Scientific Quarterly Journal of Geosciences

Economic Geology

Geology, mineralization, alteration and fluid inclusion studies of the Janja porphyry Cu-Mo deposit, Sistan Suture Zone, SE Iran

Nima Rahimi; Shojaeddin Niroomand; Mohammad Lotfi; Mojtaba Rahimi Shahid

Volume 32, Issue 3 , September 2022, , Pages 13-30

https://doi.org/10.22071/gsj.2022.274408.1889

Abstract

The Janja Cu-Mo porphyry deposit is located at 70 km south of the Nehbandan, Sistan suture zone, Eastern Iran. The porphyry mineralization in the Janja deposit is temporally and spatially associated with the diorite to quartz diorite and granodiorite granular to porphyry stocks that intruded in the Cretaceous ... Read More The Janja Cu-Mo porphyry deposit is located at 70 km south of the Nehbandan, Sistan suture zone, Eastern Iran. The porphyry mineralization in the Janja deposit is temporally and spatially associated with the diorite to quartz diorite and granodiorite granular to porphyry stocks that intruded in the Cretaceous flysch units. The Janja intrusions are represented by a Calc-alkaline and metaluminous geochemical affinity, and belong to the I-type granitoid series and subduction-related magmas in composition. Hydrothermal alterations in the area have been completely influenced by the Janja intrusion and as a result of the activity of these hydrothermal fluids, various types of potassic, propylitic, argillic and rarely phyllic alteration zones have been formed. In this deposit, three mineralization styles have been recognized including disseminated, vein-veinlet and stockwork which mineralization is mainly associated with potassic alteration. Mineralization zones in porphyry systems, including the supergene, enriched and hypogene zone, have been identified in the Janja deposit, which are the result of changes in the water table, weathering and erosion effects. The main sulfide minerals consist of chalcopyrite, pyrite, covellite, chalcocite, molybdenite, bornite, and oxide minerals including magnetite, hematite, goethite and hydro carbonate minerals including malachite and azurite. Fluid inclusion studies showed a homogenization temperature range from 301 to 540 ˚C and a mean salinity of 19 wt%NaCl for two-phase inclusions and a homogenization temperature range between 254 and >550 ˚C and mean salinities of 54 wt % NaCl for multiphase fluid inclusions. The results of these studies show that mixing processes have taken place in the Janja deposit and have caused the deposition of Cu-Mo-(Au) mineralization. Eventually, according to the various characteristics of the Janja deposit, including tectonic environment, host rock, mineralogy, ore-forming fluid, metal ore assemblage, mineralization and alteration patterns, and comparison of these characteristics with other porphyry deposits, it can be concluded that mineralization in Janja deposit is comparable with continental margin-type porphyry Cu-Mo-(Au) deposits.

Petrology

Mineral chemistry, thermobarometry and genesis of clinopyroxenes in Silurian mafic metavolcanic rocks of Maku, North West of Iran

Farzaneh Valinasab Zarnagh; Mohsen Moayyed; Ahmad Jahangiri; Hossein Azizi

Volume 32, Issue 4 , December 2022, , Pages 15-28

https://doi.org/10.22071/gsj.2022.307112.1944

Abstract

There are discontinuous outcrops of volcanic rocks in the West Azarbaijan province and in the north of Maku city. These volcanic complex were bimodal and compose of acidic and basic lava and pyroclastic rocks. Mineral chemistry studies show that clinopyroxenes in the studied rocks are diopside. These ... Read More

Stratigraphy and Palaeontology

Biostratigraphy of the Gurpi Formation based on planktonic foraminiferal in Bishe-deraz section, South of Ilam

faeze Amiri; E Zarei

Volume 29, Issue 115 , June 2020, , Pages 17-26

https://doi.org/10.22071/gsj.2019.153572.1561

Abstract

The Gurpi formation in Bishe-deraz Section, south of Ilam, consists of 201m marl with intercalations of limy marl with two formal members of Seymareh (Lopha) and Emam-Hasan. The formation overlies the Ilam Formation and is gradationally overlain by the purple shales of the basal part of the Pabdeh Formation. ... Read More

Mineral chemistry, thermobarometry and genesis of Clinopyroxenes in dyke swarm of northeast of meshkinshahr, NW Iran

M Fadaeian; A Jahangiri; M Moayyed

Volume 25, Issue 100 , September 2016, , Pages 19-36

https://doi.org/10.22071/gsj.2016.40672

Abstract

The study area is located in the Ardabil province and in the north east of Meshkinshahr city.More than 200 small and large Eocene age dykes have outcrops in this area with basaltic, tephritic, andesitic and trachy andesit composition. Clinopyroxene, plagioclase, analcime and sometimes coarse olivine ... Read More

reviewer

Volume 26, Issue 101 , December 2017, , Pages 2-2

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Reviewers

داوران

Volume 24, Issue 96 , September 2015, , Pages 2-3

Abstract

داوران

Volume 24, Issue 95 , June 2015, , Pages 2-3

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داوران Read More

reviewer

Volume 26, Issue 102 , March 2017, , Pages 2-2

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Investigation on Alam Chal Glacier Using Satellite Images

M. J. Valadan Zouj; Y. Rezaei; F. Vaziri; M.R. Mobasheri

Volume 18, Issue 70 , February 2009, , Pages 2-13

https://doi.org/10.22071/gsj.2009.57363

Abstract

A considerable portion of potable water in Iran is supplied by natural glaciers, and then the study and protection of these resources are a necessity. This investigation includes the assessment of glacier parameters such as maximum and minimum altitude, area and perimeter, position of snow line and etc. ... Read More

داوران

Volume 24, Issue 95 , June 2015, , Pages 3-3

Abstract

داوران Read More

داوران

Volume 24, Issue 95 , June 2015, , Pages 3-3

Abstract

داوران Read More

سخن سردبیر

Volume 24, Issue 95 , June 2015, , Pages 3-3

Abstract

سخن سردبیر Read More

Biostratigraphy of the Gurpi Formation in Kuh-e-Sefid Section, East of Ramhormoz

S Rahimi; A Sadeghi; M.R Partoazar

Volume 24, Issue 94 , March 2015, , Pages 3-10

https://doi.org/10.22071/gsj.2015.42555

Abstract

In this research, the biostratigraphy of the Gurpi Formation in Kuh-e-Sefid section in east of Ramhormoz is studied. The thickness of the Gurpi Formation is 190.5m and consists mainly of shale, argillaceous limestone and marl. The lower boundary with the Ilam Formation is comformable with sharp lithology ... Read More

Petrology and U-Pb Zircon Dating of Marfion Intrusive Complex, West of Kashan

M Honarmand; N Rashidnejad Omran; M.H Emami; Gh Nabatian

Volume 24, Issue 94 , March 2015, , Pages 3-16

https://doi.org/10.22071/gsj.2015.42736

Abstract

The Marfion Granitoid Complex is a part of Cenozoic plutonism, which located in the central part of the Urumieh–Dokhtar Magmatic Belt. This complex consists of four main intrusives, including the Mozvash micro-dioritic to micro-monzodioritic intrusive, which scattered as separate outcrops ... Read More

داوران

Volume 24, Issue 94 , March 2015, , Pages 3-3

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داوران

Volume 24, Issue 1393 , March 2015, , Pages 3-3

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داوران Read More

Determination of Optimal Bouguer Density and Modelling Bed Rock Topography in Charak Area Using Gravity Data (Southwest Iran)

H.R Samadi; A Teymoorian

Volume 24, Issue 93 , December 2014, , Pages 3-8

https://doi.org/10.22071/gsj.2004.43441

Abstract

In exploratory geophysics, main and primary purposes are determination of researching targets densities, which have a particular density difference with that of the host rock. In this study, hence, we introduce new method for density determination, called "variogram method”, which is based on the ... Read More

داوران

Volume 23, Issue 92 , September 2014, , Pages 3-3

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داوران

Volume 23, Issue 91 , June 2014, , Pages 3-3

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داوران Read More

داوران

Volume 23, Issue 90 , March 2014, , Pages 3-3

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داوران Read More

داوران

Volume 23, Issue 89 , December 2013, , Pages 3-3

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داوران Read More

Economic Geology

Sulfur isotope variations of sulfide minerals in porphyry systems of the Meiduk cluster, Kerman Cenozoic magmatic arc, southeastern Iran

Hadi Mohammaddoost; Majid Ghaderi; Jamshid Hassanzadeh

Volume 27, Issue 107 , June 2018, , Pages 3-16

https://doi.org/10.22071/gsj.2017.75379.1019

Abstract

Sulfur isotope data on pyrite, chalcopyrite and molybdenite in the A, B and D type veinlets in porphyry systems of the Meiduk cluster, located in northwestern part of the Kerman copper belt, show that these systems have near zero δ34S values. Sulfur isotope composition for the Chah-Firouzeh and ... Read More

Stratigraphy and Palaeontology

Sequence stratigraphy of the Aitamir Formation (Albian-Cenomanian) in Baghak and shurijeh sections-east Koppeh Dagh Basin

M. Allameh; A. Mahboubi; R. Moussavi-Harami; M. Khanehbad

Volume 26, Issue 103 , June 2017, , Pages 3-12

https://doi.org/10.22071/gsj.2017.46723

Abstract

The Aitamir Formation (Albian-Cenomanian) composed of siliciclastic rocks and several carbonate horizons. In order to study depositional environment and sequence stratigraghy, two stratigraghic sections studied in east Koppeht Dagh basin near the Baghak and Shurijeh villages. Field and petrograghic studies ... Read More

Sedimentology

Facies analysis and paleo-environmental reconstruction of the Neogene sediments in the Northern Dezful Embayment, Zagros

Najmeh Etemad-Saeed; Mahdi Najafi; Navid Zeinolabedin Qavim; Ghods Abdolreza

Volume 27, Issue 108 , September 2018, , Pages 3-12

https://doi.org/10.22071/gsj.2017.72739.1012

Abstract

The present study provides a detailed facies and depositional environment analyses of the Neogene sediments in the northern Dezful embayment, footwall of the Zagros Mountain Front fault. The Neogene sediments in this area, including the Mishan, Aghajari, and Bakhtyari formations, constitute the thickest ... Read More

Geochemistry of argillic alteration: a case study from the Jizvan area, Tarom-Hashtjin zone

A. Abedini

Volume 26, Issue 104 , September 2017, , Pages 3-16

https://doi.org/10.22071/gsj.2016.50099

Abstract

Intrusion of quartz-monzodioritic igneous bodies of Oligocene age into the Eocene lithic crystal tuffs and trachy-basalts resulted in occurrence of widespread argillic alteration zone in the Jizvan area (Tarom-Hashtjin zone). Mineralogical studies indicate that this alteration zone includes kaolinite, ... Read More Intrusion of quartz-monzodioritic igneous bodies of Oligocene age into the Eocene lithic crystal tuffs and trachy-basalts resulted in occurrence of widespread argillic alteration zone in the Jizvan area (Tarom-Hashtjin zone). Mineralogical studies indicate that this alteration zone includes kaolinite, quartz, smectite, pyrophyllite, muscovite-illite, alunite, rutile, calcite, feldspar, chlorite, hematite and goethite minerals. Hypogene ore minerals within the silicic-carbonatic veins and veinlets of argillic alteration zone contain chalcopyrite, galena and pyrite accompanied by goethite, malachite and azurite of supergene origin. Mass changes calculations of elements with assumption of Al as a monitor immobile element indicate that elements such as Ti, P, Th, Nb, Ta, Y and Zr have suffered leaching during argillization of lithic crystal tuffs. This abnormal behaviour is in relation to low pH of altering solutions, high water/rock ratio, abundance of complexing ions and suitable drainage system. The distribution pattern of REEs normalized to chondrite shows differentiation and enrichment of LREEs relative to HREEs and occurrence of negative Eu and Ce anomalies during argillization of lithic crystal tuffs. Geochemical investigations reveal that occurrence of negative Ce anomaly (0.49-0.92) is in relation to the destruction of zircon by acidic-oxidizing fluids. Negative Eu anomaly (0.23-0.73) and mass loss of elements such as Si, Fe, K, Rb, Cs, Sr and Ba indicate destruction of plagioclase and hornblende by strongly acidic hydrothermal fluids and high oxygen fugacity of environment. The correlation coefficients between elements display the controlling role of Mn-oxides in distribution and concentration of REEs, Pb, Zn and Cu. Mineralogical and geochemical evidence such as presence of pyrophyllite, alunite and rutile, enrichment of LREEs relative to HREEs, low values of La+Ce+Y, negative Ce anomaly and strong positive correlations between (LREEs/HREEs)N-LOI and (La/Lu)N-P suggest that the development and evolution of argillic alteration zone in the Jizvan area is affiliated to hypogene processes.

Volume 34 (2024)

Volume 33 (2023)

Volume 32 (2022)

Volume 31 (2021)

Volume 30 (2020)

Volume 29 (2020)

Volume 28 (2019)

Volume 27 (2018)

Volume 26 (2017)

Volume 25 (2016)

Volume 24 (2015)

Volume 23 (2014)

Volume 22 (2013)

Volume 21 (2012)

Volume 20 (2011)

Volume 19 (2010)

Volume 18 (2009)

Volume 17 (2008)

Volume 16 (2007)

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