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• W3136157360 endingPage "104125" @default.
• W3136157360 startingPage "104125" @default.
• W3136157360 abstract "Recent mineral exploration has identified a new gold metallogenic belt which contains reserves of >120 tonnes Au along the northeastern margin of the Jiaolai Basin, Jiaodong Province. However, the origin of these deposits remains a subject of considerable debate. This paper presents a combination of fluid inclusion and systematic H–O–He–Ar–S-Pb isotopic data of the Tudui–Shawang deposit which is characterized by sulfide-rich ores. Homogenization temperatures of fluid inclusions in the three recognized stages are 245 to 426 °C, 210 to 410 °C, and 160 to 270 °C, respectively, all of which exhibit salinities lower than 15 wt% NaCl equivalent. The δ18OH2O values of quartz in ore stages 1 and 2 range from + 3.4‰ to + 6.3‰ and + 2.3‰ to + 4.5‰, whereas the δDSMOW from − 93‰ to − 86‰ and − 97‰ to − 83‰, respectively. The data suggest that ore fluids are derived from magma gradually mixing with more meteoric water late. The measured 3He/4He (40Ar/36Ar) of hydrothermal fluids in pyrites are 1.53 to 3.21 Ra (732 to 1783) for stage 1, and 0.38 to 2.58 Ra (360 to 1544) for stage 2. The linear correlation between He and Ar isotopes is the result from a mixture between mantle components and crustal fluid. The estimated 3He/heat ratios range from 0.13 to 2.55 × 10−12 cm3 STP J−1, reflecting the hydrothermal fluids are derived by convection rather than conduction. The in-situ δ34S values of three types of pyrite (Py1, Py2-1, and Py 2–2) from two stages have a narrow and similar range from + 7.1 to + 9.7‰, indicating common deep sulfur sources. Lead isotopic compositions of pyrites (206Pb/204Pb = 17.102 to 18.248; 207Pb/204Pb = 15.435 to 15.590; 208Pb/204Pb = 37.659 to 38.691) show a consistent origin as mafic dikes. Thus, we propose deep-seated, most likely mafic dike magmatic and mantle-derived sources for gold ore formation. When compared to other Jiaodong gold deposits, they exhibit similar geochemical signatures and thus consistent geodynamic setting. They are considered to associate with the subduction of the Paleo-Pacific Plate and the destruction of the North China Craton during the Early Cretaceous." @default.
• W3136157360 created "2021-03-29" @default.
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• W3136157360 date "2021-06-01" @default.
• W3136157360 modified "2023-09-29" @default.
• W3136157360 title "Origin of the Tudui–Shawang gold deposit, Jiaodong Peninsula, north China Craton: Constraints from fluid inclusion and H-O-He-Ar-S-Pb isotopic compositions" @default.
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• W3136157360 doi "https://doi.org/10.1016/j.oregeorev.2021.104125" @default.
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