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• W4283204967 endingPage "107042" @default.
• W4283204967 startingPage "107042" @default.
• W4283204967 abstract "The Tongchang granodiorite porphyry intrusion is located at the giant Dexing porphyry Cu-Mo-Au deposit in South China, and both mechanism of petrogenesis and mineralization remain controversial. In this study, results of zircon U–Pb dating of three granodiorite porphyries yield ages of 169.8 ± 1.3 Ma, 167.1 ± 1.1 Ma, and 166.2 ± 1.3 Ma, respectively, indicating that their formation ages are contemporaneous. The zircon Hf isotopes of the three samples are consistent within the range of error (εHf(t) = 2.5–4.8), indicating that they share the same magma source. Values of Sr isotopes range from 0.70414 to 0.70759 (av. 0.70520) and 0.70530 to 0.70745 (av. 0.70624) for altered apatite and 0.70368 to 0.70493 (av. 0.70443) for fresh apatite. Major elements (F and Cl) of altered apatite (F = 1.51–2.44 wt%, Cl = 1.33–2.32 wt%) are significantly different from unaltered apatite (F = 2.54–4.62 wt%, Cl = 0.004–1.20 wt%). Trace element compositions, such as δEu, δCe, REE distribution patterns, and etc., between different apatites are also diverse. All these apatite geochemical data indicate that some apatite grains were modified by hydrothermal fluids, which were derived from the crust characterized by higher oxygen fugacity than the initial magma, indicating that they have undergone the decomposition of plagioclase. Chlorite geothermometers show that the formation temperature of chlorite from three granodiorite porphyry samples ranges from 221 to 269 °C (av. 240 °C), 236 to 254 °C (av. 246 °C), and 196 to 232 °C (av. 215 °C), respectively, indicating the temperature of hydrothermal alteration. The apatite and zircon data suggest that the Dexing porphyries were derived from partial melting of the subducted paleo-Pacific plate during the Jurassic rather than from the lower crust. Subducted oceanic crust with high oxygen fugacity and initial Cu content and Cl content are the key factors in forming the giant Dexing porphyry Cu-Mo-Au deposit." @default.
• W4283204967 created "2022-06-22" @default.
• W4283204967 creator A5005013690 @default.
• W4283204967 creator A5032365953 @default.
• W4283204967 creator A5042943723 @default.
• W4283204967 creator A5058226989 @default.
• W4283204967 creator A5079594267 @default.
• W4283204967 creator A5082937922 @default.
• W4283204967 date "2022-09-01" @default.
• W4283204967 modified "2023-10-18" @default.
• W4283204967 title "Geochemical and mineralogical studies of zircon, apatite, and chlorite in the giant Dexing porphyry Cu-Mo-Au deposit, South China: Implications for mineralization and hydrothermal processes" @default.
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