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- W2904654791 abstract "The Baiyun gold deposit is located in the Liaodong peninsula in NE China. The gold orebodies are hosted in the Paleoproterozoic Liaohe Group metamorphic rocks. The alteration/mineralization can be divided into three stages: (I) quartz ± pyrite ± K-feldspar veins, (II) quartz-polymetallic sulfide veins, (III) quartz-carbonate veins. New LA–ICP–MS zircon U–Pb dating suggests all the ore-related porphyries, including monzonite porphyry (224.2 ± 1.3 Ma), quartz porphyry (221.4 ± 1.2 Ma) and diorite porphyry (221.8 ± 1.2 Ma), were emplaced in the Late Triassic. Four types of fluid inclusions (FIs) are identified in the ore-related quartz, i.e., liquid-rich two-phase, vapor-rich two-phase, CO2-bearing and pure CO2 FIs. The ore-forming fluids were likely characterized by medium temperature, low salinity, low density, CO2-rich, and belong to the H2O–NaCl–CO2 ± N2 ± C4H6 system. We propose that fluid phase separation likely caused rapid precipitation of the ore minerals. The C–H–O–Pb isotope data indicate that the ore-forming fluids may have had multiple sources, including magmatic, metamorphic and meteoric fluids. The ore-forming materials may have mainly derived from metamorphic rocks of the Proterozoic Gaixian Formation, and minor from the Triassic intermediate-felsic rocks. The He–Ar isotope data indicate that the ore-forming fluids were mainly crust-derived. We conclude that the Baiyun gold deposit is an orogenic-type system formed during the Late Triassic North China-Yangtze continent-continent collision." @default.
- W2904654791 created "2018-12-22" @default.
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- W2904654791 date "2019-01-01" @default.
- W2904654791 modified "2023-10-17" @default.
- W2904654791 title "Formation of the Baiyun gold deposit, Liaodong gold province, NE China: Constraints from zircon U–Pb age, fluid inclusion, and C–H–O–Pb–He isotopes" @default.
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- W2904654791 doi "https://doi.org/10.1016/j.oregeorev.2018.12.006" @default.
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