University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Using whole rock and mineral chemistry for determining the origin of lamprophyres from Deh-Bazargan-Sarasiab 6 (north of erman city, Kerman Province) Using whole rock and mineral chemistry for determining the origin of lamprophyres from Deh-Bazargan-Sarasiab 6 (north of erman city, Kerman Province) 1 20 22391 10.22108/ijp.2018.22391 FA Gholamreza Ghadami Department of Geology, Faculty of Science, University of Hormozgan, Hormozgan, Iran Armin Bahrampour Department of Geology, Faculty of Science, Shahid Bahonar University, Kerman, Iran Habibe Atapour Department of Mining Engineering, Faculty of Engineering, Shahid Bahonar University, Kerman, Iran Mohammad Poosti Department of Geology, Faculty of Science, University of Hormozgan, Hormozgan, Iran Hamid Ahmadipour Department of Geology, Faculty of Science, Shahid Bahonar University, Kerman, Iran Journal Article 2016 10 30 In the north of Kerman city, between Deh-Bazargan and Sarasiab 6 villages and along the Koohbanan fault, several lamprophyric dykes have been intruded the Shemshak, Bidu and Hodjedk Formations. The dykes show porphyry and glomeroporphyry textures and contain coarse-grained phenocrysts of olivine (30 vol.%), pyroxene (20 vol.%) and amphibole (5 vol.%) crystals in a matrix containing 10 vol.% plagioclase and sanidine microlites, fine-grained pyroxene (20 vol.%) and amphiboles (5 vol.%). Electron microprobe analyses show that the pyroxenes are diopside (Fs_7.84-15.11)-)Wo_42.20-46.75)-)En_41.57-49.24), olivines are chrysolite (Fo_85/79-91.20), plagioclases are labradorite (An_50.94-66.30) and opaque inclusions in olivines are chrome-spinel (Cr_1.3-1.25)-(Fe_0.708-0.548)-(Al_0.518-0.433). Petrographical evidences such as lack of coarse-grained felsic minerals, the presence of porphyritic texture and the co-existence of coarse-grained pyroxene, olivine and amphibole minerals as well as the similar oxides contents of SiO₂ (44.25-46.435 wt.%), MgO (5.81-19.125 wt.%), Na₂O (1.55-2.035 wt.%), K₂O (1.18-1.715 wt.%) to the average of the well-known alkaline lamprophyres (SiO₂=42.5 wt.%, MgO=7.25 wt.%, Na₂O=35 wt.%, K₂O=25 wt.%), suggest that the studied dykes are similar to the alkaline lamprophyres (monchiquites) rather than calcalkaline spessartites. Thermo-barometric studies of pyroxenes show that the rocks under discussion have been formed under pressure of 5-10 Kb and temperature of 700-900 ºC with less than 10 percent water contents. Whole rock chemical analyses of the studied lamprophyres indicate that the parent magmas were alkaline type and originated from a metasomatized spinel-garnet-lhezrolite mantle source containing hydrous minerals, then they were emplaced in a post-collisional arc setting. In the north of Kerman city, between Deh-Bazargan and Sarasiab 6 villages and along the Koohbanan fault, several lamprophyric dykes have been intruded the Shemshak, Bidu and Hodjedk Formations. The dykes show porphyry and glomeroporphyry textures and contain coarse-grained phenocrysts of olivine (30 vol.%), pyroxene (20 vol.%) and amphibole (5 vol.%) crystals in a matrix containing 10 vol.% plagioclase and sanidine microlites, fine-grained pyroxene (20 vol.%) and amphiboles (5 vol.%). Electron microprobe analyses show that the pyroxenes are diopside (Fs_7.84-15.11)-)Wo_42.20-46.75)-)En_41.57-49.24), olivines are chrysolite (Fo_85/79-91.20), plagioclases are labradorite (An_50.94-66.30) and opaque inclusions in olivines are chrome-spinel (Cr_1.3-1.25)-(Fe_0.708-0.548)-(Al_0.518-0.433). Petrographical evidences such as lack of coarse-grained felsic minerals, the presence of porphyritic texture and the co-existence of coarse-grained pyroxene, olivine and amphibole minerals as well as the similar oxides contents of SiO₂ (44.25-46.435 wt.%), MgO (5.81-19.125 wt.%), Na₂O (1.55-2.035 wt.%), K₂O (1.18-1.715 wt.%) to the average of the well-known alkaline lamprophyres (SiO₂=42.5 wt.%, MgO=7.25 wt.%, Na₂O=35 wt.%, K₂O=25 wt.%), suggest that the studied dykes are similar to the alkaline lamprophyres (monchiquites) rather than calcalkaline spessartites. Thermo-barometric studies of pyroxenes show that the rocks under discussion have been formed under pressure of 5-10 Kb and temperature of 700-900 ºC with less than 10 percent water contents. Whole rock chemical analyses of the studied lamprophyres indicate that the parent magmas were alkaline type and originated from a metasomatized spinel-garnet-lhezrolite mantle source containing hydrous minerals, then they were emplaced in a post-collisional arc setting. https://ijp.ui.ac.ir/article_22391_ff8007fdac095ec40b6fc2dcdce26749.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Geochemical-metallogenic evolution of Agh-Daragh igneous rocks (north of Ahar) links to Cu-Au±W occurrences Geochemical-metallogenic evolution of Agh-Daragh igneous rocks (north of Ahar) links to Cu-Au±W occurrences 21 44 22392 10.22108/ijp.2017.100426.0 FA Heydar Asgharzadeh-asl Department of Geochemistry, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran Ebrahim Tale Fazel Department of Geochemistry, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran Behzad Mehrabi Department of Geology, Bu-Ali Sina University, Hamedan, Iran Fariborz Masoudi Department of Geology, Faculty of Earth sciences, University of Shahid Beheshti, Tehran, Iran Journal Article 2016 10 24 The Agh-Daragh study area in the north of Ahar is located in Ahar-Arasbaran zone. The area is distinguished by W, Cu and Au metal endowment and has been explored during stream sediment and heavy mineral exploration. At least, three mineral occurrences are detected in Agh-Daragh area including Cu stockwork-disseminated mineralization in Chupanlar (occurred in O^mz quartz-monzonite), Cu-Au±W vein-type mineralization in Ayran Goli (occurred in O^g granodiorite), and Fe±Cu skarn in Gowdal (occurred between quartz-monzonite unit and crystallized carbonate). Chemically, Agh-Daragh mineralization-related metaluminous granitoids belong to oxidized, I-type and high-K calc-alkaline to shoshonitic series. They have SiO₂ = 63.5–67.6 wt%, Al₂O₃ = 14–16.5 wt%, and K₂O/Na₂O = 0.5–1.8. Moreover, LILE enrichment relative to HFSE depletion and HREE in the granitoids and the dikes occurred due to fluid-melt interaction, which are characteristics of subduction tectonic environment. In their magmatic evolution, the Agh-Daragh intrusive rocks underwent a transition from the early intrusive phases belonging to granodiorite (O^g unit) with low K/Na and Fe₂O₃/FeO ratios and to the late intrusive phases belonging to quartz-monzonite (O^mz unit) enriched in K (K/Na >1) and oxidized (Fe₂O₃/FeO >1). It seems that high content of volatiles in high-K and oxygenate magmas occurs due to saturation of magmatic melt in water under a lower degree of quartz-monzonite crystallization immediately preceding Cu-Au±W mineralization at Agh-Daragh intrusive suite. Combining our field geology and geochemical-metallogenic evidences, we conclude that the mineralization in Agh-Daragh area mostly occurred in accompany with late quartz-monzonite stocks; as a result, identification of high-K intrusive rocks and related dikes have important implications for proceeding exploration planning specially indicating of drilling points, and further refines the basis for mineral exploration in Sheyviar Dagh intrusive suite and subsequently in Ahar-Arasbaran metallogenic zone. The Agh-Daragh study area in the north of Ahar is located in Ahar-Arasbaran zone. The area is distinguished by W, Cu and Au metal endowment and has been explored during stream sediment and heavy mineral exploration. At least, three mineral occurrences are detected in Agh-Daragh area including Cu stockwork-disseminated mineralization in Chupanlar (occurred in O^mz quartz-monzonite), Cu-Au±W vein-type mineralization in Ayran Goli (occurred in O^g granodiorite), and Fe±Cu skarn in Gowdal (occurred between quartz-monzonite unit and crystallized carbonate). Chemically, Agh-Daragh mineralization-related metaluminous granitoids belong to oxidized, I-type and high-K calc-alkaline to shoshonitic series. They have SiO₂ = 63.5–67.6 wt%, Al₂O₃ = 14–16.5 wt%, and K₂O/Na₂O = 0.5–1.8. Moreover, LILE enrichment relative to HFSE depletion and HREE in the granitoids and the dikes occurred due to fluid-melt interaction, which are characteristics of subduction tectonic environment. In their magmatic evolution, the Agh-Daragh intrusive rocks underwent a transition from the early intrusive phases belonging to granodiorite (O^g unit) with low K/Na and Fe₂O₃/FeO ratios and to the late intrusive phases belonging to quartz-monzonite (O^mz unit) enriched in K (K/Na >1) and oxidized (Fe₂O₃/FeO >1). It seems that high content of volatiles in high-K and oxygenate magmas occurs due to saturation of magmatic melt in water under a lower degree of quartz-monzonite crystallization immediately preceding Cu-Au±W mineralization at Agh-Daragh intrusive suite. Combining our field geology and geochemical-metallogenic evidences, we conclude that the mineralization in Agh-Daragh area mostly occurred in accompany with late quartz-monzonite stocks; as a result, identification of high-K intrusive rocks and related dikes have important implications for proceeding exploration planning specially indicating of drilling points, and further refines the basis for mineral exploration in Sheyviar Dagh intrusive suite and subsequently in Ahar-Arasbaran metallogenic zone. https://ijp.ui.ac.ir/article_22392_447fbb0ee357ce91b2325020bf5f1467.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Contribution of ultramafic rocks in central Sanandaj-Sirjan zone to the characterizing of physio-chemical condition during initiation of subduction Contribution of ultramafic rocks in central Sanandaj-Sirjan zone to the characterizing of physio-chemical condition during initiation of subduction 45 66 22393 10.22108/ijp.2017.100430.0 FA Amir Esna-Ashari Department of Geology, Payame Noor University, 19395-3697 Tehran, I. R. of Iran Fatemeh Sarjoughian Department of Earth Sciences, Faculty of Sciences, University of Kurdistan, Sanandaj, Iran Journal Article 2016 11 12 In the central part of the Sanandaj-Sirjan zone, there is an ultramafic rock exposure (hornblendite and pyroxenite) adjacent to Molataleb felsic complex completely located between Azna and Aligoodarz towns. The ultramafic rocks are actually cumulates derived from boninitic magma. During Upper Triassic-Lower Jurassic time the boninitic magma has been originated from mantle wedge as the result of initiation of Neo-Tethys subduction. Later, when subduction was proceeding, the felsic rocks crystallized in Middle Jurassic. Major elements composition of olivine, pyroxene, amphibole and minor plagioclase from the ultramafic rocks reveals crystallization from a sub-alkaline to calc-alkaline magma in a subduction zone setting. Primary minerals have chemical characteristics typical of those derived from a magma with low oxygen fugacity. Different methods for minerals thermobarometry indicate that amphiboles crystallized in relatively low temperature (880°C) but crystallization condition of other minerals corresponds to higher temperatures (1000-1200°c). They were crystallized at pressure condition equal to 5.85 kbar corresponding to the depth of ~17 km. It is not common that a mantle wedge at the depth of ~17 km to be affected by such high thermal gradient during the normal subduction process. Asthenospheric flow around the subducting slab edge during subduction initiation can explain high thermal gradient prevailed the infant mantle wedge. This mechanism corresponds to the boninitic nature of the ultramafic rocks. In the central part of the Sanandaj-Sirjan zone, there is an ultramafic rock exposure (hornblendite and pyroxenite) adjacent to Molataleb felsic complex completely located between Azna and Aligoodarz towns. The ultramafic rocks are actually cumulates derived from boninitic magma. During Upper Triassic-Lower Jurassic time the boninitic magma has been originated from mantle wedge as the result of initiation of Neo-Tethys subduction. Later, when subduction was proceeding, the felsic rocks crystallized in Middle Jurassic. Major elements composition of olivine, pyroxene, amphibole and minor plagioclase from the ultramafic rocks reveals crystallization from a sub-alkaline to calc-alkaline magma in a subduction zone setting. Primary minerals have chemical characteristics typical of those derived from a magma with low oxygen fugacity. Different methods for minerals thermobarometry indicate that amphiboles crystallized in relatively low temperature (880°C) but crystallization condition of other minerals corresponds to higher temperatures (1000-1200°c). They were crystallized at pressure condition equal to 5.85 kbar corresponding to the depth of ~17 km. It is not common that a mantle wedge at the depth of ~17 km to be affected by such high thermal gradient during the normal subduction process. Asthenospheric flow around the subducting slab edge during subduction initiation can explain high thermal gradient prevailed the infant mantle wedge. This mechanism corresponds to the boninitic nature of the ultramafic rocks. https://ijp.ui.ac.ir/article_22393_1786404167b8075c17f8fc85e9bc121a.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Characterization of potassic alteration in the Iju porphyry copper deposit using mineral chemistry of biotite and chlorite Characterization of potassic alteration in the Iju porphyry copper deposit using mineral chemistry of biotite and chlorite 67 86 22394 10.22108/ijp.2017.82012.0 FA Alireza Zarasvandi Department of Geology, Faculty of Earth Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran Mohsen Rezaei Department of Geology, Faculty of Earth Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran Houshang Pourkaseb Department of Geology, Faculty of Earth Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran Sina Asadi Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, Iran Amir Mortaza Azimzadeh Department of Geology, Faculty of Science, University of Zanjan, Iran Journal Article 2016 07 27 The Iju porphyry copper deposit is located 72 km NE of Shahr-e- Babak in the western part of the Dehaj - Sardueih zone in the Kerman Cenozoic volcano - plutonic belt. In this deposit, the Miocene granitoids with dominant composition of granite, granodiorite, tonalite and quartz diorite were intruded in the Eocene volcanic and pyroclastic sequences. The potassic, propylitic, potassic-phyllic, phyllic and argillic facies are the main hydrothermal alterations in the Iju intrusive masses. Nevertheless, the hypogene mineralization is manly occurred in the potassic alteration. The aim of present work is the investigation of reequilibrated biotite and chlorite chemistry to characterize the potassic alteration in the onset of mineralization. Also, the chlorite data is used for assessing the geochemical changes owing to chloritization of biotite. Based on reequilibrated biotites, it is proved that oxygen fugacity during the potassic alteration was high so that mostly belongs to the hematite- magnetite buffering district. Moreover, the temperature in the onset of sulphide mineralization has an average of 399.85 °C. According to variations in Log (<em>f</em>H₂O/<em>f</em>HF) and Log (<em>f</em>H₂O/<em>f</em>HCl) values, it seems that non-homogenous hydrothermal fluids were contributed in the formation of potassic alteration in the Iju deposit. Secondary chlorites that replaced biotite have clinochlore composition and chloritization occurred around 325.48 to 373.51 °C. The chloritization process lead to Mg increasing as well as significant K₂O and SiO₂ decreasing contents due to the formation of K-feldspar minerals. Overall, it seems that high temperatures and the prevailing of high oxygen fugacity could be considered as one of main reasons for the low sulphide mineralization and the sub-economic nature of the Iju porphyry deposit. The Iju porphyry copper deposit is located 72 km NE of Shahr-e- Babak in the western part of the Dehaj - Sardueih zone in the Kerman Cenozoic volcano - plutonic belt. In this deposit, the Miocene granitoids with dominant composition of granite, granodiorite, tonalite and quartz diorite were intruded in the Eocene volcanic and pyroclastic sequences. The potassic, propylitic, potassic-phyllic, phyllic and argillic facies are the main hydrothermal alterations in the Iju intrusive masses. Nevertheless, the hypogene mineralization is manly occurred in the potassic alteration. The aim of present work is the investigation of reequilibrated biotite and chlorite chemistry to characterize the potassic alteration in the onset of mineralization. Also, the chlorite data is used for assessing the geochemical changes owing to chloritization of biotite. Based on reequilibrated biotites, it is proved that oxygen fugacity during the potassic alteration was high so that mostly belongs to the hematite- magnetite buffering district. Moreover, the temperature in the onset of sulphide mineralization has an average of 399.85 °C. According to variations in Log (<em>f</em>H₂O/<em>f</em>HF) and Log (<em>f</em>H₂O/<em>f</em>HCl) values, it seems that non-homogenous hydrothermal fluids were contributed in the formation of potassic alteration in the Iju deposit. Secondary chlorites that replaced biotite have clinochlore composition and chloritization occurred around 325.48 to 373.51 °C. The chloritization process lead to Mg increasing as well as significant K₂O and SiO₂ decreasing contents due to the formation of K-feldspar minerals. Overall, it seems that high temperatures and the prevailing of high oxygen fugacity could be considered as one of main reasons for the low sulphide mineralization and the sub-economic nature of the Iju porphyry deposit. https://ijp.ui.ac.ir/article_22394_240a5287c1395e5ed59188b1df050785.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Geochronology and Lu-Hf isotope of mafic-intermediate rocks from SW Salmas: implication for Neoproterozoic juvenile melts Geochronology and Lu-Hf isotope of mafic-intermediate rocks from SW Salmas: implication for Neoproterozoic juvenile melts 87 104 22395 10.22108/ijp.2017.100425.0 FA Fahime Kozekoulani Department of geology, Factulaty of Earth sciences, University of Shahid Beheshti, Tehran,Iran Mohammad Rahgoshay Department of geology, Factulaty of Earth sciences, University of Shahid Beheshti, Tehran,Iran Hadi Shafaii Moghadam Department of geology, Factulaty of Earth sciences, University of Damghan, Damghan,Iran Journal Article 2016 10 20 The southwest Salmas metamorphosed mafic-intermediate intrusive rocks are located in Sanandaj-Sirjan zone in NW of Iran. The metamorphosed intrusives rocks comprise metagabbro and metadiorite that intruded the Precambrian metamorphosed volcanic-sedimentary rocks. U-Pb zircon dating of two samples of metagabbro rocks yielded age of Ca. 548/7±2/5 Ma to 553/1±7/0 Ma and one sample of metadiorite rock yielded age of 542±6/5 Ma (late Neoproterozoic-Cambrian). Based on the obtained geochemical results, these rocks were crystallized from subduction-related melts.The ɛHf(t) values of these rocks are variable from +6/2 to +14/16. Hf model ages of mafic-intermediate rocks from the SW Salmas show values of 593-1000 Ma (Neoproterozoic). U-Pb zircon dating and Hf isotope results indicate that late Neoproterozoic-Cambrian metamorphosed mafic-intermediate intrusive rocks in the northwest of Iran were related to widespread magmatism (Cadomian magmatism) along the northern margin of Gondwana. The southwest Salmas metamorphosed mafic-intermediate intrusive rocks are located in Sanandaj-Sirjan zone in NW of Iran. The metamorphosed intrusives rocks comprise metagabbro and metadiorite that intruded the Precambrian metamorphosed volcanic-sedimentary rocks. U-Pb zircon dating of two samples of metagabbro rocks yielded age of Ca. 548/7±2/5 Ma to 553/1±7/0 Ma and one sample of metadiorite rock yielded age of 542±6/5 Ma (late Neoproterozoic-Cambrian). Based on the obtained geochemical results, these rocks were crystallized from subduction-related melts.The ɛHf(t) values of these rocks are variable from +6/2 to +14/16. Hf model ages of mafic-intermediate rocks from the SW Salmas show values of 593-1000 Ma (Neoproterozoic). U-Pb zircon dating and Hf isotope results indicate that late Neoproterozoic-Cambrian metamorphosed mafic-intermediate intrusive rocks in the northwest of Iran were related to widespread magmatism (Cadomian magmatism) along the northern margin of Gondwana. https://ijp.ui.ac.ir/article_22395_03df3d8201b2bb381258226f56b7260e.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Petrology and the effects of dynamic processes on the felsic rocks in the Darvazeh plutonic body (South Qorveh- Kurdistan) Petrology and the effects of dynamic processes on the felsic rocks in the Darvazeh plutonic body (South Qorveh- Kurdistan) 105 126 22396 10.22108/ijp.2017.103624.1027 FA Ashraf Torkian Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran Tahereh Molaei Yeganeh 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 Journal Article 2017 04 23 The Darvazeh pluton is located in the south of Qorveh. Olivine gabbro, diorite, quartz monzonite and granite rocks are rock forming of this body, but this paper is focused on the leucocratic to mesocratic rocks (quartz monzonitic and granitic rocks). These rocks were effected by dynamic tectonic activity during the intrusion and according to the distance of shear zone; deformation can be classified to cataclastic, protomylonite and mylonite. Microstructure evidences including the presence of porphyroclasts, bending of crystals and their twining, myrmekitic and pertite textures which caused by stress. Based on the microstructure features, deformations occurred at temperature of about 500-600 ° C. The geochemical data suggested that the felsic rocks belong to calc-alkaline, ferroan, I-type and metaluminous to slightly peraluminous series. Enrichment in LREE/HREE; negative anomalies of Ba, Ti, P, Sr, Nb and U, Th, Pb positive anomalies and Th/Ta ratios indicate continental arc setting. The presence of mafic enclaves, high volume of granite and negative trend of Zr versus SiO₂, all suggest that the felsic rocks were generated via partial melting process. According to geochemical characteristics, the studied granitoid was originated by partial melting of meta basaltic rocks in the lower crust. The Darvazeh pluton is located in the south of Qorveh. Olivine gabbro, diorite, quartz monzonite and granite rocks are rock forming of this body, but this paper is focused on the leucocratic to mesocratic rocks (quartz monzonitic and granitic rocks). These rocks were effected by dynamic tectonic activity during the intrusion and according to the distance of shear zone; deformation can be classified to cataclastic, protomylonite and mylonite. Microstructure evidences including the presence of porphyroclasts, bending of crystals and their twining, myrmekitic and pertite textures which caused by stress. Based on the microstructure features, deformations occurred at temperature of about 500-600 ° C. The geochemical data suggested that the felsic rocks belong to calc-alkaline, ferroan, I-type and metaluminous to slightly peraluminous series. Enrichment in LREE/HREE; negative anomalies of Ba, Ti, P, Sr, Nb and U, Th, Pb positive anomalies and Th/Ta ratios indicate continental arc setting. The presence of mafic enclaves, high volume of granite and negative trend of Zr versus SiO₂, all suggest that the felsic rocks were generated via partial melting process. According to geochemical characteristics, the studied granitoid was originated by partial melting of meta basaltic rocks in the lower crust. https://ijp.ui.ac.ir/article_22396_772d1f0e9f06468d079043e286070f57.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Petrology of volcanic rocks from Khan- Ghohestan area (Northeast of Birjand, East of Iran) Petrology of volcanic rocks from Khan- Ghohestan area (Northeast of Birjand, East of Iran) 127 144 22417 10.22108/ijp.2017.102314.1016 FA Mohammad Hossein Yousefzadeh Department of Geology, Faculty of Science, University of Birjand, Birjand, Iran Fatemeh Fanoodi Department of Geology, Faculty of Science, University of Birjand, Birjand, Iran Golamreza Fotoohirad Department of Mining Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran Journal Article 2017 02 07 The Tertiary volcanic rocks in the Khan area have vast outcrops and alternatively include of lava and pyroclastic rocks. The composition of most lavas are dacite, andesite and basaltic trachyandsite with medium potassium calc-alkaline nature. The most phenocrysts in these rocks include oscillatory chemical zonal plagioclases with andesine to oligoclase composition, hornblende, pyroxene, and quartz with apatite as a common accessory mineral. The most important textures of these rocks are porphyritic with microgranular and microlitic matrix, glomeroporphyritic, flow and vesicular. The essential mineral textures are sieve, gulf corrosion and zoning, which point to inequilibrium and magma mixing processes during magma ascension. Depletion of Ti and Nb of these rocks can be indication of magmatism of subduction zone.Nb negative anomaly in the rocks under study is indicator of continental rocks and may be related to crustal involvement in magmatic processes. Based on normalized spider diagrams for rare and rare earth elements, depletion of incompatible elements with high ionic potential such as Ti, Nb, P and Zr in the studied samples can be attributed to magmatism of subduction zone and may be ascribed to the presence of an enriched and metasomatized mantle source by subduction processes and also the occurrence of amphibole and high oxygen fugacity in the magma. Based on the interpretation of tectono-magmatic diagrams, the study volcanic rocks are related to active continental margin subduction zone. The Tertiary volcanic rocks in the Khan area have vast outcrops and alternatively include of lava and pyroclastic rocks. The composition of most lavas are dacite, andesite and basaltic trachyandsite with medium potassium calc-alkaline nature. The most phenocrysts in these rocks include oscillatory chemical zonal plagioclases with andesine to oligoclase composition, hornblende, pyroxene, and quartz with apatite as a common accessory mineral. The most important textures of these rocks are porphyritic with microgranular and microlitic matrix, glomeroporphyritic, flow and vesicular. The essential mineral textures are sieve, gulf corrosion and zoning, which point to inequilibrium and magma mixing processes during magma ascension. Depletion of Ti and Nb of these rocks can be indication of magmatism of subduction zone.Nb negative anomaly in the rocks under study is indicator of continental rocks and may be related to crustal involvement in magmatic processes. Based on normalized spider diagrams for rare and rare earth elements, depletion of incompatible elements with high ionic potential such as Ti, Nb, P and Zr in the studied samples can be attributed to magmatism of subduction zone and may be ascribed to the presence of an enriched and metasomatized mantle source by subduction processes and also the occurrence of amphibole and high oxygen fugacity in the magma. Based on the interpretation of tectono-magmatic diagrams, the study volcanic rocks are related to active continental margin subduction zone. https://ijp.ui.ac.ir/article_22417_ed90f0e04831e3d609568c02e948617d.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Whole-rock chemistry of isotropic gabbros from the Kermanshah ophiolite: Evidence for petrological and source region characteristics of ophiolitic and it's tectonic setting Whole-rock chemistry of isotropic gabbros from the Kermanshah ophiolite: Evidence for petrological and source region characteristics of ophiolitic and it's tectonic setting 145 166 22467 10.22108/ijp.2018.105479.1041 FA Farhad Aliani Bu -Ali Sina University Zeinab Daraeezadeh Department of Geology, faculty of science, Bu -Ali Sina University, Hamedan, Iran Journal Article 2017 07 20 The isotropic gabbros of Kermanshah ophiolite are mainly represented by, gabbro, leucogabbro, olivine gabbro, gabbronorite, olivine gabbronorite and Troctolite. The gabbros are medium grained with euhedral to subhedral plagioclase, subhedral orthopyroxenes and clinopyroxenes, olivine and together with rare amphiboles. The gabbros are characterized by high contents of MgO, CaO and low TiO2, K2O, P2O5, Zr and Y. The geochemical signature of the gabbros indicates tholeiitic affinity for the protolith, with magma generation in island arc-setting. N-MORB and primitive mantle normalized multielement patterns of the gabbros show flat patterns for HFS-elements and depletion in (P, Zr, Sm, Ti, and Y) and enrichment of LIL-elements (Ba, Rb, K, Th, Sr) with negative Nb anomalies suggesting involvement of subduction component in the depleted mantle source and formation in a supra-subduction zone tectonic setting. REEs exhibiting flat to slightly depleted LREE patterns, geochemically similar to island arc tholeiites. In general, isotropic gabbros have transitional characteristics between mid-ocean ridge basalt and island-arc tholeiite on discrimination tectonomagmatic diagrams. It is therefore proposed that these gabbros may have originated in a back-arc basin tectonic setting. The isotropic gabbros of Kermanshah ophiolite are mainly represented by, gabbro, leucogabbro, olivine gabbro, gabbronorite, olivine gabbronorite and Troctolite. The gabbros are medium grained with euhedral to subhedral plagioclase, subhedral orthopyroxenes and clinopyroxenes, olivine and together with rare amphiboles. The gabbros are characterized by high contents of MgO, CaO and low TiO2, K2O, P2O5, Zr and Y. The geochemical signature of the gabbros indicates tholeiitic affinity for the protolith, with magma generation in island arc-setting. N-MORB and primitive mantle normalized multielement patterns of the gabbros show flat patterns for HFS-elements and depletion in (P, Zr, Sm, Ti, and Y) and enrichment of LIL-elements (Ba, Rb, K, Th, Sr) with negative Nb anomalies suggesting involvement of subduction component in the depleted mantle source and formation in a supra-subduction zone tectonic setting. REEs exhibiting flat to slightly depleted LREE patterns, geochemically similar to island arc tholeiites. In general, isotropic gabbros have transitional characteristics between mid-ocean ridge basalt and island-arc tholeiite on discrimination tectonomagmatic diagrams. It is therefore proposed that these gabbros may have originated in a back-arc basin tectonic setting. https://ijp.ui.ac.ir/article_22467_0e767240ec8fcb73c771b7aa601b1aa6.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Study of iron mineralization in Tekieh Bala iron index, based on mineralogical and geochemical evidence Study of iron mineralization in Tekieh Bala iron index, based on mineralogical and geochemical evidence 167 196 22468 10.22108/ijp.2017.81995.0 FA Mehrdad Barati Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran Zahra Ghilzar Khojasteh Shool of Geology, Faculty of science, University of Tehran, Tehran, Iran Meisam Gholipoor School of Geology, Faculty of science, University of Tehran, Tehran, Iran Journal Article 2016 05 17 Abstract<br /> The Tekieh Bala iron index is located in the south east of Kordestan province in Sanandaj- Sirjan geotectonic zone. Exposed rocks at the study area are including granite, gabbro, diorite, quartzmonzonite, quartzmonzodiorite and actinolite schist to chlorite schist.Orebody is located in the fault-beratited zone. Magnetite, hematite, goethite, limonite and pyrite included iron minerals in this index. Epidotization, chloritization, sericitization, actinolitization and silicification are the main alteration around the orebody. Geochemical studies of major and trace elements from the magnetite ore and use of diagrams provided by the various researchers shows that this index placed in group of iron oxide deposits, IOA sub-type and IOCG-type. REE Studies have shown, patterns of these elements, and calculated differential parameters emphasize the similarity of this deposit and IOA-type. Ore forming fluids were formed in differentiation and crystalization of intermediate intrusions rocks as a iron-rich hydrothermal fluids, mixing with the meteoric waters has been led to change in the environmental conditions and deposition of orebody. Abstract<br /> The Tekieh Bala iron index is located in the south east of Kordestan province in Sanandaj- Sirjan geotectonic zone. Exposed rocks at the study area are including granite, gabbro, diorite, quartzmonzonite, quartzmonzodiorite and actinolite schist to chlorite schist.Orebody is located in the fault-beratited zone. Magnetite, hematite, goethite, limonite and pyrite included iron minerals in this index. Epidotization, chloritization, sericitization, actinolitization and silicification are the main alteration around the orebody. Geochemical studies of major and trace elements from the magnetite ore and use of diagrams provided by the various researchers shows that this index placed in group of iron oxide deposits, IOA sub-type and IOCG-type. REE Studies have shown, patterns of these elements, and calculated differential parameters emphasize the similarity of this deposit and IOA-type. Ore forming fluids were formed in differentiation and crystalization of intermediate intrusions rocks as a iron-rich hydrothermal fluids, mixing with the meteoric waters has been led to change in the environmental conditions and deposition of orebody. https://ijp.ui.ac.ir/article_22468_a8f17d867753d2fd42481c615c2871c1.pdf

University of Isfahan Petrological Journal 2228-5210 8 32 2018 02 20 Geochemistry and zeolitization of tuffs in Zarrin Dasht mining area (Firuzkuh, Central Alborz) Geochemistry and zeolitization of tuffs in Zarrin Dasht mining area (Firuzkuh, Central Alborz) 197 212 22241 10.22108/ijp.2017.81982.0 FA Zahra Mehrpooya Department of geology, Faculty of Sciences, University of Tehran, Tehran, Iran Faramarz Tutti Department of Geology, Faculty of Sciences, University of Tehran, Tehran, Iran Kazem Kazemi Department of Geology, Faculty of Sciences, University of Tehran, Tehran, Iran Mohammad Ali Barghi Department of geology, Faculty of Sciences, University of Tehran, Tehran, Iran Journal Article 2016 02 13 The Zarrin Dasht region is located in Tehran province, between Damavand and Firuzkuh cities. This region with 10 Km2 area belongs to Central-Alborz zone. On the base of petrographic and geochemical studies, the volcaniclastic rocks of the Zarrin Dasht area are trachyte, dacite, rhyodacite and rhyolite. Petrographic evidence as well as XRD analyses point to the presence of glass and crystallization quartz, clinoptilolite, analcime, natrolite, heulandite, montmorillonite, kaolinite, illite and chlorite. Texture of tuffs is vitrophyric. Based on the geochemical data, these rocks are calk-alkaline and metaluminous to peraluminous composition. Primitive mantle-normalized and chondrite-normalized trace elements and rare earth elements patterns indicate enrichment in LREE and LILE and depletion in HREE and HFSE with pronounced negative anomalies in Eu, Ba, Nb, Ti, Sr and P in the Zarrin Dasht samples. Samples position on the various tectonic setting discrimination diagrams demonstrate that these rocks were formed in environment related to subduction in active continental margins. Chlorites, are present in the rock context and also relatively filled cavities as amygdaloidal, while analcime was mainly distributed in the rock context. It seems these minerals are the result of recrystallization of volcanic glasses such as shard in the rock. Secondary minerals can be considered as a burial diagenesis and low-grade metamorphism in the studied tuffs that occurred under the upper floor pressure. The Zarrin Dasht region is located in Tehran province, between Damavand and Firuzkuh cities. This region with 10 Km2 area belongs to Central-Alborz zone. On the base of petrographic and geochemical studies, the volcaniclastic rocks of the Zarrin Dasht area are trachyte, dacite, rhyodacite and rhyolite. Petrographic evidence as well as XRD analyses point to the presence of glass and crystallization quartz, clinoptilolite, analcime, natrolite, heulandite, montmorillonite, kaolinite, illite and chlorite. Texture of tuffs is vitrophyric. Based on the geochemical data, these rocks are calk-alkaline and metaluminous to peraluminous composition. Primitive mantle-normalized and chondrite-normalized trace elements and rare earth elements patterns indicate enrichment in LREE and LILE and depletion in HREE and HFSE with pronounced negative anomalies in Eu, Ba, Nb, Ti, Sr and P in the Zarrin Dasht samples. Samples position on the various tectonic setting discrimination diagrams demonstrate that these rocks were formed in environment related to subduction in active continental margins. Chlorites, are present in the rock context and also relatively filled cavities as amygdaloidal, while analcime was mainly distributed in the rock context. It seems these minerals are the result of recrystallization of volcanic glasses such as shard in the rock. Secondary minerals can be considered as a burial diagenesis and low-grade metamorphism in the studied tuffs that occurred under the upper floor pressure. https://ijp.ui.ac.ir/article_22241_1e315dccf7302a152b05b9a0ff61a7c8.pdf