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- W2936699483 abstract "The Wangjiadashan Cu–Au deposit is a vein-type deposit controlled by the secondary faults of the Wushan Fault zone in the Suizao area of Hubei Province. Three hydrothermal stages are identified, namely, (I) barren quartz stage, (II) the quartz-sulphide stage, and (III) quartz-carbonate stage. Six types of fluid inclusions occur in quartz: (a) liquid-rich aqueous fluid inclusions (L + V), (b) vapour-rich aqueous-carbonic fluid inclusions (V + L), (c) water-rich aqueous-carbonic fluid inclusions (L + V + CO2), (d) CO2-rich aqueous-carbonic fluid inclusions (V + L + CO2), (e) pure carbonic fluid inclusions (pure CO2), and (f) daughter mineral-bearing multiphase inclusions (S-type) with three subclasses (S1, S2, and S3 subtype). Two types of fluid inclusions occur in calcite: (a) liquid-rich aqueous fluid inclusions (L + V) and (b) pure carbonic fluid inclusions (pure CO2). The S-type fluid inclusions include halite (NaCl), calcite (CaCO3), and chalcopyrite (CuFeS2). The fluid system is composed of CO2–NaCl–H2O. The homogenization temperatures of the three stages are 295°C to 390°C, 245°C to 280°C, and 200°C to 241°C, with salinities of 7.3–19.8 wt% NaCl equiv. (except for several high values of 33.8 to 44.3 wt% NaCl equiv.), 7.7–13.7 wt% NaCl equiv., and 5.6–10.1 wt% NaCl equiv., respectively. Fluid immiscibility occurred in stage I that accounts for the high-salinity fluids, but the dominant ore precipitation occurred afterward during temperature drop. In situ sulphur isotope analysis indicates a δ34S value around 0 (+1.1% to +2.2%) for the chalcopyrite, suggesting that the sulphur likely derived from the deep-seated magma. Pyrites show δ34S values from −0.5‰ to +6.5‰ in stage II, from +0.7‰ to +6.6‰ in country rock of marble, but significantly higher from +12.8‰ to +21.7‰ in country rock of greenschist. These results indicate the sulphur for pyrite in stage II likely derived from the mixing of deep-seated magma and country rocks. From stages I to II, a slightly increase of δD (from −86‰ and −73‰ to −59‰ and −56‰) and a decrease of δ18O (from 8.9‰ and 7.1‰ to 1.3‰ and 3.4‰) indicate that an increasing involvement of meteoric water. The carbon isotopes of fluid inclusions CO2 in quartz of stage I (−11.0‰ to −13.0‰) indicate a major magmatic or metamorphic carbon source mixed with minor sedimentary sourced carbon, but a major organic carbon source (−32.0‰ to −35.0‰) for stage II fluids. In conclusion, the Wangjiadashan Cu–Au deposit belongs to the orogenic type." @default.
- W2936699483 created "2019-04-25" @default.
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- W2936699483 date "2019-04-15" @default.
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- W2936699483 title "Fluid inclusions and <scp>H–O–C–S</scp> isotope constraints on fluid evolution and ore genesis of the <scp>Wangjiadashan Cu–Au</scp> deposit in <scp>Suizao</scp> area of the <scp>Tongbai‐Dabie</scp> orogenic belt, central <scp>China</scp>" @default.
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- W2936699483 doi "https://doi.org/10.1002/gj.3518" @default.
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