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• W4313649414 abstract "In this study, petrographic, microthermometric, and synchrotron radiation X-ray fluorescence (SRXRF) analyses of fluid inclusions were conducted to shed light on the mineralization mechanism of the Dongtongyu deposit and provide some evidence of the relationship among CO 2 , Au, and other ore elements (e.g., Cu, Fe, Zn, and Pb) in ore-forming fluids. The ore-forming fluid is characterized as the H 2 O–CO 2 –NaCl system with medium–high temperatures and low salinities. Four structural mineralization stages are distinguished: Pyrite-quartz (Stage 1), gold-quartz-pyrite (Stage 2), gold-quartz-polymetallic sulfide (Stage 3), and quartz-calcite (Stage 4). Fluid inclusions in Stages 1–3 are dominated by the H 2 O–CO 2 type, and most of them contain liquid H 2 O and liquid CO 2 at room temperature. The melting temperatures (T m-CO2 = −82.1°C to −57.5°C) of solid CO 2 in Stage 1 are relatively low. The values of T m-CO2 in Stages 2–3 are quite close, with ranges of −60.5°C to −56.5°C and −59.2°C to −58.6°C, respectively. The melting temperatures of clathrate in Stages 1–3 are −2.7°C to +7.8°C, −5.5°C to +7.8°C, and +3.7°C to +7.2°C. The homogenization temperatures of the CO 2 phase in the H 2 O–CO 2 inclusions of the three stages are measured as −7.5°C to +31.7°C, −7.5°C to +29.3°C, and 7.1°C to +24.1°C. The total homogenization temperatures in Stages 1–3 are 180°C–394°C, 202°C–305°C, and 224°C–271°C, with salinities of 4.3 wt.%–18.2 wt% NaCl, 4.3 wt.%–20.0 wt% NaCl, and 5.3 wt.%–11.0 wt% NaCl, respectively. The laser Raman spectroscopy results show that the CO 2 –H 2 O inclusions in the quartz veins contain abundant CO 2 and CH 4 . The SRXFR results show that most of the elements, especially As, Te, and Cu, are more enriched in liquid CO 2 than in liquid H 2 O. The elements of Au, Fe, Ni, Cu, and Pb have higher concentrations in H 2 O–CO 2 -type fluid inclusions in Stage 2 than other fluid inclusions in Stages 1–2, suggesting that gold mineralization is closely related to CO 2 -rich fluids. During the fluid evolution process, fluid immiscibility is an important mineralization mechanism of gold. The increase in CO 2 and CH 4 and the decrease in the fluid temperature might promote fluid immiscibility." @default.
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• W4313649414 date "2023-01-06" @default.
• W4313649414 modified "2023-10-01" @default.
• W4313649414 title "Fluid mineralization of the Dongtongyu gold deposit in the southern margin of North China craton: Evidence from microthermometry and composition of fluid inclusions" @default.
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• W4313649414 doi "https://doi.org/10.3389/feart.2022.1081634" @default.
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