University of IsfahanPetrological Journal2228-52103920120521Petrology of the Tekyeh-Bala area granite veins (northeast of Sonqor), some evidences for A2-type granitoidsPetrology of the Tekyeh-Bala area granite veins (northeast of Sonqor), some evidences for A2-type granitoids11616091FAFarhadAlianiخیابان شهید فهمیده- دانشگاه بوعلی سیناMohammadMaanijouMirmohammadMiriJournal Article20160614Magmatic activities during Mesozoic and Cenozoic emplaced several basic, intermediate and acidic intrusive bodies in the north part of the Sanandaj-Sirjan zone. Most of these bodies have genetic relationship with each other, but some of them formed by special magmatic processes and show different geochemical features. In the Tekyeh-Bala area (northeast of Sonqor) there are several granite veins which penetrated into the diorite rocks and have different geochemical characteristics from the host diorite. These granitic veins are alkalic belonging to the shoshonitic magma series. Also, they possess the geochemical properties of A-type granitiods, i.e., metaluminous nature (A/CNK=0.96-0.99), high HFSE (HFSE=192-412 ppm), Zr (230-420 ppm), FeOt/(FeOt+MgO) (0.89 in average) and K2O (4.2-6.2 wt%) contents. Regarding to the relatively enrichment of Rb, K, Cs and Th with respect to Nb and Ti in these samples which is a indicator property of active continental margins and also their post-orogenic tectonic regime, the studied granite can be classified as A2-type granitiods.Magmatic activities during Mesozoic and Cenozoic emplaced several basic, intermediate and acidic intrusive bodies in the north part of the Sanandaj-Sirjan zone. Most of these bodies have genetic relationship with each other, but some of them formed by special magmatic processes and show different geochemical features. In the Tekyeh-Bala area (northeast of Sonqor) there are several granite veins which penetrated into the diorite rocks and have different geochemical characteristics from the host diorite. These granitic veins are alkalic belonging to the shoshonitic magma series. Also, they possess the geochemical properties of A-type granitiods, i.e., metaluminous nature (A/CNK=0.96-0.99), high HFSE (HFSE=192-412 ppm), Zr (230-420 ppm), FeOt/(FeOt+MgO) (0.89 in average) and K2O (4.2-6.2 wt%) contents. Regarding to the relatively enrichment of Rb, K, Cs and Th with respect to Nb and Ti in these samples which is a indicator property of active continental margins and also their post-orogenic tectonic regime, the studied granite can be classified as A2-type granitiods.https://ijp.ui.ac.ir/article_16091_0d19a4a1cf0182276e7a8485d42df1e3.pdfUniversity of IsfahanPetrological Journal2228-52103920120521Determination of approximate center of mineralization and precipitation conditions of copper-gold using minerallography and fluids inclusions in the Kalchouyeh occurrence (Southwest Naein)Determination of approximate center of mineralization and precipitation conditions of copper-gold using minerallography and fluids inclusions in the Kalchouyeh occurrence (Southwest Naein)173616093FAHengamehHosseini DinaniHashemBagheriدانشگاه اصفهانJournal Article20160614The Kalchouyeh area, southwest of Nain is located in the Uromieh-Dokhtar volcano-plutonic belt. From the lithologic point of view, this area is mainly comprised of pyroxene andesite lavas, trachy- andesites, tuffic sand stones and lithic tuffs. Mineralization (Cu=Ave. 7637.755, Au=Ave. 0.55 ppm)occurred mainly as disseminations and veinlets hosted by trachy andesite and pyroxene andesites. Fluid inclusion and minerallographic studies were carried out to determine the direction and the source of the ore - bearing fluids. The two major mineralized zones: A (larger vein) from the North-Northwest and B (smaller vein) from the East-Southeast of the area were sampled. The alteration studies have revealed that the main alteration assemblages are comprised of silicification and propylitic. The ore minerals are chalcopyrite, galena, pyrite, bornite, chalcocite, covellite, goethite, malachite, azurite and cuprite with quartz, calcite and barite as the main gangues. By means of these evidences, it seems that two major processes that carry ore elements are diffusion adjacent to fractures and mainly infiltration into fractures. Petrographic studies on fluid inclusions indicate that most of them are circular to subhedral and in some cases elongated in shape. The most studied inclusions are two phases (L+V) type having a relatively big vapor bubble. The direction of ore bearing fluids movement is determined according to homogenization temperature, salinity of fluid inclusions and types of mineralization, from east-southeast to north-northwest. It seems that approximate site of mineralization center is located adjacent to small vein B. On the base of aforementioned evidences, the principle deposition mechanism of ore minerals was mixing of two meteoric and magmatic fluids and the mineralization is Low-sulphide epithermal in type.The Kalchouyeh area, southwest of Nain is located in the Uromieh-Dokhtar volcano-plutonic belt. From the lithologic point of view, this area is mainly comprised of pyroxene andesite lavas, trachy- andesites, tuffic sand stones and lithic tuffs. Mineralization (Cu=Ave. 7637.755, Au=Ave. 0.55 ppm)occurred mainly as disseminations and veinlets hosted by trachy andesite and pyroxene andesites. Fluid inclusion and minerallographic studies were carried out to determine the direction and the source of the ore - bearing fluids. The two major mineralized zones: A (larger vein) from the North-Northwest and B (smaller vein) from the East-Southeast of the area were sampled. The alteration studies have revealed that the main alteration assemblages are comprised of silicification and propylitic. The ore minerals are chalcopyrite, galena, pyrite, bornite, chalcocite, covellite, goethite, malachite, azurite and cuprite with quartz, calcite and barite as the main gangues. By means of these evidences, it seems that two major processes that carry ore elements are diffusion adjacent to fractures and mainly infiltration into fractures. Petrographic studies on fluid inclusions indicate that most of them are circular to subhedral and in some cases elongated in shape. The most studied inclusions are two phases (L+V) type having a relatively big vapor bubble. The direction of ore bearing fluids movement is determined according to homogenization temperature, salinity of fluid inclusions and types of mineralization, from east-southeast to north-northwest. It seems that approximate site of mineralization center is located adjacent to small vein B. On the base of aforementioned evidences, the principle deposition mechanism of ore minerals was mixing of two meteoric and magmatic fluids and the mineralization is Low-sulphide epithermal in type.https://ijp.ui.ac.ir/article_16093_8d16748aec572297642c7f0c88c9b9fc.pdfUniversity of IsfahanPetrological Journal2228-52103920120521Petrology and geochemistry of volcanic rocks from the South of Tabriz (Sahand Volcano)Petrology and geochemistry of volcanic rocks from the South of Tabriz (Sahand Volcano)375616090FAFarhadPirmohammadi AlishahAliAmeriAhmadJahangiriMansourMojtahediMehmetKeskinJournal Article20160614The area under study is situated in the south of Tabriz and east of Urmia Lake. The area is dominated by a sequence of volcanic rock ranging from rhyolitic to dacitic composition related to volcanic processes in the Oligo-Miocene, middle and upper Miocene, Pliocene clastic sedimentary rocks and lower Pliocene epiclastic sediments. The volcanic rocks as Dome-Ring shape,emplaced in a good order as the middle domes have rhyolitic and rhyodacitic whereas the marginal ones have dacitic and trachytic composition. The major minerals including plagioclase, hornblende and quartz, set in a fine grained and glassy matrix. Porphyritic is the dominate texture. Sieve texture and selective alteration in some plagioclases, the presence of biotite and hornblende with opacitic rims, associated with some other disequilibrium textures are characteristic features of the rocks studied. Based on the high LILE/HFSE and LREE/HREE ratios and their similar composition to that of the subduction volcanic rock suites, the rocks of the area seem to have formed in a subduction zone. Compared to rhyolitic and dacitic rocks from typical tectonic environments, the compatible and incompatible elements patterns for the rhyolitic and dacitic rocks from the study area are more consistent with a post-collision volcanic arc setting.The area under study is situated in the south of Tabriz and east of Urmia Lake. The area is dominated by a sequence of volcanic rock ranging from rhyolitic to dacitic composition related to volcanic processes in the Oligo-Miocene, middle and upper Miocene, Pliocene clastic sedimentary rocks and lower Pliocene epiclastic sediments. The volcanic rocks as Dome-Ring shape,emplaced in a good order as the middle domes have rhyolitic and rhyodacitic whereas the marginal ones have dacitic and trachytic composition. The major minerals including plagioclase, hornblende and quartz, set in a fine grained and glassy matrix. Porphyritic is the dominate texture. Sieve texture and selective alteration in some plagioclases, the presence of biotite and hornblende with opacitic rims, associated with some other disequilibrium textures are characteristic features of the rocks studied. Based on the high LILE/HFSE and LREE/HREE ratios and their similar composition to that of the subduction volcanic rock suites, the rocks of the area seem to have formed in a subduction zone. Compared to rhyolitic and dacitic rocks from typical tectonic environments, the compatible and incompatible elements patterns for the rhyolitic and dacitic rocks from the study area are more consistent with a post-collision volcanic arc setting.https://ijp.ui.ac.ir/article_16090_7b2bcff5cb264fc85745a391c275ed43.pdfUniversity of IsfahanPetrological Journal2228-52103920120521The occurrence of tourmaline in Kuh Zar (Baghoo) Au-Cu mine, south of Semnan provinceThe occurrence of tourmaline in Kuh Zar (Baghoo) Au-Cu mine, south of Semnan province577016094FAKhadijehKhaliliMohammad AliMackizadehJournal Article20160614The Kuh Zar Au- Cu mine is located south of Semnan province within volcano-plutonic belt of Troud-Chah-Shirin with upper Eocene to Mio-Pliocene age. The tourmaline of the study area occurred as concentration or massive forms within altered zone in contact with the granodioritic intrusion and related to the hydrothermal system. In the area, the tourmalinization process is pervasive and in association with mineral assemblage sericite+quartz+tourmaline+pyrite+feldspars as well as Cu ore deposit. The composition of tourmalines is Shorleâdravite series with more tendency towards dravite component. These phases belong to alkaline tourmaline and are associated with quartz- tourmaline, meta-pelites, Ca-depleted meta-psamiteand and meta-pelites associated with Al-phase. The studied tourmalines contain X-Ca=61.07-1.77, X-Mg=0.01-0.1 and Al>6a.p.f.u. Therefore, the replacements of AlO(Mg)(OH), CaMgNa-1Al-1 and ïAl(Na-Mg) is possible in their structure. High Mg content and chemical zoning of these minerals point to their hydrothermal origin. The FeO/MgO+FeO ratioThe Kuh Zar Au- Cu mine is located south of Semnan province within volcano-plutonic belt of Troud-Chah-Shirin with upper Eocene to Mio-Pliocene age. The tourmaline of the study area occurred as concentration or massive forms within altered zone in contact with the granodioritic intrusion and related to the hydrothermal system. In the area, the tourmalinization process is pervasive and in association with mineral assemblage sericite+quartz+tourmaline+pyrite+feldspars as well as Cu ore deposit. The composition of tourmalines is Shorleâdravite series with more tendency towards dravite component. These phases belong to alkaline tourmaline and are associated with quartz- tourmaline, meta-pelites, Ca-depleted meta-psamiteand and meta-pelites associated with Al-phase. The studied tourmalines contain X-Ca=61.07-1.77, X-Mg=0.01-0.1 and Al>6a.p.f.u. Therefore, the replacements of AlO(Mg)(OH), CaMgNa-1Al-1 and ïAl(Na-Mg) is possible in their structure. High Mg content and chemical zoning of these minerals point to their hydrothermal origin. The FeO/MgO+FeO ratiohttps://ijp.ui.ac.ir/article_16094_30fcd2f54b07b134b1288f0463543558.pdfUniversity of IsfahanPetrological Journal2228-52103920120521Geochemical modelling of controlling phases on abundances of major and trace elements in the migmatitic amphibolites, Seghalaton, Neyriz, IranGeochemical modelling of controlling phases on abundances of major and trace elements in the migmatitic amphibolites, Seghalaton, Neyriz, Iran718616092FAAbdolnaserFazlniaارومیه، دانشگاه ارومیه، دانشکده علوم، گروه زمین شناسیJournal Article20160614Arc-related regional metamorphic process at c. 147 Ma caused a Barrovian-type metamorphism on the Qori old amphibolites crop outed in the southeast of the Sanandaj-Sirjan zone. As a consequence, the amphibolites from the southern Seghalaton subjected to partial melting under the metamorphic peak 700 to 750 °C and 7 to 9 Kbar. As a result of the process: 1) mafic migmatite, formed by different degrees of partial melting, were expanded in these amphibolites 2) extracting of small outcrops of trondhjemites were produced by the less than 10 percent of the melt and 3) balanced in situ crystallization and the adhesion force of melt-crystal lead to remain a large part of the partial melt in the mafic migmatites. Additionally, high viscosity of the magma and low temperature of the partial melting in the source were other important factors to be extracting the melt. In situ crystallization of many mafic migmatite from the Seghalaton area caused poikiloblastic texture to be developed. Field and petrographic evidences as well as geochemical modelling using REE, Sr, Ba, Cr, Nb, Y and Ti, show that the protolith (amphibolite) has undergone a partial melting event between 20 to 50 percent, but in situ crystallization and adhesion force of melt-melanosome caused up to 10 percent of the melt (leucosome) to leave these rocks and to produce the trondhjemites.Arc-related regional metamorphic process at c. 147 Ma caused a Barrovian-type metamorphism on the Qori old amphibolites crop outed in the southeast of the Sanandaj-Sirjan zone. As a consequence, the amphibolites from the southern Seghalaton subjected to partial melting under the metamorphic peak 700 to 750 °C and 7 to 9 Kbar. As a result of the process: 1) mafic migmatite, formed by different degrees of partial melting, were expanded in these amphibolites 2) extracting of small outcrops of trondhjemites were produced by the less than 10 percent of the melt and 3) balanced in situ crystallization and the adhesion force of melt-crystal lead to remain a large part of the partial melt in the mafic migmatites. Additionally, high viscosity of the magma and low temperature of the partial melting in the source were other important factors to be extracting the melt. In situ crystallization of many mafic migmatite from the Seghalaton area caused poikiloblastic texture to be developed. Field and petrographic evidences as well as geochemical modelling using REE, Sr, Ba, Cr, Nb, Y and Ti, show that the protolith (amphibolite) has undergone a partial melting event between 20 to 50 percent, but in situ crystallization and adhesion force of melt-melanosome caused up to 10 percent of the melt (leucosome) to leave these rocks and to produce the trondhjemites.https://ijp.ui.ac.ir/article_16092_5b440363dd6652310c75a463e5e9f475.pdfUniversity of IsfahanPetrological Journal2228-52103920120521Thermobarometry of intrusion bodies from Soltanabad area (NE Sabzevar): with special reference to their adjoining metamorphic aureole and reaction rimThermobarometry of intrusion bodies from Soltanabad area (NE Sabzevar): with special reference to their adjoining metamorphic aureole and reaction rim8710616095FAMohsenNasrabadyگروه زمین شناسی دانشگده علوم پایه دانشگاه بین المللی امام خمینیJournal Article20160614Several tonalitic-trondhjemitic intrusion bodies have been injected into the metamorphic complex consisting of greenschist, blueschist and Grt-amphibolites in the Soltanabad area (NE Sabzevar). Thermobarometry of these bodies that carried out by whole rock chemical chemistry, the occurrence of magmatic garnet and epidote as well as geochemical characteristics of amphibole and plagioclase point to crystallization temperature of 665 to 749 °C and pressure between 8 to 11 Kbar. In order to estimate the depth of emplacement and to obtain the more precise crystallization temperature, temperature and pressure conditions of metamorphic aureole and reaction rim of the outer margins of the intrusion bodies, were calculated. On the base of obtained data, the conditions of pressure and temperature of emplacement and solidifications of intrusion bodies are compatible with the scenario of partial melting of young subducted oceanic lithosphere at depth of a hot subduction zone.Several tonalitic-trondhjemitic intrusion bodies have been injected into the metamorphic complex consisting of greenschist, blueschist and Grt-amphibolites in the Soltanabad area (NE Sabzevar). Thermobarometry of these bodies that carried out by whole rock chemical chemistry, the occurrence of magmatic garnet and epidote as well as geochemical characteristics of amphibole and plagioclase point to crystallization temperature of 665 to 749 °C and pressure between 8 to 11 Kbar. In order to estimate the depth of emplacement and to obtain the more precise crystallization temperature, temperature and pressure conditions of metamorphic aureole and reaction rim of the outer margins of the intrusion bodies, were calculated. On the base of obtained data, the conditions of pressure and temperature of emplacement and solidifications of intrusion bodies are compatible with the scenario of partial melting of young subducted oceanic lithosphere at depth of a hot subduction zone.https://ijp.ui.ac.ir/article_16095_f5d143a6fc09f0058938382b9aeaa738.pdfUniversity of IsfahanPetrological Journal2228-52103920120521Skarn mineralization in north part of Kal-e Kafi and its relation with Kal-e Kafi intrusive bodySkarn mineralization in north part of Kal-e Kafi and its relation with Kal-e Kafi intrusive body10712616096FASaeidehRanjbarMoussaKalimi NoghreyanMohammad AliMackizadehJournal Article20160614The Kal-e Kafi granitoid body and related skarn, a part of the Central Iranian zone and the Yazd block, are located 60 Km Northeast of Anarak (Northeast of Isfahan province). This Late Eocene-Oligocene granitoid body intruded into the Eocene volcanic, volcaniclastic rocks and the Anarak metamorphic units, giving rise to the formation of widespread hornfels and limited skarn deposits. Different lithological units from gabbro to microgranite are the main constituents of this large and complex intrusive body. The geochemical data as well as the petrographic studies show that monzonite to quartz monzodiorite are in close relationship to skarn mineralization. Also, these rocks, display characteristics of high potassium calc-alkaline, metaluminous and I type magma. Using geochemical discrimination diagrams, the magmatism developed in VA related late geotectonical environment. On the base of the aforementioned data and comparison with chemical composition of some world's skarns forming granitoid, it can be concluded that the Kal-e Kafi skarn is Cu-Au-Fe type. Field and petrographic studies document that there are five stages in the skarn evolution. Several samples from mineralized quartz veins were used for fluid inclusion geothermometry. Considering the homogenization temperature of quartz veins and some secondary textures in ore minerals, the ore mineralization stage and veining are simultaneous. The boiling evidences in fluid inclusions are considered the most important factor for ore deposition in the temperature range of 250-375 °C. Boiling is also caused the occurrence of two distinct fluids together high- (type V) and low-salinity (type I, IV) fluids. Metals transported as chloride complexes and precipitated as sulfide minerals while the boiling process was ended. The opaque minerals (chalcopyrite, pyrite and magnetite) formed in the final stage of skarn formation, due to decreasing temperature (150-200 °C) and increasing oxidation conditions, were altered into goethite, bornite, covellite and martite, respectively. Tectonic movement and the occurrence of many faults in the area, play an important role in the quartz veins emplacement and ore mineral alteration stage. The calc-alkaline and I type Kal-e Kafi intrusive body can be proposed as the source of Cu, Fe and Au bearing hydrothermal fluids and skarn mineralization.The Kal-e Kafi granitoid body and related skarn, a part of the Central Iranian zone and the Yazd block, are located 60 Km Northeast of Anarak (Northeast of Isfahan province). This Late Eocene-Oligocene granitoid body intruded into the Eocene volcanic, volcaniclastic rocks and the Anarak metamorphic units, giving rise to the formation of widespread hornfels and limited skarn deposits. Different lithological units from gabbro to microgranite are the main constituents of this large and complex intrusive body. The geochemical data as well as the petrographic studies show that monzonite to quartz monzodiorite are in close relationship to skarn mineralization. Also, these rocks, display characteristics of high potassium calc-alkaline, metaluminous and I type magma. Using geochemical discrimination diagrams, the magmatism developed in VA related late geotectonical environment. On the base of the aforementioned data and comparison with chemical composition of some world's skarns forming granitoid, it can be concluded that the Kal-e Kafi skarn is Cu-Au-Fe type. Field and petrographic studies document that there are five stages in the skarn evolution. Several samples from mineralized quartz veins were used for fluid inclusion geothermometry. Considering the homogenization temperature of quartz veins and some secondary textures in ore minerals, the ore mineralization stage and veining are simultaneous. The boiling evidences in fluid inclusions are considered the most important factor for ore deposition in the temperature range of 250-375 °C. Boiling is also caused the occurrence of two distinct fluids together high- (type V) and low-salinity (type I, IV) fluids. Metals transported as chloride complexes and precipitated as sulfide minerals while the boiling process was ended. The opaque minerals (chalcopyrite, pyrite and magnetite) formed in the final stage of skarn formation, due to decreasing temperature (150-200 °C) and increasing oxidation conditions, were altered into goethite, bornite, covellite and martite, respectively. Tectonic movement and the occurrence of many faults in the area, play an important role in the quartz veins emplacement and ore mineral alteration stage. The calc-alkaline and I type Kal-e Kafi intrusive body can be proposed as the source of Cu, Fe and Au bearing hydrothermal fluids and skarn mineralization.https://ijp.ui.ac.ir/article_16096_8f17c4b7e925b1ba08500017d6af9caa.pdf