DOAJ (DOAJ: Directory of Open Access Journals), 2021
The Ebrahim-Abad iron deposit occurred on the northwestern margin of the Sanandaj-Srjan structura... more The Ebrahim-Abad iron deposit occurred on the northwestern margin of the Sanandaj-Srjan structural an assemblage is of Paleozoic metamorphic rocks and Mesozoic plutonic bodies and metasomatic rocks. The metamorphic rocks are Micaschist, Dolomite, and marble that they cut with plutonic intrusive rocks (granodiorite to milonite and cataclastic granite). Mica schist and associated detrital sediments have been changed in the low-grade greenschist facies. Marbles and plutonic intrusive rocks have also undergone cataclastic metamorphism along shear zones. Metasomatic rocks have composition garnet-amphibolite to garnitite skarn and they are cut by magnetic veins. Iron mineralization occurred chiefly as magnetite in the form of lenses, veins, veinlets, and grains. This deposit has mass, scattered, substitution, and network texture. Magnetite is generated amorphous, fine (less than 1 mm), or scattered. Cholrote, termolite-actinolite, epidote, garnet, and quartz with minor clay minerals and calcite are the gange minerals of the ore deposit. Iron oxide grade varies from 14 to 47 percent. Fe shows a negative correlation with S, and major oxides but positive Cr and Co. Ti to Ni/Cr diagram reject the hydrothermal origin for the Ebrahim-Abad iron ore deposit. Geochemical data from magnetite ore and changes in cobalt, nickel, vanadium, and titanium in it, indicate the skarn-hydrothermal origin of the Ebrahim-Abad iron deposit. It means that primarily the high iron oxide remobilized by hot hydrothermal fluids originated from intrusive bodies and redeposited in marble, mica schist, greenschist, and skarn.
The Ebrahim-Abad iron deposit occurred on the northwestern margin of the Sanandaj-Srjan structura... more The Ebrahim-Abad iron deposit occurred on the northwestern margin of the Sanandaj-Srjan structural an assemblage is of Paleozoic metamorphic rocks and Mesozoic plutonic bodies and metasomatic rocks. The metamorphic rocks are Micaschist, Dolomite, and marble that they cut with plutonic intrusive rocks (granodiorite to milonite and cataclastic granite). Mica schist and associated detrital sediments have been changed in the low-grade greenschist facies. Marbles and plutonic intrusive rocks have also undergone cataclastic metamorphism along shear zones. Metasomatic rocks have composition garnet-amphibolite to garnitite skarn and they are cut by magnetic veins. Iron mineralization occurred chiefly as magnetite in the form of lenses, veins, veinlets, and grains. This deposit has mass, scattered, substitution, and network texture. Magnetite is generated amorphous, fine (less than 1 mm), or scattered. Cholrote, termolite-actinolite, epidote, garnet, and quartz with minor clay minerals and c...
Introduction The Qahr-abad fluorite deposit is located in the area of 36°10′ 3′′ N and 46°34′ 21′... more Introduction The Qahr-abad fluorite deposit is located in the area of 36°10′ 3′′ N and 46°34′ 21′′E within the Sanandaj-Sirjan district east of the Kurdistan province , Iran and it is located ~57 km southeast of the city of Saqqez (Kholghi Khasraghi, 1999). This deposit is developed as scatter lenses, veins, and veinlets (stockwork structure) within carbonate rocks of Elika formation and controlled by the regional NW–SE trending Zagross thrust nappe system. Fault trends in this area are perpendicular to fault trends in the Zagros zone. The fault dips are nearly vertical and mineralization has occurred in the brecciation fault zone (Talaii, 2010). The rough geological instruction of the deposit has indicated that it is similar to worldwide Epithermal deposits. The mineralization occurs as replacement (type I)/ open-space (type II) vein fillings and bodies within Mesozoic lime stones (mostly Upper Triassic and Lower Jurassic members of the Elika Formation), where they crop out to form...
The Gheshlaghe mil deposit is located in the Urumieh-Dokhtar magmatic belt. Vein- type mineraliza... more The Gheshlaghe mil deposit is located in the Urumieh-Dokhtar magmatic belt. Vein- type mineralization is concordance within the rhyodacitic and rhyolite meta-tuff with Eocene age. Alteration zones of sericite, silica, argillic and iron oxides are observed in the investigated area. Primary sulfide minerals of pyrite, fine-grained chalcopyrite and Oxidized specularite and Secondary minerals goethite, limonite, malachite and quartz in Microscopic and field studies have been identified. Based on X-ray diffraction analysis studies minerals such as chlorite, illite, kaolinite, hematite, quartz, mica group and calcite have been observed in the bearing gold veins. According litho-geochemical studies, the gold element has a positive correlation with iron, molybdenum, nickel and lead. A number of 157 fluid inclusion studies in the Gheshlaghe Mil ore mineralizaion area has been showed mineralization temperature of 99 to 299 ° C, rate of salinity ore deposit 1.81 and 12.30 equivalent to the Nac...
ABSTRACT The study area is northwest part of Sanandaj–Sirjan or Esfandegha–Marivan zone in the no... more ABSTRACT The study area is northwest part of Sanandaj–Sirjan or Esfandegha–Marivan zone in the northwest of Iran. The oldest rocks which are limestone, sandstone, tuff, and lava belong to the Jurassic which have deformed during the Late Cimmerian orogeny. This complex is unconformably overlain by Cretaceous volcano sedimentary. The dominantly Cretaceous outcrops are limestone, shale, tuff, and basic to intermediate volcanic rocks. The Jurassic complex was locally metamorphosed by granitoid intrusions during the Cretaceous. Geochemical interpretations show some differ- ences in magmatic activity in the Jurassic and Cretaceous periods. Furthermore, the chemical composition confirms the alkaline to calc alkaline trend for these two major groups. In petro-tectonic diagrams, they plot in the extensional and active margin tectonic regime. The existence of a few hundred meters of Jurassic lava with interbeded sediments, which have deformed in the Late Cimmerian orogeny infer the simulta- neous existence of extension and subsidence during the Jurassic and so a compression regime in the late Jurassic (Late Cimmerian). Based on our findings, this area shows sporadically occurring extension and compression tectonic regimes over the subduction zone in the Jurassic and Cretaceous such as Cordilleran belt.
ABSTRACT Magnetite–apatite deposits in the Alborz volcano–plutonic belt, southeast Zanjan, in Ira... more ABSTRACT Magnetite–apatite deposits in the Alborz volcano–plutonic belt, southeast Zanjan, in Iran, have blade, lenzoid, and vein forms, which extend in an E-W direction. There are many magnetite–apatite veins and veinlets in this region, and some of them are economically important, such as Zaker, Morvarid, Sorkheh–Dizaj, and Aliabad. The sizes of the vein orebodies vary between 2 and 16 m in width, 10–100 m in length, and 5–40 m in depth. Microscopic examination of thin sections and polishes indicate that they are composed of magnetite and apatite, with minor amounts of goethite, hematite, actinolite, quartz, muscovite–illite, talc, dolomite, and calcite. The geochemistry and mineralogy of the granitic host rock reveals that it is calc-alkaline and I-type. Field observations, mineral paragenesis, the composition of the orebodies, and the composition of the fluid inclusions in the apatite minerals with low salinity (less than 20 wt.% NaCl equivalent) indicate that these magnetite veins were hydrothermally generated at about 200–430°C and are not related to silica–iron oxide immiscibility, as are the major Precambrian magnetite deposits in central Iran.
Magnetiteapatite deposits in the Alborz volcanoplutonic belt, southeast Zanjan, in Iran, have b... more Magnetiteapatite deposits in the Alborz volcanoplutonic belt, southeast Zanjan, in Iran, have blade, lenzoid, and vein forms, which extend in an EW direction. There are many magnetiteapatite veins and veinlets in this region, and some of them are economically ...
DOAJ (DOAJ: Directory of Open Access Journals), 2021
The Ebrahim-Abad iron deposit occurred on the northwestern margin of the Sanandaj-Srjan structura... more The Ebrahim-Abad iron deposit occurred on the northwestern margin of the Sanandaj-Srjan structural an assemblage is of Paleozoic metamorphic rocks and Mesozoic plutonic bodies and metasomatic rocks. The metamorphic rocks are Micaschist, Dolomite, and marble that they cut with plutonic intrusive rocks (granodiorite to milonite and cataclastic granite). Mica schist and associated detrital sediments have been changed in the low-grade greenschist facies. Marbles and plutonic intrusive rocks have also undergone cataclastic metamorphism along shear zones. Metasomatic rocks have composition garnet-amphibolite to garnitite skarn and they are cut by magnetic veins. Iron mineralization occurred chiefly as magnetite in the form of lenses, veins, veinlets, and grains. This deposit has mass, scattered, substitution, and network texture. Magnetite is generated amorphous, fine (less than 1 mm), or scattered. Cholrote, termolite-actinolite, epidote, garnet, and quartz with minor clay minerals and calcite are the gange minerals of the ore deposit. Iron oxide grade varies from 14 to 47 percent. Fe shows a negative correlation with S, and major oxides but positive Cr and Co. Ti to Ni/Cr diagram reject the hydrothermal origin for the Ebrahim-Abad iron ore deposit. Geochemical data from magnetite ore and changes in cobalt, nickel, vanadium, and titanium in it, indicate the skarn-hydrothermal origin of the Ebrahim-Abad iron deposit. It means that primarily the high iron oxide remobilized by hot hydrothermal fluids originated from intrusive bodies and redeposited in marble, mica schist, greenschist, and skarn.
The Ebrahim-Abad iron deposit occurred on the northwestern margin of the Sanandaj-Srjan structura... more The Ebrahim-Abad iron deposit occurred on the northwestern margin of the Sanandaj-Srjan structural an assemblage is of Paleozoic metamorphic rocks and Mesozoic plutonic bodies and metasomatic rocks. The metamorphic rocks are Micaschist, Dolomite, and marble that they cut with plutonic intrusive rocks (granodiorite to milonite and cataclastic granite). Mica schist and associated detrital sediments have been changed in the low-grade greenschist facies. Marbles and plutonic intrusive rocks have also undergone cataclastic metamorphism along shear zones. Metasomatic rocks have composition garnet-amphibolite to garnitite skarn and they are cut by magnetic veins. Iron mineralization occurred chiefly as magnetite in the form of lenses, veins, veinlets, and grains. This deposit has mass, scattered, substitution, and network texture. Magnetite is generated amorphous, fine (less than 1 mm), or scattered. Cholrote, termolite-actinolite, epidote, garnet, and quartz with minor clay minerals and c...
Introduction The Qahr-abad fluorite deposit is located in the area of 36°10′ 3′′ N and 46°34′ 21′... more Introduction The Qahr-abad fluorite deposit is located in the area of 36°10′ 3′′ N and 46°34′ 21′′E within the Sanandaj-Sirjan district east of the Kurdistan province , Iran and it is located ~57 km southeast of the city of Saqqez (Kholghi Khasraghi, 1999). This deposit is developed as scatter lenses, veins, and veinlets (stockwork structure) within carbonate rocks of Elika formation and controlled by the regional NW–SE trending Zagross thrust nappe system. Fault trends in this area are perpendicular to fault trends in the Zagros zone. The fault dips are nearly vertical and mineralization has occurred in the brecciation fault zone (Talaii, 2010). The rough geological instruction of the deposit has indicated that it is similar to worldwide Epithermal deposits. The mineralization occurs as replacement (type I)/ open-space (type II) vein fillings and bodies within Mesozoic lime stones (mostly Upper Triassic and Lower Jurassic members of the Elika Formation), where they crop out to form...
The Gheshlaghe mil deposit is located in the Urumieh-Dokhtar magmatic belt. Vein- type mineraliza... more The Gheshlaghe mil deposit is located in the Urumieh-Dokhtar magmatic belt. Vein- type mineralization is concordance within the rhyodacitic and rhyolite meta-tuff with Eocene age. Alteration zones of sericite, silica, argillic and iron oxides are observed in the investigated area. Primary sulfide minerals of pyrite, fine-grained chalcopyrite and Oxidized specularite and Secondary minerals goethite, limonite, malachite and quartz in Microscopic and field studies have been identified. Based on X-ray diffraction analysis studies minerals such as chlorite, illite, kaolinite, hematite, quartz, mica group and calcite have been observed in the bearing gold veins. According litho-geochemical studies, the gold element has a positive correlation with iron, molybdenum, nickel and lead. A number of 157 fluid inclusion studies in the Gheshlaghe Mil ore mineralizaion area has been showed mineralization temperature of 99 to 299 ° C, rate of salinity ore deposit 1.81 and 12.30 equivalent to the Nac...
ABSTRACT The study area is northwest part of Sanandaj–Sirjan or Esfandegha–Marivan zone in the no... more ABSTRACT The study area is northwest part of Sanandaj–Sirjan or Esfandegha–Marivan zone in the northwest of Iran. The oldest rocks which are limestone, sandstone, tuff, and lava belong to the Jurassic which have deformed during the Late Cimmerian orogeny. This complex is unconformably overlain by Cretaceous volcano sedimentary. The dominantly Cretaceous outcrops are limestone, shale, tuff, and basic to intermediate volcanic rocks. The Jurassic complex was locally metamorphosed by granitoid intrusions during the Cretaceous. Geochemical interpretations show some differ- ences in magmatic activity in the Jurassic and Cretaceous periods. Furthermore, the chemical composition confirms the alkaline to calc alkaline trend for these two major groups. In petro-tectonic diagrams, they plot in the extensional and active margin tectonic regime. The existence of a few hundred meters of Jurassic lava with interbeded sediments, which have deformed in the Late Cimmerian orogeny infer the simulta- neous existence of extension and subsidence during the Jurassic and so a compression regime in the late Jurassic (Late Cimmerian). Based on our findings, this area shows sporadically occurring extension and compression tectonic regimes over the subduction zone in the Jurassic and Cretaceous such as Cordilleran belt.
ABSTRACT Magnetite–apatite deposits in the Alborz volcano–plutonic belt, southeast Zanjan, in Ira... more ABSTRACT Magnetite–apatite deposits in the Alborz volcano–plutonic belt, southeast Zanjan, in Iran, have blade, lenzoid, and vein forms, which extend in an E-W direction. There are many magnetite–apatite veins and veinlets in this region, and some of them are economically important, such as Zaker, Morvarid, Sorkheh–Dizaj, and Aliabad. The sizes of the vein orebodies vary between 2 and 16 m in width, 10–100 m in length, and 5–40 m in depth. Microscopic examination of thin sections and polishes indicate that they are composed of magnetite and apatite, with minor amounts of goethite, hematite, actinolite, quartz, muscovite–illite, talc, dolomite, and calcite. The geochemistry and mineralogy of the granitic host rock reveals that it is calc-alkaline and I-type. Field observations, mineral paragenesis, the composition of the orebodies, and the composition of the fluid inclusions in the apatite minerals with low salinity (less than 20 wt.% NaCl equivalent) indicate that these magnetite veins were hydrothermally generated at about 200–430°C and are not related to silica–iron oxide immiscibility, as are the major Precambrian magnetite deposits in central Iran.
Magnetiteapatite deposits in the Alborz volcanoplutonic belt, southeast Zanjan, in Iran, have b... more Magnetiteapatite deposits in the Alborz volcanoplutonic belt, southeast Zanjan, in Iran, have blade, lenzoid, and vein forms, which extend in an EW direction. There are many magnetiteapatite veins and veinlets in this region, and some of them are economically ...
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