مقاله پژوهشی
2. Geologic and geochemical investigation on the Mn veins in Jonub-E Sehchangi, SW Birjand, Southern Khorasan province (east Iran)

Behnaz Barghi؛ Ali Asghar Calagari؛ Mohammad Hossein Zarrinkoub؛ Vartan Simmonds

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 3-12

http://dx.doi.org/10.22071/gsj.2018.58346

چکیده
  Mn-bearing veins of Jonub -ESehchangi are located 200 km southwest of Birjand, Southern Khorasan province (east of Iran). These veins are hosted by andesitic rocks of Eocene to Oligocene ages. Ore minerals identified  by XRD method and mineralographic studies and are Pyrolusite, cryptomelane, psilomelane, hollandite, hematite and goethite, displaying colloform and open-space filling textures. Gypsum, halite, barite, carbonate and silica are the gangue minerals. Alteration zones, specifically argillic alteration zone, are developed along the vein within the andesitic wall rocks. Based on the ...  بیشتر

مقاله پژوهشی
3. Hydrogeochemical investigation and water quality assessment in the sarough watershed, Takab mining district

Parisa Piroozfar؛ Samad Alipour؛ Soroush Modabberi؛ David Cohen

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 13-28

http://dx.doi.org/10.22071/gsj.2018.58350

چکیده
  This study investigated the hydrogeochemistry and environmental water quality of rivers in Sarough watershed using the major ion chemistry and explored multivariate statistical methods for identification of processes which release the solutes in natural waters. Totally, 38 samples were collected along the main streams of the watershed. The mean concentrations of major cations (Na, K, Mg, Ca) and anions (Cl, NO3, CO3, HCO3, SO4) were measured about 15, 4.6, 10.5, 61, 30, 4.49, 89, 156 and 107 mg/l, respectively. The results indicated that the river waters in the Sarough watershed were neutral and ...  بیشتر

مقاله پژوهشی
4. Tectonosedimentary evolution of the basins in Central Alborz, Iran

Mohammad Reza Sheikholeslami

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 29-38

http://dx.doi.org/10.22071/gsj.2018.58353

چکیده
  Evidence of at least ten different tectonic- controlled sedimentary basins can be recognized in the central part of the Alborz Mountains in the Middle part of the Alpine-Himalayan belt. They formed from Neoprotrozoic to recent time as the results of the relative plate motion in southwest of Asia in Tethyan realm. The basins include: (1) Prototethys Late Neo-Proterozoic to Early Ordovician epi-continental/platform basin; (2 Paleotethys Middle Ordovician to Devonian rift basin; (3) Devonian to Middle Triassic continental shelf basin; (4) Upper Triassic to Lower Jurassic foreland basin; (5) Shemshak ...  بیشتر

مقاله پژوهشی
5. Rock mass structural characterization via short-range digital photogrammetry

Mohammad Masoud Samieinejad؛ Navid Hosseini Alaee؛ Kaveh Ahangari

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 39-44

http://dx.doi.org/10.22071/gsj.2018.58357

چکیده
  Because of the important role of rock mass structural properties on its mechanical behavior, determining the qualitative and quantitative properties of has been a subject of intense research. In this regard, numerous techniques such as scanline surveying, cell mapping, and geologic structure mapping have been proposed. However, applying such field surveying techniques for rock mass properties involves spending substantial costs and times and high risks. Besides, due to the errors induced by operations, measurements, systematic errors, etc., the results of these techniques are not accurate and precise ...  بیشتر

مقاله پژوهشی
6. Microfacies analysis and depositional environment of the Fahliyan Formation (Lower Cretaceus), Abadan plain, West South of Iran (Arvand-field)

Abbas Dehkar؛ Vali Ahmad Sajjadian؛ Mohammad Reza Noora؛ Kazem Shabani Goorji

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 45-52

http://dx.doi.org/10.22071/gsj.2018.58359

چکیده
  The Fahliyan Formation of Khami Group is hosting important hydrocarbon reserves in Iran and also is a main reservoir rock in the Abadan Plain oil fields which is Neocomian in age. In the studied wells its thickness is about 406 meters. In the Abadan Plain, the Fahliyan Formation transitionally overlies of the Garau Formation and its upper boundary changes into the Gadvan Formation. According to thin sections examinations prepared from cores analysis 11 microfacies is recognized by various facies including dolostone and dolomudstone of tidal flat, skeletal wackestone to packstone of the open and ...  بیشتر

مقاله پژوهشی
7. In-situ stress regime in the Asmari reservoir of the Zeloi and Lali oil fields, northwest of the Dezful embayment in Zagros fold-thrust belt, Iran

Hossein Talebi؛ Seyed Ahmad Alavi؛ Shahram Sherkati؛ Mohammad Reza Ghassemi؛ Alireza Golalzadeh

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 53-68

http://dx.doi.org/10.22071/gsj.2018.58362

چکیده
  This paper analyzes in-situ stress field in the Asmari formation with in the complex structures of the Zeloi and Lali oilfields located in the Dezful embayment, SW Iran. The orientation of the maximum horizontal stress, SHmax is determined on the basis of compressive borehole breakouts and drilling-induced tensile fractures observed in eight oil wells, in which we focus on well-log based methods and drilling data to estimate stress magnitudes. In situ stress magnitude in studied fields obtained from 1D mechanical earth modeling in key wells. The maximum horizontal stress trend in this area is NE–SW ...  بیشتر

مقاله پژوهشی
8. Pervasive white and colored noise removing from magnetotelluric time series

Hanieh Mardomi؛ Mir Sattar Meshinchi Asl؛ Hamid Reza Siahkoohi

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 69-74

http://dx.doi.org/10.22071/gsj.2018.58363

چکیده
  Magnetotellurics is an exploration method which is based on measurement of natural electric and magnetic fields of the Earth and is increasingly used in geological applications, petroleum industry, geothermal sources detection and crust and lithosphere studies. In this work, discrete wavelet transform of magnetotelluric signals was performed. Discrete wavelet transform decomposes signals into coefficients in multi-scales. Noise and signal portions are separable in multi-scale mode. Therefore, noise can be discarded in each scale; a threshold value is constructed dependent to coefficients of the ...  بیشتر

مقاله پژوهشی
9. Predicting land subsidence rate due to groundwater exploitation in the district 19 of Tehran using MODFLOW and InSAR

Mojtaba Arjomandi؛ Ali Saremi؛ Amir Pouya Sarraf؛ Hossien Sedghi؛ Mahasa Roustaei

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 75-82

http://dx.doi.org/10.22071/gsj.2018.58364

چکیده
  During recent years, groundwater exploitation and thereby decreasing hydraulic head in the compressible sedimentary aquifer which is placed in the district 19 of Tehran have been caused noticeable land subsidence. The land subsidence has been damaging the infrastructures which have been being built in the south of Tehran Basin, especially in the district 19 of Tehran. A finite-difference groundwater flow model (MODFLOW) and a synthetic aperture radar (SAR) method have been used to estimate and predict the rate of land subsidence in this area, and help hydrogeologists manage the vital groundwater ...  بیشتر

مقاله پژوهشی
10. Agricultural crop growth modelling: a tool for dealing with the threat of climate change affecting food security (case study for greenhouse tomato)

Mohammad Bagher Lak؛ Saeid Minaei؛ Saeid Soufizadeh؛ Ahmad Banakar

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 83-90

http://dx.doi.org/10.22071/gsj.2018.58365

چکیده
  Climate change and essentiality of the food security have motived scientists to try innovative approaches, among which, crop growth models can help to predict crop yield. In order to simulate tomato (Solanum lycopersicum) growth, phenological characteristics of a short-life variety of tomato were assessed. Phenologic characteristics included leaf area index (LAI), specific leaf area (SLA), crop height (H), leaf fresh and dry weight (LFW and LDW), and stem fresh and dry weight (SFW and SDW). These parameters were measured at four different times (i.e. 33, 45, 55, and 87 days after planting) during ...  بیشتر

مقاله پژوهشی
11. Middle Jurassic biostratigraphy of plant macro and microfossils in Soltanieh Mountains, south of Zanjan, NW Iran

Fatemeh Vaez-Javadi؛ Nasrollah Abbassi

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 91-102

http://dx.doi.org/10.22071/gsj.2018.58367

چکیده
  Jurassic deposits a section in south of Zanjan contain various taxa of macro and microfloras. Six plant macrofossil species belonging to five genera of various orders such as Equisetales, Cycadales, Bennettitales, and Pinales (Coniferales) are identified. This section contains seventeen species of palynomorphs in which six spore species allocated to six genera, eight pollen species allocated to five genera, and three dinocyst species allocated to two genera are present. Based on the occurrence of Index fossils such as Ptilophyllum harrisianum, Nilssonia sp. cf. N. bozorga, and Equisetites sp. cf. ...  بیشتر

مقاله پژوهشی
12. Impact of structural geology on integrated water resources modeling improvement; a case study of Garesoo river basin, in Doab-Merek station, Kermanshah, Iran

Masood Fotovat؛ Jahangir Porhemmat؛ Hossein Sedghi؛ Hossein Bababzadeh

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 103-110

http://dx.doi.org/10.22071/gsj.2018.58368

چکیده
  Garesoo river basin in Doab-Merek, as studying area of this research, located in northwest of Kermanshah province in west part of Iran. There is long-term hydro climatologic data in this basin about rainfall, temperature, etc. (more than 50 years) and main river data (about 35 years). Due to intense fall down groundwater level and seasonal river drying, in the past 10 years .It was necessary that studies be done to the management water resources of region. Studies performed at first by linking MODFLOW to WEAP model with information and initial understanding of the geology and the others information ...  بیشتر

مقاله پژوهشی
13. Determination of relationship between silver and lead mineralization based on fractal modeling in Mehdiabad Zn-Pb-Ag deposit, Central Iran

Gholamreza Hashemi Marand؛ Mohammadreza Jafari؛ Peyman Afzal؛ Ahmad Khakzad

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 111-118

http://dx.doi.org/10.22071/gsj.2018.58371

چکیده
  Main aim of this study is to determine relationship between lead and silver mineralized zones using the Concentration-Volume (C-V) fractal modeling and logratio matrix based on subsurface data in Mehdiabad Zn-Pb-Ag deposit, central Iran. First, Pb and Ag raw data were analyzed by statistical processes and their histogram have similar shape. Next, Geostatistical modeling was carried out for the Pb and Ag data and their distributions were estimated by ordinary kriging. Then, the C-V log-log plots were created for the Pb and Ag which show five populations as mineralized zones for both of them. Moreover, ...  بیشتر

مقاله پژوهشی
14. Mineralogy and geochemistry of Nodoushan Zn-Pb deposit: A transitional deposit in UDMA, Central Iran

Kamran Motevali؛ Mehrdad Behzadi؛ Mohammad Yazdi

دوره 27، Special Journal-106 ، زمستان 1396، صفحه 119-130

http://dx.doi.org/10.22071/gsj.2018.58372

چکیده
  Eocene magmatism with intermediate-acid tuffs and volcanic rocks, the host to the Nodoushan deposit in Yazd province, intruded by Oligocene early diorite and later granite plutonic rocks. The former involved in iron skarn (containing epidote and euhedral grossularite) to the north and northern part of the deposit, the latter contributed to fault-controlled Zn-Pb deposit. The structural features controlled both the mineralization and consequent alterations which ranged from silicification (central) to argillic (northern). Propylitic alteration and dolomitization considered the minor ones, the iron ...  بیشتر