University of IsfahanPetrological Journal2228-521010320191122Determination and mapping of hydrothermal alteration zones in exploration Marbin area (North of Zefreh) by remote sensing, field observations and petrology investigationsDetermination and mapping of hydrothermal alteration zones in exploration Marbin area (North of Zefreh) by remote sensing, field observations and petrology investigations1242437310.22108/ijp.2019.116297.1130FAMasumeMirzaiiDepartment of Geology, Faculty of Sciences, University of Isfahan, Isfahan,IranHashemBagheriDepartment of Geology, Faculty of Sciences, University of Isfahan, Isfahan,IranFarimahAyatiگروه زمینشناسی، دانشگاه پیامنور، ایرانJournal Article20190406In this research, the altered and non-altered zones in Marbin exploration area has been determined by VNIR and SWIR wavelengths processing of ASTER satellite images and by False Color composite and band ratio methods. Marbin exploration area is situated in Urumieh-Dokhtar magmatic belt. Marbin index is located in the east of Zefreh fault within central part of Zefreh pull apart basin. The composition of Eocene subvolcanic and volcanic units of this area is rhyolite to dacite. The spectral of sericite, epidote, calcite and chlorite minerals in this area have been recognized by using the Spectral angle mapper (SAM). Finally with combination of spectral of index minerals in phyllic and propyllitic alteration zone with field observations, petrograghy and geochemical analysis, the alteration zones map in Marbin area have been prepared. As a result, phyllic and propylitic alterations as well as silicification are index alterations in this area. Based on litho-geochemical analysis, high contents of Mo/Cu and occurrence of hydrothermal alterations besides other evidences, Marbin index can be introduced as a porphyry deposit with Mo anomaly. This could be indicative of the potential of this area for the molybdenum mineralization in detailed exploration phase.In this research, the altered and non-altered zones in Marbin exploration area has been determined by VNIR and SWIR wavelengths processing of ASTER satellite images and by False Color composite and band ratio methods. Marbin exploration area is situated in Urumieh-Dokhtar magmatic belt. Marbin index is located in the east of Zefreh fault within central part of Zefreh pull apart basin. The composition of Eocene subvolcanic and volcanic units of this area is rhyolite to dacite. The spectral of sericite, epidote, calcite and chlorite minerals in this area have been recognized by using the Spectral angle mapper (SAM). Finally with combination of spectral of index minerals in phyllic and propyllitic alteration zone with field observations, petrograghy and geochemical analysis, the alteration zones map in Marbin area have been prepared. As a result, phyllic and propylitic alterations as well as silicification are index alterations in this area. Based on litho-geochemical analysis, high contents of Mo/Cu and occurrence of hydrothermal alterations besides other evidences, Marbin index can be introduced as a porphyry deposit with Mo anomaly. This could be indicative of the potential of this area for the molybdenum mineralization in detailed exploration phase.https://ijp.ui.ac.ir/article_24373_5fd16c87f59bf15a539b2489cae62da4.pdfUniversity of IsfahanPetrological Journal2228-521010320191122Mineral chemistry and termometry of the high-Mg ultramafic lava flows (Komatiite), NE Iran: evidence of plume-arc interaction in the Upper Paleozoic Mashhad-Fariman subduction zoneMineral chemistry and termometry of the high-Mg ultramafic lava flows (Komatiite), NE Iran: evidence of plume-arc interaction in the Upper Paleozoic Mashhad-Fariman subduction zone25522408810.22108/ijp.2019.115872.1123FAMohsenMobasheriDepartment of Petrology and Economic Geology, Faculty of Earthsciences, Shahrood University of Technology, Shahrood, IranHabibollahGhasemiDepartment of Petrology and Economic Geology- Faculty of Earthsciences- Shahrood University of Technology- Shahrood- IranBehnamRahimiDepartment of Geology, Faculty of sciences, Ferdowsi University of Mashhad, Mashhad, IranArashGourabjiri-pourDepartment of Geology, Faculty of Science, Open University, Miyane Branch, Miyane, IranJournal Article20190305In the northeast of Iran, there are some outcrops of high-Mg ultramafic volcanic rocks. These rocks have been interpreted as an ideal ophiolite sequence related to the closure of Paleo-Tethys. According to detailed field observations, the komatiitic lava flows in Shandiz- Virani- Mashhad Complex (SVMC) and Fariman Complex (FC), are interlayered with the Upper Paleozoic submarine turbiditic sediments (Carboniferous-Permian). These rocks have a wide range of volcanic facies and according to the lithofacies characteristics, are divided into three groups of differentiated, undifferentiated lava flows and pillow lavas with a variety of volcanic textures and glass groundmass and with the main minerals of olivine, chromian spinel, clinopyroxene and amphibole. In this paper, the komatiitic nature of these rocks has been proven by explicit evidence from the field characteristics, petrography, internal stratigraphy and mineral chemistry. Also, the interaction of a mantle plume with the late Paleozoic (Permian) northeast subduction zone of Paleo-Tethys in NE Iran is considered as the suitable petrogenetic model involved in the genesis of the Komatiitic magma. This model can well justify and interpret the various geochemical characteristics of the studied rocks.In the northeast of Iran, there are some outcrops of high-Mg ultramafic volcanic rocks. These rocks have been interpreted as an ideal ophiolite sequence related to the closure of Paleo-Tethys. According to detailed field observations, the komatiitic lava flows in Shandiz- Virani- Mashhad Complex (SVMC) and Fariman Complex (FC), are interlayered with the Upper Paleozoic submarine turbiditic sediments (Carboniferous-Permian). These rocks have a wide range of volcanic facies and according to the lithofacies characteristics, are divided into three groups of differentiated, undifferentiated lava flows and pillow lavas with a variety of volcanic textures and glass groundmass and with the main minerals of olivine, chromian spinel, clinopyroxene and amphibole. In this paper, the komatiitic nature of these rocks has been proven by explicit evidence from the field characteristics, petrography, internal stratigraphy and mineral chemistry. Also, the interaction of a mantle plume with the late Paleozoic (Permian) northeast subduction zone of Paleo-Tethys in NE Iran is considered as the suitable petrogenetic model involved in the genesis of the Komatiitic magma. This model can well justify and interpret the various geochemical characteristics of the studied rocks.https://ijp.ui.ac.ir/article_24088_638873f082b98e175e198b55cc58f91d.pdfUniversity of IsfahanPetrological Journal2228-521010320191122Mineralogy, mineral chemistry and sulfur isotope geochemistry of the Baharieh copper deposit (NE Kashmar): implications for ore genesisMineralogy, mineral chemistry and sulfur isotope geochemistry of the Baharieh copper deposit (NE Kashmar): implications for ore genesis53782427410.22108/ijp.2019.115778.1122FARaziehRezaeihamidDepartment of Geology, Bu-Ali Sina University, Hamedan, IranEbrahimTale FazelDepartment of Geology, Faculty of science, Bu-Ali Sina universityJournal Article20190301The Baharieh copper deposit with an approximately tonnage 1 million tons of copper ore, is located in the Khorasan Razavi Province and 30 km of northeastern of the Kashmar. Based on subdivision structural geology of the Iran, the deposit is situated in the Sabzevar zone and Taknar complex. The mineralization as stratabound nature in an ore-horizon with an approximately length of 200 m and E-W trending occurs in middle Eocene andesitic to rhyolitic-tuff. Chalcopyrite and pyrite are the main sulfide minerals which accompanies with accessory minerals such as bornite, galena, sphalerite, covelline, chalcocite, malachite and hematite. Based on evidence of the electron probe micro analysis (EPMA) detected the maximum gold and silver contents 0.21 and 0.1 ppm in chalcopyrite, respectively and the maximum silver content is 0.14 ppm in galena. According to mineral chemistry studies, pyrite of the Baharieh deposit obtained the average ratio Co/Ni=2.71, which can be indicate its hydrothermal source. According to the results of the geo-thermometry of the Sb/Bi ratio in the galena and geochemistry of sphalerite (high concentration of Cd with an average value of 9220 ppm and low Zn/Cd=67.54) physico-chemical and thermodynamic conditions of the ore-bearing fluid in the Baharieh deposit has been concordant with average-temperature hydrothermal-magmatic deposits. The variation ranges of δ34S isotopic in the chalcopyrite and pyrite samples are varies between -7.3 to 0.5 ‰.The Baharieh copper deposit with an approximately tonnage 1 million tons of copper ore, is located in the Khorasan Razavi Province and 30 km of northeastern of the Kashmar. Based on subdivision structural geology of the Iran, the deposit is situated in the Sabzevar zone and Taknar complex. The mineralization as stratabound nature in an ore-horizon with an approximately length of 200 m and E-W trending occurs in middle Eocene andesitic to rhyolitic-tuff. Chalcopyrite and pyrite are the main sulfide minerals which accompanies with accessory minerals such as bornite, galena, sphalerite, covelline, chalcocite, malachite and hematite. Based on evidence of the electron probe micro analysis (EPMA) detected the maximum gold and silver contents 0.21 and 0.1 ppm in chalcopyrite, respectively and the maximum silver content is 0.14 ppm in galena. According to mineral chemistry studies, pyrite of the Baharieh deposit obtained the average ratio Co/Ni=2.71, which can be indicate its hydrothermal source. According to the results of the geo-thermometry of the Sb/Bi ratio in the galena and geochemistry of sphalerite (high concentration of Cd with an average value of 9220 ppm and low Zn/Cd=67.54) physico-chemical and thermodynamic conditions of the ore-bearing fluid in the Baharieh deposit has been concordant with average-temperature hydrothermal-magmatic deposits. The variation ranges of δ34S isotopic in the chalcopyrite and pyrite samples are varies between -7.3 to 0.5 ‰.https://ijp.ui.ac.ir/article_24274_0438d9fb12269c9a3886d5d7aa7e2af2.pdfUniversity of IsfahanPetrological Journal2228-521010320191122Petrology, geochemistry and tectonomagmatic setting of Zajkan granitoid, Tarom-Hashtjin sub-zone, West of QazvinPetrology, geochemistry and tectonomagmatic setting of Zajkan granitoid, Tarom-Hashtjin sub-zone, West of Qazvin791002441310.22108/ijp.2020.118649.1147FAAmir AbbasSeyedqaraeiniGeology Department, Faculty of Science, University of ZanjanMir Ali AsgharMokhtariزنجان، دانشگاه زنجان، دانشکده علوم، گروه زمین شناسی0009-0005-1226-5254HosseinKouhestaniGeology department, Faculty of Science, University of ZanjanJournal Article20190807Zajkan area as a part of Tarom-Hashjin magmatic belt contains some granitic intrusions which are intruded into the Eocene volcano-sedimentary rocks. Eocene volcano-sedimentary rocks include alternation of acidic to intermediate tuffs and lavas. Petrographical studies demonstrate that these intrusions composed of gabbro, pyroxene quartz monzodiorite, pyroxene quartz monzonite and granodiorite. These intrusions have high-K calc-alkaline nature and classified as I-type metaluminous granitoids. Based on the spider diagrams, these intrusions have similar patterns which are indicative for their genetic relation. These diagrams indicate enriched LILEs along with negative anomalies of HFSEs. Chondrite-normalized REE patterns demonstrate LREE enrichment with high ratio of LREE/HREE and (La/Yb)N ratio between 6.1-9.1. Based on field investigation, petrological and geochemical studies, and tectonic setting discrimination diagrams, it seems that Zajkan intrusions were formed from a subduction related metasomatized lithospheric mantle in a post-collisional setting.Zajkan area as a part of Tarom-Hashjin magmatic belt contains some granitic intrusions which are intruded into the Eocene volcano-sedimentary rocks. Eocene volcano-sedimentary rocks include alternation of acidic to intermediate tuffs and lavas. Petrographical studies demonstrate that these intrusions composed of gabbro, pyroxene quartz monzodiorite, pyroxene quartz monzonite and granodiorite. These intrusions have high-K calc-alkaline nature and classified as I-type metaluminous granitoids. Based on the spider diagrams, these intrusions have similar patterns which are indicative for their genetic relation. These diagrams indicate enriched LILEs along with negative anomalies of HFSEs. Chondrite-normalized REE patterns demonstrate LREE enrichment with high ratio of LREE/HREE and (La/Yb)N ratio between 6.1-9.1. Based on field investigation, petrological and geochemical studies, and tectonic setting discrimination diagrams, it seems that Zajkan intrusions were formed from a subduction related metasomatized lithospheric mantle in a post-collisional setting.https://ijp.ui.ac.ir/article_24413_f0ba039c1e89102ed5ff02b9eb829b36.pdfUniversity of IsfahanPetrological Journal2228-521010320191122Geochemistry and Geodynamic setting of Crustal sequence in Shahini ophiolitic complex, NW of KamyaranGeochemistry and Geodynamic setting of Crustal sequence in Shahini ophiolitic complex, NW of Kamyaran1011302440710.22108/ijp.2020.117713.1142FABahmanRahimzadehDepartment of geology, faculty of earth science, shahid beheshti university, tehran, iranAyoubVeisiniaDepartment of Geology, Zanjan University, Zanjan, IranMohammadEbrahimiDepartment of Geology, Faculty of Science, University of ZanjanRasoulEsmaeili3University of Chinese Academy of Sciences, Beijing 100049, ChinaJournal Article20190618The Shahini ophiolitic complex is located west of Kamyaran as a ring connection between the Kermanshah and Kurdistan ophiolites, outcropped along the Zagros and Neotethys suture zone, in western Iran. This complex include the mantle peridotites and crustal sequence. The peridotites are highly serpentinized mantle peridotites consist of cpx-bearing harzburgite and lherzolite that cross cut by isolated diabasic dikes. The crustal sequence include pegmatic gabbros, Isotropic gabbro, microgabbroic dykes, basalt and pyroclastic andesite. The sedimentary-volcanic sequence consist of shale, limestone, sandstone and tuff horizons covered the extrusive sequence. Based on chemical analyses the crustal sequence shows the various composition with tholeiitic to calcalkaline affinity. In the tectonomagmatic diagrams, these rocks are often plotted in the MORB regions and in some occasions, they are plotted in volcanic arcs regions. The enrichment in LILE, slightly depletion of HFSE, different enrichment in LREE and linear trends of HREE suggested the magma source originated in the arc environment from the heterogeneous mantle with varying degrees of partial melting. However, the low ratios of Th/Yb, La/Nb, Ce/Nb and Ce/Th inclined the tendency between the IAB and MORB environments. The depth of partial melting estimate between 50 to 60 km correlating and show the partial melting happens in the spinel lherzolite zone. Field relationships and geochemical evidence indicate that Kamyaran ophiolites formed in the oceanic basin in the ocean-continent borders zone in the northwest margin of Neotethys Ocean.The Shahini ophiolitic complex is located west of Kamyaran as a ring connection between the Kermanshah and Kurdistan ophiolites, outcropped along the Zagros and Neotethys suture zone, in western Iran. This complex include the mantle peridotites and crustal sequence. The peridotites are highly serpentinized mantle peridotites consist of cpx-bearing harzburgite and lherzolite that cross cut by isolated diabasic dikes. The crustal sequence include pegmatic gabbros, Isotropic gabbro, microgabbroic dykes, basalt and pyroclastic andesite. The sedimentary-volcanic sequence consist of shale, limestone, sandstone and tuff horizons covered the extrusive sequence. Based on chemical analyses the crustal sequence shows the various composition with tholeiitic to calcalkaline affinity. In the tectonomagmatic diagrams, these rocks are often plotted in the MORB regions and in some occasions, they are plotted in volcanic arcs regions. The enrichment in LILE, slightly depletion of HFSE, different enrichment in LREE and linear trends of HREE suggested the magma source originated in the arc environment from the heterogeneous mantle with varying degrees of partial melting. However, the low ratios of Th/Yb, La/Nb, Ce/Nb and Ce/Th inclined the tendency between the IAB and MORB environments. The depth of partial melting estimate between 50 to 60 km correlating and show the partial melting happens in the spinel lherzolite zone. Field relationships and geochemical evidence indicate that Kamyaran ophiolites formed in the oceanic basin in the ocean-continent borders zone in the northwest margin of Neotethys Ocean.https://ijp.ui.ac.ir/article_24407_10368b81ee96c67efe15bde3ae58c102.pdfUniversity of IsfahanPetrological Journal2228-521010320191122Magmatic characteristics and crystallization condition of the Gasht- Masuleh gabbros (North of Iran) based on clinopyroxene and orthopyroxene compositionMagmatic characteristics and crystallization condition of the Gasht- Masuleh gabbros (North of Iran) based on clinopyroxene and orthopyroxene composition1311482453010.22108/ijp.2020.119832.1151FALeilaRezaeiDepartment of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, IranMohssenMoazzenDepartment of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, IranMartinTimmermanInstitute of Geosciences , University of Potsdam, Potsdam, GermanyJournal Article20191209The Alborz Range, as a part of the Alpine-Himalayan orogeny, formed during the Cimmerian orogeny due to northward movements of the Central Iran micro-plate towards Eurasia. Subsequently, it underwent different compressional and extensional geological events from the Late Triassic collision to the recent ongoing contraction and volcanism. The gabbros in the Gasht-Masuleh area are small kilometer-sized cumulate and isotropic gabbro bodies that intruded the Paleozoic metasediments and Mesozoic sediments in the three localities including Chapul, Gilvandehrud, and Zudel. Clinopyroxene chemistry suggests that the calc-alkaline parent magma formed in a transitional environment between arc and extension related tectonic settings. Diopside clinopyroxene composition is Wo<sub>47-51</sub> En<sub>43-49</sub> Fs<sub>4-9</sub> and enstatite orthopyroxene has Wo<sub>0-3</sub> En<sub>71-79</sub> Fs<sub>20-28 </sub>composition. The low TiO<sub>2</sub> content of clinopyroxene indicates a depletion of parental magma source during old subduction in the north of Iran. Using different thermometers, based on clinopyroxene and orthopyroxene composition suggest that the crystallization temperature of pyroxene was low (~800 ℃). Al<sub>2</sub>O<sub>3</sub>, Na<sub>2</sub>O and Cr<sub>2</sub>O<sub>3</sub> contents of orthopyroxene and clinopyroxene are low indicating the crystallization of the parent magma at low pressure at upper crustal levels.The Alborz Range, as a part of the Alpine-Himalayan orogeny, formed during the Cimmerian orogeny due to northward movements of the Central Iran micro-plate towards Eurasia. Subsequently, it underwent different compressional and extensional geological events from the Late Triassic collision to the recent ongoing contraction and volcanism. The gabbros in the Gasht-Masuleh area are small kilometer-sized cumulate and isotropic gabbro bodies that intruded the Paleozoic metasediments and Mesozoic sediments in the three localities including Chapul, Gilvandehrud, and Zudel. Clinopyroxene chemistry suggests that the calc-alkaline parent magma formed in a transitional environment between arc and extension related tectonic settings. Diopside clinopyroxene composition is Wo<sub>47-51</sub> En<sub>43-49</sub> Fs<sub>4-9</sub> and enstatite orthopyroxene has Wo<sub>0-3</sub> En<sub>71-79</sub> Fs<sub>20-28 </sub>composition. The low TiO<sub>2</sub> content of clinopyroxene indicates a depletion of parental magma source during old subduction in the north of Iran. Using different thermometers, based on clinopyroxene and orthopyroxene composition suggest that the crystallization temperature of pyroxene was low (~800 ℃). Al<sub>2</sub>O<sub>3</sub>, Na<sub>2</sub>O and Cr<sub>2</sub>O<sub>3</sub> contents of orthopyroxene and clinopyroxene are low indicating the crystallization of the parent magma at low pressure at upper crustal levels.https://ijp.ui.ac.ir/article_24530_5c92a88598f936095955275b71ce5ee4.pdfUniversity of IsfahanPetrological Journal2228-521010320191122Volume & Issue: Volume 10, Issue 3 - Serial Number 39, July 2019Volume & Issue: Volume 10, Issue 3 - Serial Number 39, July 20192672310.22108/ijp.2019.26723FAJournal Article20220621https://ijp.ui.ac.ir/article_26723_55863bf90ced31f16e390272c4202406.pdf