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- W3147704393 abstract "The Xiaoxi'nancha Au-Cu porphyry deposit, located in the eastern Jilin Province of Northeast China, is characterized by widespread biotite alteration, however, the age of Au-Cu mineralization is not well established. Hydrothermal biotite Ar/Ar dating and chemical composition are widely used to constrain the age and physico-chemical characteristics of hydrothermal fluids. In this paper, microscopy observation, electron microprobe analysis, and 40Ar/39Ar dating of hydrothermal biotite from the Xiaoxi'nancha porphyry Au-Cu deposit and zircon U-Pb dating on the ore-bearing granitoids have been carried out to constrain fluid characteristics and the age of mineralization. The zircon crystals from the ore-bearing granitoids display obvious inherited cores and oscillatory rims. A range of 206Pb/238U age populations were obtained on the cores (e.g., ~967 Ma, ~782 Ma, ~495 Ma, ~430 Ma, ~385 Ma, ~354 Ma, ~311 Ma) but a young population with a uniform concordia age of 254.4 Ma was determined on the rims. These features indicate the occurrence of xenocrystic zircon in the ore-bearing granitoids, and imply that these rocks were probably derived from partial melting of continental crust with significant crustal contamination. Au-Cu and Mo mineralization are found together and associated with potassic and chlorite alteration. The 40Ar/39Ar age of hydrothermal biotite (~110 Ma) is younger than the zircon U-Pb age (~255 Ma), but similar to the previously published molybdenite Re-Os age (~110 Ma). Thus, Au-Cu mineralization is coeval with Mo mineralization and formed at ~110 Ma, and has no genetic relationship with ore-bearing granitoids. The calculated log(fH2O/fHF) and log(fH2O/fHCl) ratios of hydrothermal fluids are similar to those determined at other major porphyry deposits. However, the log(fHF/fHCl) ratio is lower than that of other porphyry deposits, indicating a relatively Cl-rich hydrothermal system at Xiaoxi'nancha. The Xiaoxi'nancha porphyry Au-Cu deposit is associated with early Cretaceous granitoids, generated during subduction of the Paleo-Pacific Ocean." @default.
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- W3147704393 date "2021-07-01" @default.
- W3147704393 modified "2023-09-26" @default.
- W3147704393 title "Biotite 40Ar/39Ar dating and chemical composition inform metallogenesis of Xiaoxi'nancha porphyry Au-Cu deposit, NE China" @default.
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- W3147704393 doi "https://doi.org/10.1016/j.oregeorev.2021.104140" @default.
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