Fluid Inclusion and Stable Isotope Geochemistry of the Orogenic–Type MARK Zinvinjian Cu–Pb–Zn–Au Deposit in the Sanandaj–Sirjan Metamorphic Belt, Northwest Iran
Journal of Geochemical Exploration 184 (2018) 82–96 Contents lists available at ScienceDirect Journal of Geochemical Exploration journal homepage: www.elsevier.com/locate/gexplo Fluid inclusion and stable isotope geochemistry of the orogenic–type MARK Zinvinjian Cu–Pb–Zn–Au deposit in the Sanandaj–Sirjan metamorphic belt, Northwest Iran ⁎ Sina Asadia, Shojaeddin Niroomandb, , Farid Moorea a Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran b Department of Geology, Faculty of Science, University of Tehran, Tehran 14155–64155, Iran ARTICLE INFO ABSTRACT Keywords: The Zinvinjian polymetallic deposit occurs as veins controlled by a NW–SE trending–structure within the Quartz veins Cretaceous metamorphosed limestone and dolomite, schist, and metavolcanic rocks, northwest of Iran. The Metamorphic fluid retrograde greenschist facies metamorphism was accompanied by large–scale transpressional faulting, crack–- Fluid unmixing seal veins, infiltration of large volumes of hydrous fluid with high XCO2, and is largely overlapped by the main Stable isotopes hydrothermal events. The metamorphism has resulted in two stages of mineralization in the Zinvinjian deposit. Zinvinjian These are early–stage polymetallic sulfides–quartz and late–stage pyrite–quartz veins. The early–stage veins Iran filled fractures and are undeformed, suggesting a tensional shear setting. The late–stage veins are also mainly open–space fissure–fillings that cut or replace earlier veins. Three types of fluid inclusions (FIs), including aqueous (type–I), mixed carbonic–aqueous (type–II), and carbonic (type–III), were identified in ore–related quartz veins. The early–stage quartz contained all three types of primary FIs homogenized at temperatures of range 197–300 °C and salinities of 2.5–15.2 wt% NaCl equivalent.
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