hydrothermal garnet in porphyry copper related skarn deposits, ali-abad, yazd province, iran
نویسندگان
چکیده
the ali-abad porphyry copper deposit is located in the central iranian magmatic belt. as a result of subduction magmatism, oligo-miocene leucogranitoid rocks have intruded into conglomerates of lower cretaceous age. due to contact metamorphism the following mineral assemblage has occurred in the altered conglomerate: garnet (andradite-grossular) + epidote+ quartz + calcite + pyrite skarnification have only occurred in reactive carbonate clasts of the conglomerates. chemical composition of garnets and classic discrimination scheme imply the porphyry copper related skarn-type mineralization. garnets are characterized by abrupt chemical zoning area and thin bands. ree pattern of skarn garnet and host granite have similar trends, so it is concluded that garnets are hydrothermal in origin. the garnet mineralization episode occurred during skarnification, giving hydrothermal fluid temperatures of 422-472 ºc, likely this episode corresponds to the fluid boiling and high fo2 of garnet forming processes in the skarn system. probably, the temporal decrease of hydrothermal fluid pressure led to rapid growths of andradite zones i.e., extensive hydrofracturing, porosity of conglomerate could be the dominant conditions which led to boiling of hydrothermal fluids and precipitation of andradite garnet.
منابع مشابه
petrogenesis of skarn related cu-porphyry intrusion deposit, ali-abad- darreh zereshk, yazd
the study area is a part of cenozoic magmatic belt of central iran, which is located in the west of yazd porovince. contact metamorphism and skarn occurred in conglomerate part of sngestan formation. the oligocene intrusion bodies of ali-abad-darreh zereshk are leucocerate and have the chemical composition of granite to granodiorite with calc-alkaline affinity from volcanic arc geological setti...
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.................................................................................................................................. iii LIST OF TABLES ........................................................................................................................ vii LIST OF FIGURES .............................................................................................................
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عنوان ژورنال:
iranian journal of science and technology (sciences)ISSN 1028-6276
دوره 37
شماره 1 2013
کلمات کلیدی
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