University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Full Journal + Appendixes (Spring 2015) Full Journal + Appendixes (Spring 2015) 0 16204 FA Journal Article 2016 06 14 https://ijp.ui.ac.ir/article_16204_0970fa4d34446fc2c1c3bb966cad1026.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Determination of Alishar Cu index (Markazi province) formation conditions using mineralography and fluid inclusions data Determination of Alishar Cu index (Markazi province) formation conditions using mineralography and fluid inclusions data 1 18 16201 FA Ahmad Reza Mokhtari Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran Farimah Ayati اصفهان- سه راه سیمین- کوچه جنب اداره مالیات- مجتمع شهاب- واحد 3- آیتی Hooshang Asadi Harooni Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran Hashem Bagheri Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Marzieh Gaedamini Harouni Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Journal Article 2016 06 14 The Alishar Cu-Au index is located in the Markazi province within the Uromieh-Dokhtar magmatic belt. The mineralized zone is hosted by andesitic to andesite basalt lava units, andesitic-andesite basalt tuff and rhyolitic to dacitic tuff (Eocene-Oligocene). The area is affected later by young granodiorite and monzodiorite plutonic units (Oligo-Momiocene). As a result of hydrothermal alterations, phyllic and propylitic alterations as well as kaolinitization and silicification developed in the area. In addition, Cu -Au mineralization has been introduced into the area, mainly associated with silicic veins. Based on geochemical data the Cu and Au contents of the samples are about 0.5% and 0.3 ppm respectively. Also, the Bi content of the studied samples is about 0.5 ppm. The index comprises oxidation, hypogene and supergene zones and contains chalcopyrite, pyrite, chalcocite, magnetite, hematite, goethite and malachite. Fluid inclusion studies of the samples taken from silicic veins show that the homogenization temperature and salinity vary between 200 to 300 °C and 21.6% wt NaCl respectively. On the base of obtained data, it can be concluded that the dominant mechanism for mineralization is the mixing of hydrothermal solutions with meteoritc waters. Geological, mineralogical and fluid inclusion investigations have demonstrated that mineralization in this area is correlated with other IOCG deposits in the world. The Alishar Cu-Au index is located in the Markazi province within the Uromieh-Dokhtar magmatic belt. The mineralized zone is hosted by andesitic to andesite basalt lava units, andesitic-andesite basalt tuff and rhyolitic to dacitic tuff (Eocene-Oligocene). The area is affected later by young granodiorite and monzodiorite plutonic units (Oligo-Momiocene). As a result of hydrothermal alterations, phyllic and propylitic alterations as well as kaolinitization and silicification developed in the area. In addition, Cu -Au mineralization has been introduced into the area, mainly associated with silicic veins. Based on geochemical data the Cu and Au contents of the samples are about 0.5% and 0.3 ppm respectively. Also, the Bi content of the studied samples is about 0.5 ppm. The index comprises oxidation, hypogene and supergene zones and contains chalcopyrite, pyrite, chalcocite, magnetite, hematite, goethite and malachite. Fluid inclusion studies of the samples taken from silicic veins show that the homogenization temperature and salinity vary between 200 to 300 °C and 21.6% wt NaCl respectively. On the base of obtained data, it can be concluded that the dominant mechanism for mineralization is the mixing of hydrothermal solutions with meteoritc waters. Geological, mineralogical and fluid inclusion investigations have demonstrated that mineralization in this area is correlated with other IOCG deposits in the world. https://ijp.ui.ac.ir/article_16201_1df4f7b92690d7e464fbe668f51d4766.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Mineralogical and geochemical studies to determine genesis of Khalkuh bentonite mine, Ferdows, Southern Khorasan Mineralogical and geochemical studies to determine genesis of Khalkuh bentonite mine, Ferdows, Southern Khorasan 19 34 16194 FA Soroush Modabberi School of Geology, College of Sciences, University of Tehran, Tehran, Iran Mohsen Ranjbaran School of Geology, College of Sciences, University of Tehran, Tehran, Iran Alireza Namayandeh School of Geology, College of Sciences, University of Tehran, Tehran, Iran Journal Article 2016 06 14 The Khalkoh bentonite mine is located in Ferdows, southern Khorasan province. In this research, genesis of Khalkoh mine was determined using mineralogical and geochemical studies. Analytical methods including x-ray diffraction (XRD) and chemical analyses (XRF and ICP-MS) performed on bentonite and country rock samples as well. The studied bentonites consist mainly of sodium montmorillonite. They also contain cristobalite, quartz, albite, calcite, halite and illite as minor phases. The stratabound nature of minerals, high amount of montmorillonite, the presence of gypsum layers alternating with bentonite and the lack of hydrothermal alteration indicate that bentonite deposit was formed in the diagenetic process by means of volcanic glasses alteration to bentonite in the lagoon. In spite of leaching of alkalies, the Si has not been leached from the system. This is supported by the presence of opal-CT and quartz and generally, shows the low fluid flow rate in the system. Based on the geochemical data, the parent magma and rock series are rhyodacite/dacite and calc-alkali series, respectively, formed in volcanic arc setting. The Khalkoh bentonite mine is located in Ferdows, southern Khorasan province. In this research, genesis of Khalkoh mine was determined using mineralogical and geochemical studies. Analytical methods including x-ray diffraction (XRD) and chemical analyses (XRF and ICP-MS) performed on bentonite and country rock samples as well. The studied bentonites consist mainly of sodium montmorillonite. They also contain cristobalite, quartz, albite, calcite, halite and illite as minor phases. The stratabound nature of minerals, high amount of montmorillonite, the presence of gypsum layers alternating with bentonite and the lack of hydrothermal alteration indicate that bentonite deposit was formed in the diagenetic process by means of volcanic glasses alteration to bentonite in the lagoon. In spite of leaching of alkalies, the Si has not been leached from the system. This is supported by the presence of opal-CT and quartz and generally, shows the low fluid flow rate in the system. Based on the geochemical data, the parent magma and rock series are rhyodacite/dacite and calc-alkali series, respectively, formed in volcanic arc setting. https://ijp.ui.ac.ir/article_16194_bff835842ca10a4e30b0505107e607ae.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 The composition of the major minerals in the Nasrand intrusive rocks and its dikes The composition of the major minerals in the Nasrand intrusive rocks and its dikes 35 54 16202 FA Ali Kananian School of Geology, College of Sciences, University of Tehran, Tehran, Iran Jamshid Ahmadian Fatemeh Sarjoughian کردستان سنندج دانشگاه کردستان Journal Article 2016 06 14 The Nasrand intrusion, in the central part of Uromieh-Dokhtar magmatic belt is mainly composed of granite and granodiorite. The intrusive rocks are hosted by various dikes trending NW-SE. The granites and granodiorites are dominated by plagioclase, K-feldspar, quartz, biotite, amphibole, whereas the dikes are characterized b similar mineralogy in addition to pyroxene. The amphiboles are calcic with (Na+K)A≤0.5 and magnesio -hornblende composition in the granitic rocks with (Na+K)A>0.5 and AlIV3 are magnesio-biotites. The pyroxenes in the studied dikes are clinopyroxene with augite composition. The mineral chemistry of the biotites, amphiboles and pyroxenes indicate that this intrusion is calc-alkaline and have been crystallized in a subduction zone setting. The Nasrand intrusion, in the central part of Uromieh-Dokhtar magmatic belt is mainly composed of granite and granodiorite. The intrusive rocks are hosted by various dikes trending NW-SE. The granites and granodiorites are dominated by plagioclase, K-feldspar, quartz, biotite, amphibole, whereas the dikes are characterized b similar mineralogy in addition to pyroxene. The amphiboles are calcic with (Na+K)A≤0.5 and magnesio -hornblende composition in the granitic rocks with (Na+K)A>0.5 and AlIV3 are magnesio-biotites. The pyroxenes in the studied dikes are clinopyroxene with augite composition. The mineral chemistry of the biotites, amphiboles and pyroxenes indicate that this intrusion is calc-alkaline and have been crystallized in a subduction zone setting. https://ijp.ui.ac.ir/article_16202_e34f7b5bac19bdb188651619bb1deaf5.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Petrology, thermobarometry and U-Pb dating on the rocks of Delbar complex, Biarjmand area (southeast of Shahrood) Petrology, thermobarometry and U-Pb dating on the rocks of Delbar complex, Biarjmand area (southeast of Shahrood) 55 82 16200 FA Hadi Omrani Department of Geology, Faculty of Sciences, Golestan University, Gorgan, Iran Mahmood Sadeghian Department of Petrology, School of Geosciences, Shahrood University of Technology, Shahrood, Iran Mohammad Mohajjel Department of Geology, School of Basic Sciences, Tarbiat Modares University, Tehran, Iran Maryam Balaghi Einaluo Department of Petrology, School of Geosciences, Shahrood University of Technology, Shahrood, Iran Mahmood Sadeghian دانشگاه صنعتی شاهرود - دانشکده علوم زمین Habibollah Ghasemi شاهرود- بلوار دانشگاه- دانشگاه صنعتی شاهرود- دانشکده علوم زمین Journal Article 2016 06 14 The Delbar metamorphic complex is located 130 km southeast of Shahrood (Biarjmand area) in the northern margin of the Central Iran. This complex consists of four groups include metapelitic, metapsammitic, metacarbonatic and metabasitic compositions. Field evidences indicate the protolith of the complex were shale and sandstone (psammite and graywacke) alternation with carbonate layers in the upper parts. The complex crosscut by numerous diabasic dikes with late Neoprotrozoic- early Cambrian age which evolved to the foliated metabasites such as amphibole schist, amphibolite and garnet amphibolite. The sedimentary sequence in which diabasic dikes intruded subjected by intermediate P-T regional metamorphism (Barrovian type). The results of thermometry based on the varied calibrations of garnet-biotite pair and barometry through GBPQ method demonstrate 468-498 ˚C and 6.4-7.2 Kbar for micaschists and 645-706 ˚C and 8.4-13.2 Kbar for gneisses indicating greenschist for micashists and upper amphibolite facies for gneisses respectively. The increase of temperature and pressure confirms the prograde regional metamorphism event up to acheive the melting point and the partial melting initiation. The diverse migmatite structures generated in the metapelitic and metapsamitic rocks from felsic meltsexposed as the anatectic granites and leucogranites. The results of U-Pb age dating indicate 541±4.7 Ma to 547±9.9 Ma (late Neoprotrozoic- early Cambrian) age range. The regional metamorphism event in the Delbar complex is related to the Pan-African orogeny according to the obtained age data and with comparsion to the other similar metamorphic complexes and granitoids in the Central Iran. The Delbar metamorphic complex is located 130 km southeast of Shahrood (Biarjmand area) in the northern margin of the Central Iran. This complex consists of four groups include metapelitic, metapsammitic, metacarbonatic and metabasitic compositions. Field evidences indicate the protolith of the complex were shale and sandstone (psammite and graywacke) alternation with carbonate layers in the upper parts. The complex crosscut by numerous diabasic dikes with late Neoprotrozoic- early Cambrian age which evolved to the foliated metabasites such as amphibole schist, amphibolite and garnet amphibolite. The sedimentary sequence in which diabasic dikes intruded subjected by intermediate P-T regional metamorphism (Barrovian type). The results of thermometry based on the varied calibrations of garnet-biotite pair and barometry through GBPQ method demonstrate 468-498 ˚C and 6.4-7.2 Kbar for micaschists and 645-706 ˚C and 8.4-13.2 Kbar for gneisses indicating greenschist for micashists and upper amphibolite facies for gneisses respectively. The increase of temperature and pressure confirms the prograde regional metamorphism event up to acheive the melting point and the partial melting initiation. The diverse migmatite structures generated in the metapelitic and metapsamitic rocks from felsic meltsexposed as the anatectic granites and leucogranites. The results of U-Pb age dating indicate 541±4.7 Ma to 547±9.9 Ma (late Neoprotrozoic- early Cambrian) age range. The regional metamorphism event in the Delbar complex is related to the Pan-African orogeny according to the obtained age data and with comparsion to the other similar metamorphic complexes and granitoids in the Central Iran. https://ijp.ui.ac.ir/article_16200_b344840488b15af4c061ff85ce101e39.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Petrography and mineral chemistry of the east Nabar volcanic rocks (southwest of Kashan) Petrography and mineral chemistry of the east Nabar volcanic rocks (southwest of Kashan) 83 106 16195 FA Leila Ebrahimi Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Seyed Mohsen Tabatabaei Manesh Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Journal Article 2016 06 14 The east Nabar volcanic rocks with Eocene age are located in the southwest of Kashan and Uromieh-Dokhtar magmatic belt. These rocks are composed of basaltic andesite, andesite, dacite and rhyolite. Plagioclase, amphibole, clinopyroxene, biotite and quartz are the essential minerals of these rocks. Very few apatites are observed in some plagioclases. Epidote, calcite, chlorite, sphene and opaque are secondary minerals. Porphyritic, glomeroporphyric, microlitic and poikilitic textures are common textures in these rocks. On the base of microprobe analyses the composition of plagioclase ranges from oligoclase to labradorite, the clinopyroxenes are diopside and the amphiboles are magnesio-hornblende and tremolite. The chemistry of clinopyroxenes show that these rocks belong to sub-alkaline series and volcanic arcs. On the base of barometry of clinopyroxenes, the study rocks formed in medium to low pressure during their ascending. The volume of water in the crystallization environment of clinopyroxenes was high and the rocks studied formed in high oxygen fugacity. The thermometry of clinopyroxenes reveals the temperature of 975 oC for their crystallization. The amphiboles thermobarometry shows the pressure of 2.97 kbar and the temperature of 700-750 oC. The east Nabar volcanic rocks with Eocene age are located in the southwest of Kashan and Uromieh-Dokhtar magmatic belt. These rocks are composed of basaltic andesite, andesite, dacite and rhyolite. Plagioclase, amphibole, clinopyroxene, biotite and quartz are the essential minerals of these rocks. Very few apatites are observed in some plagioclases. Epidote, calcite, chlorite, sphene and opaque are secondary minerals. Porphyritic, glomeroporphyric, microlitic and poikilitic textures are common textures in these rocks. On the base of microprobe analyses the composition of plagioclase ranges from oligoclase to labradorite, the clinopyroxenes are diopside and the amphiboles are magnesio-hornblende and tremolite. The chemistry of clinopyroxenes show that these rocks belong to sub-alkaline series and volcanic arcs. On the base of barometry of clinopyroxenes, the study rocks formed in medium to low pressure during their ascending. The volume of water in the crystallization environment of clinopyroxenes was high and the rocks studied formed in high oxygen fugacity. The thermometry of clinopyroxenes reveals the temperature of 975 oC for their crystallization. The amphiboles thermobarometry shows the pressure of 2.97 kbar and the temperature of 700-750 oC. https://ijp.ui.ac.ir/article_16195_6cb0c584478229d6ed61f9643173d370.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Petrography and geochemistry of Mio-Pliocene volcanic masses in the north of Shahre-Babak, insight on neogene adakitic magmatism Petrography and geochemistry of Mio-Pliocene volcanic masses in the north of Shahre-Babak, insight on neogene adakitic magmatism 107 122 16198 FA Gholamreza Ghadami بندرعباس دانشگاه هرمزگان ک پ 3995 Mohammad Poosti Department of Geology, Faculty of Sciences, Hormozgan University, Bandar Abass, Iran Sara Ebadi Department of Geology, Faculty of Sciences, Hormozgan University, Bandar Abass, Iran Journal Article 2016 06 14 The Mio-Pliocene volcanic rocks are exposed in the north and the northwest of Shahre-babak (Trishkuh, Miduk and Sara masses) Kerman province. These rocks formed a part of Uromieh-Dokhtar magmatic belt and consist of andesites and dacites. The rocks studied have porphyritic texture and Phenocrysts wiht plagioclase, sanidine, amphibole, biotite and quartz. Based on geochemical data and multielements pattern, these rocks are medium to high K calc-alkaline suite and show LILE and LREE enriched normalized multi-element patterns, and Nb and Ti deplated. Chondrite normalized REE patterns of the studied volcanic rocks display a decrease from LREE to HREE without any Eu anomaly and formed in subduction zone in an active continental margin. They have higher SiO2, Sr content, Sr/Y and La/Yb ratios and lower MgO, Y and Yb contents in compare to those of normal calc-alkaline volcanic rocks and show characteristics of HSA (high SiO2 adakites). HREE and Y depleted patterns suggest the existence of garnet and amphibole as a residue in the source. The source of these rocks was probably garnet-amphibolite possibly generated during subduction of the Neo-Tethyan oceanic slab beneath the Central Iran zone. The Mio-Pliocene volcanic rocks are exposed in the north and the northwest of Shahre-babak (Trishkuh, Miduk and Sara masses) Kerman province. These rocks formed a part of Uromieh-Dokhtar magmatic belt and consist of andesites and dacites. The rocks studied have porphyritic texture and Phenocrysts wiht plagioclase, sanidine, amphibole, biotite and quartz. Based on geochemical data and multielements pattern, these rocks are medium to high K calc-alkaline suite and show LILE and LREE enriched normalized multi-element patterns, and Nb and Ti deplated. Chondrite normalized REE patterns of the studied volcanic rocks display a decrease from LREE to HREE without any Eu anomaly and formed in subduction zone in an active continental margin. They have higher SiO2, Sr content, Sr/Y and La/Yb ratios and lower MgO, Y and Yb contents in compare to those of normal calc-alkaline volcanic rocks and show characteristics of HSA (high SiO2 adakites). HREE and Y depleted patterns suggest the existence of garnet and amphibole as a residue in the source. The source of these rocks was probably garnet-amphibolite possibly generated during subduction of the Neo-Tethyan oceanic slab beneath the Central Iran zone. https://ijp.ui.ac.ir/article_16198_2fddae7eb7744994b6bcb531f0b67a8b.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Geochemistry of Bezow-Daghi volcanic rocks, Urmia adakitic magmatism in the Uromieh-Dokhtar magmatic belt Geochemistry of Bezow-Daghi volcanic rocks, Urmia adakitic magmatism in the Uromieh-Dokhtar magmatic belt 123 140 16199 FA Monir Modjarrad Department of Geology, Faculty of Sciences, Urmia University, Urmia, Iran Journal Article 2016 06 14 The Bezow-Daghi area is located in the west side of Urmia Lake and northeast of Urmia Town. In the area an individual volcanic dome is observed which is accompanied by different pyroclastic and volcanic products (acidic to intermediate composition) mainly dacite. The major minerals are plagioclase and amphibole set in the microlitic to hyaline matrix. Geochemical studies show that the rocks are dacite with high potassic calc-alkaline to shoshonitic affinity. LREE/HREE ratio is high (La N/Yb N≈20). Depletion in HREE, HFSE and TNT contrary to LILE and Sr enrichment and VAG setting are the significant features of these rocks. Detail investigations on the rocks studied confirmed that the dacites are HSA type adakite and its magma is generated as a result of partial melting of subducted slab (eclogite) and overlying sediments during post-collisional period. All geochemical characteristics reported for adakite, in the petrologic literatures, are well consistent with those of Bezow-Daghi adakites i.e. Sr>400 ppm, MgO15% and SiO2>56%, enrichment in LREE and LILE, depletion in HREE and Y and high ratio of La/Yb>20 and Sr/Y>40. The Bezow-Daghi area is located in the west side of Urmia Lake and northeast of Urmia Town. In the area an individual volcanic dome is observed which is accompanied by different pyroclastic and volcanic products (acidic to intermediate composition) mainly dacite. The major minerals are plagioclase and amphibole set in the microlitic to hyaline matrix. Geochemical studies show that the rocks are dacite with high potassic calc-alkaline to shoshonitic affinity. LREE/HREE ratio is high (La N/Yb N≈20). Depletion in HREE, HFSE and TNT contrary to LILE and Sr enrichment and VAG setting are the significant features of these rocks. Detail investigations on the rocks studied confirmed that the dacites are HSA type adakite and its magma is generated as a result of partial melting of subducted slab (eclogite) and overlying sediments during post-collisional period. All geochemical characteristics reported for adakite, in the petrologic literatures, are well consistent with those of Bezow-Daghi adakites i.e. Sr>400 ppm, MgO15% and SiO2>56%, enrichment in LREE and LILE, depletion in HREE and Y and high ratio of La/Yb>20 and Sr/Y>40. https://ijp.ui.ac.ir/article_16199_5113d1df42e4a66939a75055e5c7cc9b.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Petrology and geochemistry of acidic volcanic rocks in the north of Soleiman Bolaghi (southwest Hashtjin, north of Zanjan) with considering perlitization Petrology and geochemistry of acidic volcanic rocks in the north of Soleiman Bolaghi (southwest Hashtjin, north of Zanjan) with considering perlitization 141 158 16203 FA Mir Ali Asghar Mokhtari Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran 0009-0005-1226-5254 Nasir Amel تبریز- جاده ال گلی- فلکه خیام- ساختمان اسکان- بلوک A3 - طبقه سوم- واحد 332 Nasir Amel Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran Sadiqeh Sadri Esfanjani Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran Journal Article 2016 06 14 The studied area is located in the SE of Mianeh and north of Zanjan, and it is a part of Western Alborz- Azarbaijan structural zone. This area consists of volcanic rocks including rhyolite, rhyodacite, dacite and pumiceous tuff with Oligocene age and andesitic lithic tuff with Eocene age. Acidic volcanic rocks crop out in the form of domes, lava flows and tuffs. Perlites crop out in lower part of the rhyolitic- rhyodacitic domes. All acidic rocks have shoshonitic nature and classified as peraluminous rocks. These rocks are characterized by LREE- rich patterns with high LREE/HREE ratio and distinctive negative Eu anomaly. There are distinctive positive anomalies of Rb, Th and Pb on the spider diagrams which is related to continental crust role in genesis and evolution of the parent magma. On the tectonic setting discrimination diagrams, these rocks are plotted within the Post-COLG setting. The overal petrographic, petrologic and geochemical evidences demonstrate that during the final stages of the continental collision, the thickened sub- continental lithosphere in the Alborz was delaminated and replaced by hot asthenosphere mantle. Rapid upwelling of hot asthenosphere gave rise to the partial melting of asthenosphere which is produced the Oligocene basaltic rocks near the studied area. Emplacement of basaltic magma in the upper part of the continental crust led to the partial melting of the crust and generation of the parent magma of the acidic rocks. Acidic lavas cooled rapidly and formed the glassy rocks such as obsidian which changed to perlite in contact with meteoric and warm waters. The studied area is located in the SE of Mianeh and north of Zanjan, and it is a part of Western Alborz- Azarbaijan structural zone. This area consists of volcanic rocks including rhyolite, rhyodacite, dacite and pumiceous tuff with Oligocene age and andesitic lithic tuff with Eocene age. Acidic volcanic rocks crop out in the form of domes, lava flows and tuffs. Perlites crop out in lower part of the rhyolitic- rhyodacitic domes. All acidic rocks have shoshonitic nature and classified as peraluminous rocks. These rocks are characterized by LREE- rich patterns with high LREE/HREE ratio and distinctive negative Eu anomaly. There are distinctive positive anomalies of Rb, Th and Pb on the spider diagrams which is related to continental crust role in genesis and evolution of the parent magma. On the tectonic setting discrimination diagrams, these rocks are plotted within the Post-COLG setting. The overal petrographic, petrologic and geochemical evidences demonstrate that during the final stages of the continental collision, the thickened sub- continental lithosphere in the Alborz was delaminated and replaced by hot asthenosphere mantle. Rapid upwelling of hot asthenosphere gave rise to the partial melting of asthenosphere which is produced the Oligocene basaltic rocks near the studied area. Emplacement of basaltic magma in the upper part of the continental crust led to the partial melting of the crust and generation of the parent magma of the acidic rocks. Acidic lavas cooled rapidly and formed the glassy rocks such as obsidian which changed to perlite in contact with meteoric and warm waters. https://ijp.ui.ac.ir/article_16203_45627fe9c3ad788c1045e2dcf51e6e66.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Mineralogy and geochemistry of granitoids and associated iron skarn of Takht (north of Kaboodar Ahang) Mineralogy and geochemistry of granitoids and associated iron skarn of Takht (north of Kaboodar Ahang) 159 178 16197 FA Mohammad Mostaghimi Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran Farhad Aliani Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran Mohammad Maanijou Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran Ali Asghar Sepahi Gerow Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran Somayeh Mansouri Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran Journal Article 2016 06 14 In structural subdivision of Iran, the Takht area is located in the north of Uromieh-Dokhtar magmatic belt. According to field observations and mineralogical characteristics, the granitoids of Takht consist of granodiorite, quartz-diorite and tonalite. Intrusion of granodiorite into the Cretaceous carbonates produced iron skarn with distinctive zonation. Skarn zonation towards carbonates, include epidote, oligist-quartz, garnet, pyrite, magnetite, crystalline limestone, and carbonate zones, respectively. This distinctive zonation of skarn makes it very attractive. Based on chemical composition of garnets, there is solid solution between grossular and andradite. In spider-diagrams there are depletion of Ti, P and Eu and enrichment of Rb, U and Th LILE enrichment and depletion of HFSE. On Rb/Y+Nb diagram the granitoids of the area are I-type volcanic arc, which can be related to subduction of Neotethys oceanic crust underneath Central zone of Iran. In structural subdivision of Iran, the Takht area is located in the north of Uromieh-Dokhtar magmatic belt. According to field observations and mineralogical characteristics, the granitoids of Takht consist of granodiorite, quartz-diorite and tonalite. Intrusion of granodiorite into the Cretaceous carbonates produced iron skarn with distinctive zonation. Skarn zonation towards carbonates, include epidote, oligist-quartz, garnet, pyrite, magnetite, crystalline limestone, and carbonate zones, respectively. This distinctive zonation of skarn makes it very attractive. Based on chemical composition of garnets, there is solid solution between grossular and andradite. In spider-diagrams there are depletion of Ti, P and Eu and enrichment of Rb, U and Th LILE enrichment and depletion of HFSE. On Rb/Y+Nb diagram the granitoids of the area are I-type volcanic arc, which can be related to subduction of Neotethys oceanic crust underneath Central zone of Iran. https://ijp.ui.ac.ir/article_16197_5c6b8fe4ee86f4b580496929cfce37f9.pdf

University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Mineralogy, petrogenesis and tectonic setting interpretation of Kuh-e-Sarhangi area granites (northwest of Lut block) Mineralogy, petrogenesis and tectonic setting interpretation of Kuh-e-Sarhangi area granites (northwest of Lut block) 179 199 16196 FA Ali Yasaghi Department of Geology, School of Basic Sciences, Tarbiat Modares University, Tehran, Iran Mohsen Nasrabady گروه زمین شناسی دانشگده علوم پایه دانشگاه بین المللی امام خمینی Mohammad Mohajjel Department of Geology, School of Basic Sciences, Tarbiat Modares University, Tehran, Iran Journal Article 2016 06 14 Numerous granitic bodies have been injected into the Precambrian basement of Central Iran in Kuh-e-Sarhangi area. Microscopic investigations and mineral chemistry point to the existence of white mica, biotite and epidote as primary (magmatic) and secondary (alteration) or re-equilibrated types. The important mineralogical indicators such as the presence of two separate feldspars and the existence of spessartine-poor garnet and magmatic epidote indicate magma crystallization at relatively high depths. Whole rock and mineral geochemical evidences of these bodies show granitic composition, with calc-alkaline characteristics and weak per-aluminous nature. In discrimination diagrams, the studied granites are I-type belonging to volcanic arc. The spider diagrams pattern of these granites are resemble to the subduction zone magma. There is considerable compositional overlap of rare earth and trace elements patterns of Kuh-e-Sarhangi granites and continental active margin of southern Andes. Considering of continental active margin setting for Central Iran in upper Precambrian-lower Cambrian is the involvement of this micro continent setting in the northern edge of Gondwana and subduction of Prototethys oceanic basin underneath it. The existence of some anorogenic intrusion bodies with mineralogical and whole rock alkaline characteristics in this area is probably related to the extensional basins of back arc or the influence of deep lithospheric faults. Numerous granitic bodies have been injected into the Precambrian basement of Central Iran in Kuh-e-Sarhangi area. Microscopic investigations and mineral chemistry point to the existence of white mica, biotite and epidote as primary (magmatic) and secondary (alteration) or re-equilibrated types. The important mineralogical indicators such as the presence of two separate feldspars and the existence of spessartine-poor garnet and magmatic epidote indicate magma crystallization at relatively high depths. Whole rock and mineral geochemical evidences of these bodies show granitic composition, with calc-alkaline characteristics and weak per-aluminous nature. In discrimination diagrams, the studied granites are I-type belonging to volcanic arc. The spider diagrams pattern of these granites are resemble to the subduction zone magma. There is considerable compositional overlap of rare earth and trace elements patterns of Kuh-e-Sarhangi granites and continental active margin of southern Andes. Considering of continental active margin setting for Central Iran in upper Precambrian-lower Cambrian is the involvement of this micro continent setting in the northern edge of Gondwana and subduction of Prototethys oceanic basin underneath it. The existence of some anorogenic intrusion bodies with mineralogical and whole rock alkaline characteristics in this area is probably related to the extensional basins of back arc or the influence of deep lithospheric faults. https://ijp.ui.ac.ir/article_16196_1b3531a8bf3a26e8bfb0ebf2704a5d35.pdf