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- W2947878628 abstract "Guqiong is an Ag–Au polymetallic deposit located in the eastern part of the Au–Sb ore belt along the Indus-Yarlung Zangbo suture in the North Himalaya. In this study, we have identified three major alteration/mineralization stages for Guqiong based on the mineral assemblages and their paragenetic relationships, namely the (I) pre-ore alteration, forming mainly ore-barren thick quartz veins and vuggy quartz; (II) main ore stage that comprises quartz veins with sulfide mineralization including Ag (-Au)-bearing minerals. In this stage, sericite occurs closely associated with sulfides; (III) the post-ore stage characterized by the formation of calcite and quartz with trace sulfides. Fluid inclusion assemblage (FIA) microthermometry was conducted on barren and mineralized quartz, and sphalerite. Three types of inclusions are identified based on their petrographic features and laser Raman spectra, i.e., the pure carbonic (PC), aqueous-carbonic (three-phase C1 and two-phase C2) and aqueous (W) types. The FIAs in stage I ore-barren quartz are mainly PC-type and C1-type, which are characterized by being high temperatures (260 to 300 °C), low salinities (0.8 to 3.5 wt% NaCl eqv.) and with abundant CO2. Sphalerite of main ore stage contains mainly W-type (with limited C2-type) of low temperatures (158 to 180 °C) and medium salinities (5.6 to 6.7 wt% NaCl eqv.). Meanwhile, the FIA in mineralized quartz is featured by the general coexistence of C2-type and W-type (with local PC-type and C1-type) inclusions. The fluid system may have been a mixture of the two aforementioned fluids in barren quartz and sphalerite, as indicated by two significantly different FIAs (C-type and W-type) with contrasting homogenization temperatures (260 to 290 °C and 180 to 220 °C, respectively) but comparable salinities (0.2 to 8.2 and 0.2 to 8.1 wt% NaCl eqv., respectively). The fluid δD, δ18O and δ13C values of the main ore stage quartz are −172 to −114%, 8.8 to 13.1% and −13.4 to −7.7%, respectively. The negative δ13C values are interpreted as devolatilization products of biogenic carbon with a metamorphic origin, while the δD and δ18O values likely reflect meteoric water involvement into metamorphic fluids. We propose that fluid mixing had occurred and caused sulfide precipitation at the main ore stage. Additionally, the estimated fluid trapping depth of 5 to 6 km (obtained using 3-D phase diagram) is consistent with the formation depth of many orogenic-type deposits worldwide. 40Ar/39Ar dating on sericite yielded a well-defined plateau age of 42.03 ± 0.42 Ma, with normal and inverse isochron ages of 42.8 ± 1.6 Ma and 42.9 ± 1.9 Ma, respectively. These ages bracket the Ag–Au mineralization at Guqiong, place it in the main-stage India-Asia collision and further support its orogenic-type origin." @default.
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- W2947878628 date "2019-08-01" @default.
- W2947878628 modified "2023-10-13" @default.
- W2947878628 title "The identification of the Guqiong orogenic Ag–Au polymetallic deposit in southern Tibet: Evidences from mineralogy, geochronology and fluid evolution" @default.
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- W2947878628 doi "https://doi.org/10.1016/j.oregeorev.2019.102950" @default.
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