different ages show different behavior and the amount of angle Rick obtained along the fault is different according to the results achieved in three segment to different long can be divided, so that angle Rick segments 1 and2 respectively126°/16° and124°/22° and long segments respectively 18 and48 kilometer, to notice the high values of rick (more of10°) the two segments have a dominant effect of the component dip- slip relative to strike-slip but the angle rick 131°/4° in segment 3indicate of the action component strike slip that the units alluvial are plain Silakhor this segment long is 44 kilometer.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
7
22
http://www.gsjournal.ir/article_68691_bc209e34eb73015083a0b9441550735e.pdf
dx.doi.org/10.22071/gsj.2017.87288.1125
Microfacies Analysis and Reservoir characterization Low Resistivity Pay, Dariyan Formation, Southeastern of Persian Gulf
Bita
Arbab
Ph.D. Student, Department of Geology, Faculty of Basic Science, Islamic Azad University, North Tehran Branch, Tehran, Iran
author
Davood
Jahani
Associate Professor, Department of Geology, Basic Science Faculty, North Tehran branch,Islamic Azad University, Tehran, Iran.
author
Bahram
Movahed
Assistant Professor, Department of Geology, Basic Science Faculty, North Tehran branch, Islamic Azad University, Tehran, Iran
author
text
article
2018
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The Aptian Shuaiba deposits, in southeastern of Persian Gulf due to having resistivity less than 6 to 1 ohm.m, is considered as low resistivity pay zone. On the basis of experimental studies 8 microfacies defined which settled in a carbonate platform of homoclinal ramp model that belong to outer, middle, inner ramp. Existence micro porosity in the microfacies is main reason for lowering resistivity. Various digenetic process are seen such as micritization and pyritization which have noticeable impact on declining resistivity. Lønøy method applied to address pore throat sizes which contain Intercrystalline porosity, Chalky limestone, Mudstone micro porosity. Pore systems are at class 3 Lucia. NMR logs and core data have been used for defining reliable water saturation and reservoir characterization. Results explain that decreasing of resistivity in pay zone is related to texture and grain size variation not being existence of moved water .Irreducible water estimate for this reservoir between 30 to 50 %.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
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109
no.
2018
23
32
http://www.gsjournal.ir/article_68684_135901b6d90f8e97f42f3d6787060214.pdf
dx.doi.org/10.22071/gsj.2017.79545.1062
Application of hybrid AHP-TOPSIS method for prospectivity modeling of Cu porphyry in Varzaghan district, Iran
Reza
Ghezelbash
Ph.D. Student, Faculty of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
author
A.
Maghsoudi
Assistant Professor, Faculty of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
author
text
article
2018
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Varzaghan district is located in NW of Arasbaran magmatic belt (AMB) which is one of the most highly mineralized region in Iran and host to a significant number of porphyry Cu deposits such as Sungun Cu-Mo porphyry deposit. The main goal of this study is synthesizing diverse raster-based evidence layers including geochemical, alteration and geological geo-data sets for mineral prospectivity modeling (MPM). For this purpose, firstly, continuous values of six favorable evidential maps as main criteria (geochemical signature of PC1 scores, values of proximity to argillic, phyllic and iron-oxide alterations, values of proximity to Oligo-Miocene intrusions and fault density) were divided into reasonable classes by applying concentration-area fractal model and then discretized layers were integrated using analytical hierarchy process (AHP) and technique for order preference by similarity to ideal solution (TOPSIS) to generate a final map of porphyry Cu potential within the central part of Varzaghan district. Finally, the success-rate curve of the AHP-TOPSIS model as a quantitative evaluation method according to the locations of known Cu occurrences was drawn. Results revealed the successful performance of AHP-TOPSIS model in portraying the prospective areas related to porphyry Cu mineralization.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
33
42
http://www.gsjournal.ir/article_68689_810c786600ecea83c8d4ca308b2ee6b3.pdf
dx.doi.org/10.22071/gsj.2017.86299.1107
Monitoring thermal changes of Damavand Volcano using Landsat images
A.
Eskandari
Ph.D., Faculty of Geological Science, Kharazami University, Tehran, Iran
author
S.
Amini
Professor, Faculty of Geological Science, Kharazmi University, Tehran, Iran
author
F.
Masoudi
Professor, Faculty of Geological Science, Shahid Beheshti University, Tehran, Iran
author
text
article
2018
per
Monitoring quiescent volcano such as Damavan is vital. In this research, we investigate the changes of land surface temperature (LST) around the Damavand volcano during 23 years period. The evaluations were done on the thermal anomaly areas related to geothermal activity and results compared with non-anomalously thermal areas. The surface thermal anomalies were detected on the basis of processing of Landsat day and night-time images and combination with geological information layers. The average of calculated values for geothermal heat flux (GHF) in the geothermal areas was 42 W/m2 (in the day-time image) and 20 W/m2 (in night-time image). The total radiant GHF in thermal anomaly areas estimated 50 MW (in night-time image) and 119 MW (in the day-time image). The thermal anomaly areas have a close spatial relationship with faults, hot springs, lithology, hydrothermal alterations, active deformation regions and subsurface high heat flow data. After determining thermal anomaly areas related to the geothermal activity, the changes of LST patterns were compared in the six TM and ETM+ images (captured from the same month and overpass time) during 1988- 2011. The highest temperatures were recorded in 2002 and 2007 images, that in line with seismic events and changes in hot springs chemistry. The thermal infrared remote sensing can be used as a cost effective and concise method for monitoring of quiescent and even dormant volcanoes of Iran.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
43
54
http://www.gsjournal.ir/article_68702_79e4510f6134fdb0335b2f8eee29badf.pdf
dx.doi.org/10.22071/gsj.2017.93384.1212
Investigation of geochemistry, mineral chemistry and changes in magnetite mineralization generations in the Khak Sorkh iron skarn, west of Yazd.
S.
Maleki
Ph.D. Student, Department of Geology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
author
A. A.
Calagari
Professor, Department of Geology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
author
K.
Siahcheshm
Assistant professor, Department of Geology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
author
S.
Alirezaei
Assistant professor, Earth Science Department, Shahid Beheshti University, Tehran, Iran
author
text
article
2018
per
Khak Sorkh iron deposit located about 42 km northwest of Nadushan town in Yazd Province. Host rock include upper Triassic-Jurassic limestone which are intruded by Oligo-Miocene granitoid bodies. Mineralization is dominated by magnetite, and serpentine is the main waste mineral. Skarn mineral assemblages include clinopyroxene, garnet, tremolite phlogopite and epidote. The characteristics of mineralization are: magnetite mineralization in two generations, presence of serpentine as the main waste mineral, hornfelsed greywacke units which come between intrusive bodies and skarned limestone units, absence of obvious zoning in endoskarn and exoskarn parts, presence of Ni-Co-As sulfides, high amount of Zn, As, Co and Mn in magnetite geochemical results and the increasing Fe along with decreasing Mg contents in magnetite at both deposit and crystal scales from primary to secondary types. Minor elements contents of geochemical results have been used for distinguishing of different mineral deposits (e.g, Dare et al., 2012; Dupuis and Beaudoin, 2011; Nadoll et al., 2012) and they are in good accordance to hydrothermal and skarn type deposits like: low contents of Cr (less than 10 ppm), high contents of Mg (2.2 to 7.5 ppm), low TiO2 (from 0.01 to 0.3 ppm), low amounts of incompatible elements including Ag (
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
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109
no.
2018
55
66
http://www.gsjournal.ir/article_45919_a877f82436997ea5c9c096cf8bb0df84.pdf
dx.doi.org/10.22071/gsj.2017.70407.1006
Diagenetic processes of the Shahbazan Formation in the east of the Lurestan zone
Mohadeseh
Janbaz
Ph.D., Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
author
Hassan
Mohseni
Associate Professor, Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
author
Alireza
Piryaei
Ph.D., Geology Department, Exploration Division, NIOC, Tehran, Iran
author
Rudy
Swennen
Professor, Faculty of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium
author
Bizhan
Yousefi Yeganeh
Assistant Professor, Department of Geology, Faculty of Science, University of Lurestan, Khorramabad, Iran
author
Hassan
Soradeghi Sufiani
M.Sc., Geology Department, Exploration Division, NIOC, Tehran, Iran
author
text
article
2018
per
Middle-late Eocene Shahbazan Formation is exposed in the Lurestan area (Zagros region). The diagenetic features have been studied based on the data from five surface sections and four additional exploration wells. This investigation was carried out on the petrography of 700 thin sections, Cathodoluminescence on 40 thin polished samples, Scanning Electron Microscope on six samples and Electron Probe Micro-Analysis on 11 thin polished sections. the most conspicuous diagenetic processes affected on the Shahbazan Formation are dolomitization, cementation, neomorphism, physical and chemical compaction, dissolution and dedolomitization, of which dolomitization is the most important. Dolomite distribution in studied sections suggest that fluid flow was probably toward SW of studied area, since the extend of dolomitization waning in this direction. Since the dolomites of the Shahbazan Formation are overlain by the Asmari Formation, the dolomitization predates deposition of the Asmari Formation and occurred in eogenesis. Majority of calcite cements deposited before dolomitization in eogenesis, excluding parts of the blocky and poikiotopic calcite which may form in telogenetic and mesogenetic realms respectively. Degrading neomorphism occurred in marine realm. Part of dissolution occurred in meteoric vadose of eogenesis. Compaction commenced in meogenesis with increasing over burden due to deposition of the Shahbazan Formation and culminated after deposition of the Asmari and Gachsaran Formations. Telogentic processes caused dissolution and dedolomitization of the Shahbazan Formation due to exhumation. by the exception of dedolomitization and neomorphism, other diagenetic features are occurred in all studied sections.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
67
82
http://www.gsjournal.ir/article_68694_783627a6348a56dbfa1c31368ce8876e.pdf
dx.doi.org/10.22071/gsj.2017.89098.1151
Application of geostatistical studies for Identification of Au-Cu-Fe-W Anomalies in the Sehezar Valley of Tonekabon – Northern Iran.
Meysam
Yazdani
M. Sc., Department of Mining and Metallurgical Engineering, AmirKabir University of Technology, Tehran, Iran
author
Firouz
Alinia
Assistant Professor, Department of Mining and Metallurgical Engineering, AmirKabir University of Technology, Tehran, Iran
author
text
article
2018
per
Sehezar area is located in southern city of Tonokabon in Mazandaran province in north of Iran, and near the Tarom – Hashtjin belt. The existence of granitoid masses in the region can be important in terms of the potential of mineralization. The kriging geostatistical technique is used to predict the grade distribution, by using existing data and spatial correlation between them, which is described by the variogram. To identify the anomalous area, 50 stream sediment samples were collected from the area and analyzed by the ICP-MS method, and then interpreted. At first, the data were normalized and then the geostatistical analysis was used. Variogram studies showed that the spherical model is the best fitted model, and the spatial correlation range for the three elements of Au, Cu and Fe are approximately 350 m and for W is approximately 700 m. Finally, the estimation and estimation variance maps of the studied elements were prepared by using ordinary kriging geostatistical method with the spherical model on the GS+ software. Evaluating the results by calculating the root mean square error (RMSE) and calculating the mean absolute error (MAE) indicates the acceptable accuracy of variogram model. By studying the kriging estimation and kriging estimation variance maps, the anomal regions were introduced for the elements of Au, Cu, Fe and W in the case study. Due to the spatial correlation of the elements, it is concluded that this mass can be associated with iron-gold-copper deposits.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
83
96
http://www.gsjournal.ir/article_68700_cbc0a5cab67fff24794a4fa3b51db102.pdf
dx.doi.org/10.22071/gsj.2017.91602.1188
Geology, Mineralogy and fluid inclusion studies of the Abdossamadi barite deposit, northeast Marivand
Hossein Ali
Tajeddin
Assistant Professor, Department of Economic Geology, Faculty of Basic Science, Tarbiat Modares University, Tehran, Iran
author
S
Hassankhanlou
M.Sc. Department of Economic Geology, Faculty of Basic Science, Tarbiat Modares University, Tehran, Iran
author
Mohammad
Mohajjel
Associate Professor, Department of Structural Geology, Faculty of Basic Science, Tarbiat Modares University, Tehran, Iran
author
text
article
2018
per
Abdossamadi barite deposit is located 80 km northeast of the city of Marivan in the northwestern part of the Sanandaj–Sirjan metamorphic zone. The rocks in the deposit area predominantly consist of Cretaceous volcanosedimentary sequences of metamorphosed andesite, calcareous shale and limestone, metamorphosed under greenschist facies grade. The deposit is composed of stratiform ore and stringer zone. The stratiform ore consists of a lens-like barite body associated with sulfide minerals which are underlain by metamorphosed (and altered) andesite (stringer zone) and was under the calcareous shale. Sulfide mineral assemblages of the deposit are simple and consist of pyrite, sphalerite, galena, chalcopyrite, and tetrahedrite-tennantite. Massive, bedded, colloform, framboidal and disseminated structures and textures are common in the stratiform ore and indicate deposition of the deposit on the sea floor. The stringer zone that forming footwall of the stratiform ore is altered andesite that cut by sulfide-bearing quartz-barite veins and veinlets. Fluid inclusion studies indicated that barite samples in the stratiform ore homogenized between 115° and 215°C. Salinities of the fluid inclusions show a range from 0.21 to 5.86 wt.% NaCl equivalent. Cooling of the ore-bearing hydrothermal fluid is an important process in the stratiform ore deposition. This study shows that the barite deposit is an immature Kuroko type massive sulfide deposit, which contains only black ore. The deposit underwent metamorphism and deformation after the ore deposition and therefore, shows significant changes in ore structures and textures.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
97
108
http://www.gsjournal.ir/article_68685_9e69a4882a4bf925aa69e0dac6526a25.pdf
dx.doi.org/10.22071/gsj.2017.82349.1085
Effect of tectonic structures on karstic water resources exploration Using Fuzzy-AHP Logic, case study of Semnan province renge Bastam
R.
Akbari Jonosh
Ph.D. Student, Islamic Azad University, North Tehran Branch, Tehran, Iran
author
M.
Ghorashi
Associate Professor, Islamic Azad University, North Tehran Branch; Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
author
Hasan. A.
Babaei
Associate Professor, Georgia State University, Atlanta, United State
author
M.
Nakhaei
Associate Professor, Department of Geology, Faculty of Sciences, Kharazmi University, Karaj, Iran
author
M.
Pourkermani
Professor, Islamic Azad University, North Tehran Branch, Tehran, Iran
author
text
article
2018
per
Considering Iran’s situation in drought risk area, in this study karstic waters are investigated. The study area is located in central of Iran, Semnan province. Several factors are important in Karstification and formation water resources in carbonate, among them important are petrology, topography, climate, geomorphology and hydrogeology are pointed out. In this research, the role of structural factors in the development of karstic water resources in Semnan province has been studied. firstly, information layers of each factor prepared. For example, tectonic elements, includes maps: lineament density, faults length density, faults intersection density and density distance from faults making use geological maps and processing of satellite images. Information layers analyzed in the geographical information system (GIS), Expert Choice Software making use geostatistical methods. In this study, multi methods like analytic hierarchy process (AHP) and Fuzzy analytic hierarchy process (Fuzzy AHP) used in study of karstic water resources.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
109
120
http://www.gsjournal.ir/article_80038_858055a5509876392e5d5614cd5daf32.pdf
dx.doi.org/10.22071/gsj.2018.80038
Effects of Lithological Variation and Petrophysical Parameters on Oil Potential of the Ilam Reservoir (Upper Cretaceous), Ahvaz Oil Field, SW Iran
B
Soleimani
Professor, Department of Geology, Shahid Chamran University of Ahvaz, Ahvaz, Iran
author
M. S.
Ravanshad
M.Sc., Department of Geology, Shahid Chamran University of Ahvaz, Ahvaz, Iran
author
Ehsan
Larki
M.Sc., Well logging Section, National Iranian South Oil Company (NISOC), Ahvaz, Iran
author
text
article
2018
per
Petrophysical and lithological parameters study of Ilam reservoir in Ahvaz oil field is the main aim of the present research work. Ilam Formation consisted lithologically of limestone, dolomitic limestone, and less quantity of scattered shales. Facies changes are also observed through the formation. On the basis of petrophysical parameters distribution the reservoir divided into 4 zones. The results indicated that shale volume calculated by CGR log, as a shale index, is less than 10% and so the Ilam reservoir is clean formation. Shale quantity is low in zones 2 and 3 than zones 1 and 4. However, the shale volume is very less but its effect on petrophysical parameters especially porosity and permeability is intense. The Ilam Formation is estimated to have 26.8 % water saturation and 3.3% of irreducible water saturation. Middle part is characterized by low rate of water saturation compared to other parts and along with effective porosity average in the range of 14.7%. Calculated permeability average is 8.3 mD. Permeability variation is indicating a direct relation with the porosity. All these results are emphasized that the middle part (zones 2 and 3) is in better condition in view of oil potential and hydrocarbon reserve in comparing to other parts.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
121
132
http://www.gsjournal.ir/article_68682_911ed3315f01a1edd34947af62d64314.pdf
dx.doi.org/10.22071/gsj.2017.78637.1049
Geology, mineralization, mineralogy and genesis of Pirgheshlagh Cu-Zn-Pb deposit, NW Zanjan
Mahin
Zolfaghari
M.Sc. Student, Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
author
Ghasem
Nabatian
Assistant Professor, Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
author
Amir Morteza
AzimZadeh
Assistant Professor, Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
author
Maryam
Honarmand
Assistant Professor, Faculty of Earth Sciences, Institute for Advance Studies in Basic Sciences (IASBS), Zanjan, Iran
author
P.
Azizi
M.Sc., Angouran Mining Company, Zanjan, Iran
author
text
article
2018
per
Pirgheshlagh Cu-Zn-Pb deposit is located in the Central Iranian zone, north-east of the Mahneshan in the Zanjan province. The Kahar Formation with Precambrian age is the oldest Formation in the area which cutted by the granitic dykes. The Pirgheshlagh Cu-Zn-Pb mineralization occurred mainly as tabular-shape within the metamorphosed sandstones, meta-andesitic tuff, meta-crystal lithic tuff and meta-andesite rocks. Based on the field and microscopic studies, the main minerals consist of chalcopyrite, sphalerite, galena, pyrite, arsenopyrite and minor magnetite. The ore textures consist of disseminated, laminated, massive and veinlet which the veinlet texture is occurred mainly in the lower part of deposit. Secondary minerals such as smithsonite, cerrusite, chalcocite, covellite, malachite, azurite, goethite and lepidochrosite have formed during supergene processes. The main alterations in the Pirgheshlagh deposit include silicic, sericitic, chlorite and carbonate. The results of this study suggest that the Cu-Zn-Pb mineralization in the Pirgheshlagh deposit is a Besshi-type valcogenic massive sulfide (VMS) mineralization.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
133
148
http://www.gsjournal.ir/article_49525_6a67c3fea6aeda1ed6f5505f8ddf9189.pdf
dx.doi.org/10.22071/gsj.2017.77610.1037
Evaluation of TDR applications in engineering geological investigations -case study on Darian dam
S. M.
Fatemi Aghda
Professor, Department of applied Geology, Faculty of Geological Science, Kharazmi University, Tehran, Iran.
author
K.
GanjaliPour
PhD student, Department of applied Geology, Faculty of Geological Science, Kharazmi University, Tehran, Iran
author
K.
Nabiollahi
Assistant Professor, Department of Soil Science and Engineering, Faculty of Agricultural Science, University of Kurdistan, Sanandaj, Iran
author
text
article
2018
per
Due to the expansion and application of technology in soil and rock mechanics, engineering geology and geotechnics, it is possible to use newer, faster and cheaper methods in these fields every day. TDR technology is one of these methods. This technology has been developed by the telecommunication and electricity industry to determine the location of cable faults. The radar is a prime example of the TDR. The basis of this technology is the sending of a short pulse of energy (electromagnetic pulse) that is reflected in the collision with some anomalies. The point location of these anomalies can be determined if the velocity and direction of the pulse can be determined. The electromagnetic pulse reaches the waveguide through the conductor cable and enters the test environment. In this research, this method was used to determine the groundwater level in the Darian dam. The TDR has the ability to detect the air-water interface, and the reported results are consistent with the measured data using traditional methods. Also in one of the situations that are prone to slide, coaxial cable was installed as TDR sensor. The results showed that the TDR recognizes the shearing and stretching zones in the cable as the result of the ground movement successfully. Finally, since manual processing of TDR data was very difficult and requires high accuracy and time, a method for computer processing of this data was provided by the authors.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
149
160
http://www.gsjournal.ir/article_80134_befb7ff057faf2621cd02203e4d591e2.pdf
dx.doi.org/10.22071/gsj.2018.80134
Geology, Geochemistry and Tectonomagmatic of Some Volcanic Cones in Southeastern Iran
Habib
Biabangard
Assistsnt Professor, Department of Geology, University of Sistan and Baluchestan, Zahedan, Iran
author
Farzad
Molazadebravate
M.Sc. Student, Department of Geology, University of Sistan and Baluchestan, Zahedan, Iran
author
text
article
2018
per
Kuh-Som, KuhzaBozorg and KuhzaKochak volcanic cones are located in the southeastern of Bam and northwest of Bazman cites. From the perspective geology these cones are belong to the Iranian central zone and south-eastern edge of Lut block. These cones are composed of extrusive igneous rocks such as basalt, olivine basalt, andesite and basaltic andesite, and are predominant trachytic texture. Plagioclase, pyroxene and olivine are main minerals. Pyroclastic deposits, lapilli, tuff, ash and volcanic bombs, along with lava flows are main construction volcanic cones. These volcanoes are monogenitic and limited eruption. Based on type material that construction cone of the volcanoes, it seems they are among between Hawaii to Strambolian volcanoes. These rocks shows enrichment to LILE relative to HREE (Ce / Yb= 33-45) , high ratio Zr / Y (33.4), enrichment to LILE and negative anomaly from Ni, Cr and nearly Eu that reveals these rocks related to Calc-alkaline magmatism. In spider diagrams of trace elements and rare earth elements that normalized to Chondrites and primitive mantle show light rare earth elements enriched more than high rare earth elements and show pattern similar to affiliate subduction zones. Geochemical characteristics such as ratio of La / Yb 8/6 to 7/13, low Rb content with the tectonic setting discrimination diagrams indicate that they are related to subduction environments and low tendency to intapalate zone. Source of magma that formed these volcanoes resulted from melting of a garnet Lherzolite at depth of 100 to 110 Km. Tectonomagmatic diagrams shows these rocks dependence on of continental subduction environments to show slightly into the intraplate zone, so that it seems the volcanic cones of them related to the Makran and Oman subduction and related to Makran- Chaghy magmatic arc.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
161
174
http://www.gsjournal.ir/article_68690_77ac68ae8121d77961209821d4741a08.pdf
dx.doi.org/10.22071/gsj.2017.86320.1108
Geology, hydrothermal alteration and mineralization at Raziabad porphyry Cu deposit in the south of Kerman copper belt, southeastern Iran
Z.
Mohammadzadeh
Ph.D. Student, Department of Economic Geology, Tarbiat Modares University, Tehran, Iran
author
M.
Ghaderi
Professor, Department of Economic Geology, Tarbiat Modares University, Tehran, Iran
author
S.
Alirezaei
Associate Professor, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
author
J.
Hassanzadeh
Research Associate, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, U.S.A.
author
text
article
2018
per
The Raziabad porphyry copper deposit is located 30 km north of the city of Jiroft, in southeastern part of the Urumieh-Dokhtar magmatic arc, southeastern Iran. Several intrusive bodies including diorite, gabbro, granodiorite and quartz-diorite associated with groups of dikes with similar composition as well as dissimilar composition with the intrusions, intruded into the Raziabad porphyry system. The porphyry copper mineralization is associated with the granodiorite which intruded into dioritic, gabbroic and volcano-pyroclastic rocks. The magmatic activities continued after mineralization and lead to the emplacement of the quartz-diorite as well as intrusion of two groups of micro-granitic and andesi-basaltic dikes cutting the ore body, causing geometric complexity of the ore body. The alteration zones include potassic and magnetite-rich silicification zones, relatively restricted calcic zone, and propylitic zone. Phyllic alteration with restricted expansion and weak intensity overprinted on potassic alteration. The hypogene mineralization has occurred as disseminated, stockwork and veinlet styles closely associated with the potassic alteration zone. The main ore minerals are chalcopyrite+ magnetite+ pyrite with minor molybdenite, pyrrhotite, galena and sphalerite. The oxidation and enriched supergene zones are variable and restricted to the shallow levels. Hydrothermal activity in Raziabad deposit is classified into four stages on the basis of hydrothermal mineral assemblage and veinlet relation. The stages include: 1) calcium silicate-magnetite-quartz stage; 2) potassium silicate-sulfide-quartz-magnetite; 3) sericite-quartz-pyrite stage; 4) chlorite-epidote-calcite-pyrite±actinolite.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
175
186
http://www.gsjournal.ir/article_80135_40978fa8427282eacd06f60e37f6d5b3.pdf
dx.doi.org/10.22071/gsj.2018.80135
Performance of Chaos theory on natural systems in landslide hazard zonation in Fahlian river basin
H.
Baboli-moakher
Ph.D. Student, Department of Geography, University of Isfahan, Isfahan, Iran
author
K.
Shirani
Assistant Professor, Soil Conservation and Watershed Management Research Department, Isfahan Agricultural and Natural Resources,
author
A. R.
Taghian
Assistant Professor, Department of Geography, University of Isfahan, Isfahan, Iran
author
text
article
2018
per
Catchments are natural systems in which natural phenomena like landslides are considered as natural disasters. As a chaos factor, they have a main role in forming unstable condition, tackling energy, accelerating erosion and generating sediment. So factors causing slope instability are reaction of the system to positive feedback. This study aims to employ theory of natural system chaos, in the form of Shannon entropy index, to find the factors causing landslide and its hazard zonation in Fahlian basin. First, input layers including geology, rainfall, slope, aspect, land use, distance to river, distance to fault, and elevation were digitized using GIS techniques. Then occurred landslides were detected using satellite images and field study. Landslide hazard zonation based on defined weights of each parameter was generated. In order to run model and study its accuracy, receiver or relative operating characteristic (ROC), was used with 70 and 30 per cent of data as training and test, respectively. Results show that slope and aspect have the maximum effect on landslide occurrence with ultimate weight of 0.662 and 0.308, respectively. Landslide susceptibility zonation map show that more than half of study area (56.97 percent) have very high to high susceptibility. Disaggregation of areas with SCAI method show the high accuracy of the model in detection of area with average, low and very low susceptibility. Frequency ratio of hazard classes deals with high accordingly, area under curve (AUC) of ROC was estimated 0.87 with 0.026 standard deviation which is known as very good accuracy of model.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
187
200
http://www.gsjournal.ir/article_80136_0e4639327ebcb2d20bb0daeac8a46a75.pdf
dx.doi.org/10.22071/gsj.2018.80136
Geomorphic Signatures of Active Tectonics in the Ajichai Drainage Basin NW Iran
R.
Gholipour
Assistant Professor, Islamic Azad University (IAU), Science and Research Branch, Tehran, Iran
author
A.
Solgi
Assistant Professor, Islamic Azad University (IAU), Science and Research Branch, Tehran, Iran
author
Y.
Sattarzadeh-Ghadim
Assistant Professor, Islamic Azad University (IAU), Tabriz Branch, Tabriz, Iran
author
A.
Sorbi
Assistant Professor, Islamic Azad University (IAU), Karaj Branch, Karaj, Iran
author
text
article
2018
per
Geomorphic indices of active tectonics are useful tools to analyze of the active tectonics in a large area. These indices have the advantage of being calculate from the software and remote sensing packages over large area as a reconnaissance tool to identify geomorphic anomalies possibly related to active tectonics. This is particulary valuable in Ajichai basins where relatively little work on active tectonics based on this method was done, so this method is new and useful. Based upon valuable of the stream length-gradient index(SL), drainage basins asymmetry(Af), hypsometric integral (Hi), ratio of valley-floor width to valley height (Vf), drainage basins index shape (Bs), and index of mauntain front sinuosity (Smf), we used an overall index (Iat), that is a combination of the other indices that divides the landscape into four classes of relative tectonic activity. The moderate class of Iat is mainly in the class 2 (high), with 1045.46 Km2 ,11.26 percent, class 3 (moderate), with 2940.67 Km2 ,31.67 percent and with 5297.30 Km2 ,57.06 percent occupying of all zone. The stream network asymmetry (T) was also studied using morphometric measures of Transverse Topographic Symmetry. Analysis of the drainage basins and sub-basins in the study area results in a field of T-vectors that defines anomalous zone of the basins asymmetry. A comparison of T index clearly consist with the values and classes of active tectonics indices and the overall Iat index.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
201
210
http://www.gsjournal.ir/article_80137_a56cff7851c532cbb129c65dc81c16c7.pdf
dx.doi.org/10.22071/gsj.2018.80137
Evidence for Pan-African basement in Ghalghachi Leucogranite (west the Urmia Lake) with using U-Pb zircon dating and whole-rock Sm-Nd and Rb-Sr isotopic analyses
M.
Asadpour
Assistant Professor, Department of Geology, Faculty of Sciences, Urmia University, Urmia, Iran
author
S.
Heuss
Professor, Department for Earth and Environmental Sciences, LM-University, Muenchen, Germany
author
text
article
2018
per
The Ghalghachi leucogranite intrussion with approximately 2 Km2 is located in west Urmia Lake and 70 Km north of Urmia city. This intrussion in form of small stock has intruded into Precambrian metamorphic rocks including gneiss, schist and amphibolite. This area is part of the Sanandaj-Sirjan zone in northwestern of Iran. This is the first time that age of leucogranite was determined by LA-ICP-MS zircon grains 558.6 ± 3.8 Ma that indicates acidic magmatic activity and the presence of Pan-African basement similar to the central Iran. The presence of older cores in some of zircon grains with age between 900 to 2500 Ma suggest the presence of older rocks in the study area. The rock show negative initial eNd (t) values of -4.3 with TDM 1.61 that are consistent with partial melting of a primary crust (with Paleoprotrozoic age) that was formed during the Neoproterozoic the same as Arabian Shield. The 87Sr/86Sr and εNd of whole rock and Th/U values in zircons show the involvement of more crustal and less mantle components, during the opening of Paleotethys Ocean.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
211
220
http://www.gsjournal.ir/article_80138_ae78bbe636e3584a073519860d5e9117.pdf
dx.doi.org/10.22071/gsj.2018.80138
Improvement of geotechnical properties of CL soil by kaolinite nanoparticles
M.
Majdi
Ph.D. Student, Department of Engineering Geology, Tarbiat Modares University, Tehran, Iran
author
A.
Uromiehi
Professor, Department of Engineering Geology, Tarbiat Modares University, Tehran, Iran
author
M. R.
Nikudel
Assistant Professor, Department of Engineering Geology, Tarbiat Modares University, Tehran, Iran
author
text
article
2018
per
In this study, the effect of nanokaolinite particles on geotechnical properties of clayey soils is investigated. The mechanical method of Planetary Ball Mill was used for production of nanoparticles. For this, initial kaolinite powders was milled in Planetary Ball Mill for 10 hours with speed of 500 Rpm of machine. Output powder was in nanometer scale that images produced from FESEM verified this. Then, nanoparticles were mixed with clayey soil (CL) in different weight ratio of dry soil and change percentage of geotechnical properties of treated soils was investigated by compaction, direct shear and cassagrande tests and optimum percentage of added nanokaolinite was determined. Results showed that LL and PL of soil increased while percentage of added nanoparticles increased but since increasing of PL is larger than LL, thus PI is decreased that it is favour for geotechnical engineering for construction. Also with attention to results of compaction tests, density of clayey soil was increased with adding of nanoparticles to an optimum quantity and after it decreased. It is determined from direct shear tests that cohesion of clayey soils increased with adding of nanoparticles to optimum quantity and after it is changeless approximately. Results of XRD and XRF tests showed that chemical integition of nanoparticles produced from planetary ball mill is similar to initial powder and not change.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
221
228
http://www.gsjournal.ir/article_80139_aec9ae2d02ad6ae9c79d444c42c073b9.pdf
dx.doi.org/10.22071/gsj.2018.80139
Systematic Paleontology of Alveolinids in the red continental - clastic Hormak formation, South Eastern of Iran, North of Zahedan, Hormak Section
Reza
Moezzi nasab
M.Sc., Department of Geology, University of Sistan and Baluchestan, Zahedan, Iran
author
Mohammad Nabi
Gorgij
Associate Professor, Department of Geology, University of Sistan and Baluchestan, Zahedan, Iran
author
Mohammad Reza
Bakhshi mohebbi
Assistant Professor, Department of Geology, University of Sistan and Baluchestan, Zahedan, Iran
author
text
article
2018
per
Hormak Section consist of alternation of Oligomictic conglomerate with mainly Alveolinids and Nummulitid bearing calcareous pebbles and afew andesits, basalt and rhyolitic tuff pebbles, Pebbly Sandstone and red shale. The Sourse of red continental - clastic Hormak formation conglomerate probably was Debil formation and Equvaleut Late Paleocene – Early Eocene deposits. Approxmalty 80% of Debil formation foraminifer contents very resemble to that are identified in the Hormak Section conglomerate. In the studied area based on identified species such as A.canavarii, A.elliptica nuttalli, A.pasticillata, A.decipiens, A.fornasinii, A.globula, A.solida Early Eocene age are suggested.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
229
236
http://www.gsjournal.ir/article_50548_10eb95c5cfb3ae19529c04acb35dd3a7.pdf
dx.doi.org/10.22071/gsj.2017.81959.1084
Investigation on the genesis of the iron oxide- apatite ± REE deposits of the Bafgh-Saghand district (Central Iran), based on oxygen isotope studies
S. A.
Majidi
Ph.D., Department of Geology, Islamic Azad University, Science and Research Branch, Tehran, Iran
author
M.
Lotfi
Associate Professor, Department of Geology, Islamic Azad University, North Tehran Branch, Tehran, Iran
author
M. H.
Emami
Associate Professor, Department of Geology, Islamic Azad University, Islamshahr Branch, Tehran, Iran
author
N.
Nezafati
Assistant Professor, Department of Geology, Islamic Azad University, Science and Research Branch, Tehran, Iran
author
text
article
2018
per
The metallogenic zone of Bafgh-Saghand in central Iran hosts huge low-titanium iron oxide-apatite (IOA) deposits (also called Kiruna type iron deposits) with more than 1500 Million tons grading 55% iron. The genesis of these deposits including Chadormalu, Choghart, She-Chahun, and Esfordi has long been a subject of debate. In this regard, several hypotheses such as magmatic, hydrothermal, carbonatititc, BIF, and sedimentary-exhalative have been proposed so far. In this study, 20samples of the magnetite ore from the deposits of Chadormalu, Choghart, She-Chahun, and Esfordi were selected and analyzed for their oxygen isotope values. Based on the analyses results, the variations of δ18O values in the deposits are meaningful and result from the characteristics of the ore forming processes involved. The δ18O values of the analyzed magnetite samples range from -0.1 to +2.2‰ and indicate the role of both orthomagmatic (>0.9‰) and hydrothermal (<0.9‰) processes in the formation of these deposits. On the other hand, the values lower than +0.3‰ can be attributed to secondary oxidation or hydrothermal processes and/or a combination of both. The oxygen isotope data of the investigated samples are identical to the deposits such as El Laco of Chile, Kiruna and Grängesberg of Sweden, and Zhibo and Chagangnuoer of China with a magmatic-hydrothermal genesis. According to the geological and analytical evidence obtained from the iron oxide-apatite deposits of the Bafgh-Saghand area, first a tonalite-trondhjemite-granodiorite, diorite, and granite magmatism related to a continental margin subduction at 533 to 525Ma has caused a magmatic mineralization of iron in the area, while a later hydrothermal process related to an alkaline intrusion (syenite and monzosyentie) has caused a hydrothermal mineralization. Therefore a magmatic-hydrothermal source can be suggested for the formation of the low-titanium iron oxide-apatite deposits of the Bafgh-Saghand area.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
237
244
http://www.gsjournal.ir/article_80142_1c83ca5de99ea7e144003452d23a577d.pdf
dx.doi.org/10.22071/gsj.2018.80142
Geometric- kinematic analysis of the Kalmard fault zone, north of Ozbak-Kuh, central Iran
Mohammad
Moumeni Taromsari
M.Sc., Faculty of Earth Science, Kharazmi University, Tehran, Iran
author
Maryam
Dehbozorgi
Assistant Professor, Faculty of Earth Science, Kharazmi University, Tehran, Iran
author
Reaza
Nozaem
Assistant Professor, School of Geology, College of Science, University of Tehran, Tehran, Iran
author
Ali
Yassaghi
Associate Professor, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran
author
text
article
2018
per
Kalmard fault is considered as one of the fundamental faults in central Iran zone. The Ozbak Kuh mountains with a NE-SW strike are located in central Iran in the Kalmard fault zone. Hence, analyze the folds and faults in this deformed zone can aid in the understanding of structural evolution of this area in central Iran. In this study, field operations and geometric-kinematic analysis of folds and faults, also study of their structural evolution are integrated in order to provide a better understanding of the structural evolution of the Ozbak Kuh area. The results display that before Cretaceous period the Ozbak-Kuh area was influenced by a compressional regime with a prependicular trend with respect to the Kalmrad fault that it caused the formation of folds and faults paralell to folds axial plane trends, after that compressional regime changing to a dextral strike slip regime in Cenozoic in direction of NE- SW, all structures in the study area such as, faults, folds axial plain and other related structures were influenced by the aforementioned strike slip stress. Generally the geometric- kinematic pattern of faults in the study area regarding to the major and R, P, R', and X faults is kind of simple shear and contraction parallel to deformed zone. In this pattern the simple shear is dominant and compression is trivial component. The mechanism of the faults in the study area shows that the deformation of the Ozbak Kuh mountains is toward the final stages of simple shear. The multiple steps of deformation, simple shear movements and intensity of deformation in the study area caused that the strike of all structures is to be in direction of NE-SW that it is parallel to the main fault zone.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
245
254
http://www.gsjournal.ir/article_49927_2f0c899dfc3a0c9e20745f6d626a6063.pdf
dx.doi.org/10.22071/gsj.2017.80071.1066
The evolution of bubble size distributions (BSD) in Qorveh-Bijar Quaternary volcanism, East of Kurdistan
Rahimzadeh
Bahman
Assistant Professor, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
author
text
article
2018
per
Scoria cones are one of the main parts of East of Kurdistan volcanoes. Olivine, Pyroxene, Plagioclase and Biotite are main phonocrystals with Amygdaloidal-glassy matrix. This paper was studied processes of bubbles nucleation and grow during the eruption of scoria's unite using the Bubble Size Distribution (BSD) method including study of population density, bubbles volume, 3D modeling, nucleation and bubble growth. For selected sample from different cone, in total was measured 3623 bubbles and drawn that bubbles volumes calculated from 40 to 85 percent. Using the 2D bubbles shape renovated 3D bubbles schematic shape and compared together. Most population for four samples bubbles shapes are near to sphere and for other four samples are ellipsoid. Longest ellipsoid bubbles shape has 1:3.2:8 diagonals ratio that it’s flat ellipsoid. The longest diameter (L) is perpendicular to the surface and parallel to lower pressure dictated on magma and bubbles could be growth more than other sides. Presence of 2-5 peaks in frequency distribution versus bubble size diagram, suggesting unimodal, polymodal, exponential and power low events for bubbles generation in the east of Kurdistan Scoria's. Nucleation density increased from first to lasts generation but bubbles growth reduced. Recur of bubble forming in macroscopic samples, microscopy, SEM and nucleation and grow model suggested fractal model.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
255
264
http://www.gsjournal.ir/article_68692_9f20be08c32405540b1e829c3a1cf2f2.pdf
dx.doi.org/10.22071/gsj.2017.87653.1129
Imaging karst aquifers by combining deep electrical resistivity tomography with magnetic surveys, a case study of the Quchan area, NE Iran
Ali
Ramzani
Ph.D. Student, Department of Geophysics, Islamic Azad University, Science and Research Branch, Tehran, Iran
author
Mir Sattar
Meshinchi Asl
Assistant Professor, Department of Geophysics, Islamic Azad University, Science and Research Branch, Tehran, Iran
author
Mohsen
Oveisy Moakhar
Assistant Professor, Department of Geophysics, Razi University, Kermanshah, Iran
author
text
article
2018
per
Geophysical surveys have been carried out to characterize the structure and to better understand the karstic water reservoirs in the Quchan area. Deep 2-D resistivity tomography and magnetic method have been used to detect the most promising zones for new water-well siting. Magnetic method has a common usage in the interpretation of the tectonic framework, faults and fractures that are triggering parameters of karstification phenomena. Therefore a high resolution magnetic survey was carried out as the first detection approach at selected sites in the studied region with the aim of probable buried fault exploration for karstic zone detection. The geomagnetic results detect magnetic anomalies in NW-SE direction agreed with the known faults system in the area. As the second approach, a Deep Electrical Resistivity Tomography (DERT) process has been designed according to magnetic results. Tree sections of 2-D electrical tomography using the Wenner-Schlumberger array has been carried out along a survey line of 100 m and an investigation depth of about 250 m with resolution of 5 m. The 2-D inversion modeling provides suitable information about the exploration targets and essential geological formations. The studies illustrate that low resistivity areas on the sections related to karstic zones. We used this combination of geophysical methods in this study to prove that these geological phenomena can be detected by such quick, economic and confident sequence of geophysical methods.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
265
272
http://www.gsjournal.ir/article_68688_e614930d6f2ab3a8f7090c347b8dc26f.pdf
dx.doi.org/10.22071/gsj.2017.86124.1106
Frontal Fars Paleo-High evolution history, SE Zagros fold-and-thrust belt
Ali
Taghavy
M.Sc., Department of Earth Sciences, Institute for Advanced Studies in Basic Science (IASBS), Zanjan, Iran
author
Mahdi
Najafi
Assistant Professor, Department of Earth Sciences, Institute for Advanced Studies in Basic Science (IASBS) , Zanjan, Iran
author
Najmeh
Etemad-Saeed
Assistant Professor, Department of Earth Sciences, Institute for Advanced Studies in Basic Science (IASBS) , Zanjan, Iran
author
Mohammad
Seddigh
M.Sc., Iranian Central Oil Fields Company (ICOFC), Tehran, Iran
author
text
article
2018
per
A synthesis of 2-D seismic interpretation, exploration well data and field survey permit us to decipher the structural evolution history in the front of Fars paleo-high area, located in SE Zagros fold-and-thrust belt. In the current study, a structural evolution model is proposed for the region, according to a sequential restoration, which was performed based on the growth stratal unit’s pattern, together with constant length and area assumptions. The result of the sequential restoration indicated that in the late Eocene time, Tanbak anticline incepted on the hangingwall of the inverted mountain front basement fault, as an out of sequence forced fold. Although, thin-skinned detachment folding initiated in the lower Miocene, shortening and amplification of anticlines did not accelarated until the late Miocene time, when thrust faults formed on the limb of growing anticlines while Dashtak middle detachment thickened in the fold crestal areas, likely due to an intensified regional shortening.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
273
284
http://www.gsjournal.ir/article_68695_21798c2149367a89dd56e8b1e0b81379.pdf
dx.doi.org/10.22071/gsj.2017.89264.1158
Evaluation of impact processes in the formation of Neshveh volcanic rocks, NW Saveh
Mehdi
Rezaei-Kahkhaei
Assistant Professor, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
author
Dariush
Esmaeily
Professor, School of Geology, College of Science, Tehran University, Tehran, Iran
author
Hanieh
Sahraei
M.Sc., Iran Minerals Production and Supply Company (IMPASCO), Tehran, Iran
author
text
article
2018
per
Neshveh volcanic rocks located in the NW Saveh are parts of the Uromeyeh-Dokhtar magmatic arc. The rocks are mainly basalt, basaltic andesite, andesite and trachyandesite in composition. Petrographical studies represent some evidences for the lack of equilibrium between crystals and magma, such as sieve texture, two generation of fresh and altered plagioclase, reaction rim, corrosion and rounding of phenocrysts. Major and trace element diagrams show, although crystal differentiation was effective in the evolution of the study rocks, the scatter and unusual trends, which are observed in some diagrams in comparing with fractionation trend, reflect magma mixing and contamination were also important during magma generation. Inconsonance and high variations in Sr concentrations together with binary diagrams of Nb/Y-Nb and Rb-Zr/Rb reveal magma mixing role in the evolution of Neshveh volcanic rocks. Considering the above facts, we can conclude that magma mixing and magmatic differentiation were the important processes in formation of the Neshveh volcanic rocks. As well as, the incorporation of new magmatic pulse(s) with differentiation magma is the most effective mechanism for the evolution of volcanic rocks from the study area.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
285
294
http://www.gsjournal.ir/article_68698_f14c9f566d217890fa8a0b61520ab4ed.pdf
dx.doi.org/10.22071/gsj.2017.91461.1190
Lithofacies and sedimentary environment of Qadir member of the Nayband Formation on Parvadeh Coal Mines region, east central Iran
Ehsan
Zamaniyan
M.Sc. Student, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
author
Mohammad
Khanehbad
Assistant Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
author
Reza
Mossavi-Harami
Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
author
Asadollah
Mahboubi
Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
author
text
article
2018
per
Qadir Member of Nayband Formation in the eastern part of central Iran have a wide outcrop. Investigating the lithofacies and sedimentary environment of Qadir Member of Nayband Formation (Upper Triassic) in east central Iran, Tabas Block, resulted in identifying the coastal plain, deltaic and open marine deposits. Based onfield evidences, the facies features and the geometry of beds, this member consists of two lithofacies include carbonate and siliciclastic facies. The siliciclastic facies were identified as having four sandstone facies (medium-grained), including Sr, Sh, Sp, St and three fine-grained lithofacies, including FI, Fm, Fl (Sr) / Sr (FI) and one coal facies (C). Also carbonate facies are calcirudite and calcarenite. Regarding the field, laboratory studies and identifying the lithofacies, the coastal plain, deltaic (including deltaic plain, proximal delta front, distal delta front, and prodelta) and open marine environments were identified for Qadir Member on which it is under the impact of tidal currents.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
295
304
http://www.gsjournal.ir/article_68697_81dc25375b4c35626da71cb8604fab22.pdf
dx.doi.org/10.22071/gsj.2017.91282.1184
Lithogeochemistry and magmatic evolution of mineralized-hosted igneous rocks in the mineral occurrences of northern Kabudan, Taknar complex
E.
Tale Fazel
Assistant Professor, Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
author
text
article
2018
per
The polymetallic Fe (±Base metal, Ag and Au) of northern Kabudan (eastern of Sarborj village), occurs within breccia-porphyry rhyolite and pelitic-schist of the Taknar Formation. Based on field evidence, three rock units including: fine-grain rhyolite (footwall), porphyritic rhyolite (ore horizon) and late granitoid-andesitic rocks (hangingwall), are recognized in this area. Lithogeochemical signatures reveal that the fine-grain rhyolite of lower horizon with sub-alkaline geochemical signatures of (Nb/Y<0.7), low Zr/TiO2 (608-930) and Zr/Sc (13.3-36.3) is successive replaced by ore-bearing porphyritic rhyolite with alkaline (Nb/Y>0.7), slightly higher values of Zr/TiO2 (380-1116) and Zr/Sc (22.5-116). Are thought to be the magma thermal control and partial melting of rhyolite in high temperature can be increasing HFSE/compatible element ratio (e.g., Zr/TiO2 and Zr/Sc) and eventually metal occurrence in porphyritic rhyolite are interpreted to have been concentration of ore minerals. Finally, the polymetallic mineralization in northern Kabudan, adjacent to lower rhyolitic unit and ore horizon is probably occurs as a result of lithogeochemical evolution of porphyritic rhyolite felsic rocks.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
305
318
http://www.gsjournal.ir/article_80144_aa4e9bf90d4f3cbd060e3756a6ac6103.pdf
dx.doi.org/10.22071/gsj.2018.80144
Palynology of the Bazyab Formation at the Bazyab stratigraphic section, Central Iran
Mohammad
Sharifi
Ph.D. Student, Department of Geology, College of Science, University of Tehran, Tehran, Iran
author
Ebrahim
Ghasemi-Nejad
Department of Geology, University College of Science, University of Tehran,‎ Tehran
author
M.
Akhtari
M. Sc., Exploration Directorate, National Iranian Oil Company, Tehran, Iran
author
Mehdi
Sarfi
Ph.D., Faculty of Earth Sciences, Damghan University, Damghan, Iran
author
Mohsen
Yazdi-Moghadam
Ph.D. Student, Exploration Directorate, National Iranian Oil Company, Tehran, Iran
author
text
article
2018
per
The Bazyab Formation is one of the Cretaceous rock units in the Khor and Byabanak area. In this study we investigated palynological content of the Bazyab Formation at the Bazyab stratigraphic section where it is up to 1067 meters thick and consists of marlstones, shales, sandstones, limestones and sandy limestones, claystone, shale and interlayers of limestone. The formation at this section is confined conformably between Shah-Kuh Formation at the base and Debarsu Formation at the top. A total of 40 rock samples have been collected from the formation and investigated for their palynological contents. The obtained palynological data resulted in detection of twenty-nine genera and54 species of marine dinocysts alongside with 20 genera and 29 species of terrestrial palynomorphs (spores and pollens). An age of Aptian –Albian is constrained for the formation in this section on the evidence of recorded palynomorphs. Based on high frequencyof inner neritic dinocysts, planktonic foraminifers and mudstone and wackestone facies of the carbonate beds, an inner shelf sedimentary environment was suggested as the depositional environment of the Bazyab Formation.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
319
326
http://www.gsjournal.ir/article_68699_e822514fbd31dbe68e875ced11e52f05.pdf
dx.doi.org/10.22071/gsj.2017.91471.1187
Mineralogy and determination of thermodynamic conditions at Javinan Skarn, South of Kashan
S. M.
Tabatabaei Manesh
Associate Professor, Department of Geology, Faculty of Science, University of Isfahan, Isfahan, Iran
author
M. A.
Mackizadeh
Assisstant Professor, Department of Geology, University of Isfahan, Isfahan, Iran
author
saeideh
ranjbar
Ph. D., Department of Geology, University of Isfahan, Isfahan, Iran
author
R.
Gholinezhad
M.Sc., Department of Geology, University of Isfahan, Isfahan, Iran
author
text
article
2018
per
Javinan skarn is located at 115 km north west of Isfahan (40 km south of Kashan and east of Ghohrud), is included in Central Iran structural zone and spread in contact with Ghohrud granitoid (Middle Miocene age) with shale, sandstone and limestone succession of the Jurassic age known as Shemshak Formation. Skarnification is made up of endo- and exoskarn subzones. Wide mineralization in these skarns hasn’t observed. Endoskarn subzone has limited occurence (from a few millimeters to a few centimeters) and exoskarn has the greatest development (from 1 meter to more than 10 meters). Endoskarn with the formation of the skarn minerals garnet, pyroxene, plagioclase, epidote and sphene, is formed in the intrusive host rock and is in the vicinity of the carbonate part. In its immediate neighborhood, exoskarn subzone starts with the formation of minerals garnet, pyroxene, idocrase, epidote, phlogopite, chlorite, quartz and calcite in the carbonate section. Mineralogical studies and textural relationship of minerals have shown that the metamorphic facies اhas reached to pyroxene hornfels in skarn rocks of this area.
Scientific Quarterly Journal of Geosciences
Geological Survey of Iran
1023-7429
28
v.
109
no.
2018
327
338
http://www.gsjournal.ir/article_79551_cbedba1c7e4cdbecbc59a36bcc873c9d.pdf
dx.doi.org/10.22071/gsj.2017.72014.1008