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- W3201310033 endingPage "104475" @default.
- W3201310033 startingPage "104475" @default.
- W3201310033 abstract "• Molybdenum isotope analysis together with other geochemical analyses was applied to a hydrothermal uranium deposit hosted in subvolcanic granitic porphyry rocks in Xiangshan, South China. • Two different fluids were identified for hydrothermal alteration and mineralisation processes in the Baquan uranium deposit. • Subducting slab-derived fluid was responsible for the alteration of granitic porphyry. • Fluid originated from Cretaceous red-bed basin brine evolved into the ore-forming fluid which gave rise to the uranium mineralisation. The Baquan uranium deposit is one of the hydrothermal uranium deposits in the Xiangshan volcanic uranium ore field and is hosted in subvolcanic granitic porphyry rocks (GPRs). To constrain sources of the hydrothermal fluids and metals for alteration and mineralisation, respectively, we analysed the chemical compositions of chlorites and pyrites formed during alteration and mineralisation processes, in-situ sulfur isotope compositions of pyrites, whole-rock compositions and sulfur and molybdenum isotopes of the least-altered and altered GPRs, and mineralised GPRs (i.e. uranium ores). The results show distinct differences in mineralogical and geochemical features of the hydrothermally altered GPRs and uranium ores, which are as follows: (1) In the altered GPRs, hydrothermal chlorites (chlorite-I) are mainly daphnite with higher Fe/(Fe + Mg) (0.70–0.75) but lower Fe 3+ /Fe 2+ (∼0.014), and hydrothermal pyrites (pyrite-I) have low Co and Ni contents (<0.05% and <0.04%, respectively) and a narrow range of δ 34 S (9.11–9.87‰). In contrast, hydrothermal chlorites (chlorite-II) in the ores are ripidolite and brunsvigite with lower Fe/(Fe + Mg) (0.43–0.62) but higher Fe 3+ /Fe 2+ (∼0.056), and hydrothermal pyrites (pyrite-II) have high Co and Ni contents (0.02–0.3% and 0.01–0.11%, respectively) and a wide range of δ 34 S values (2.32–13.8‰). (2) The altered GPRs have Zr and Hf contents (135–187 ppm and 3.39–4.34 ppm, respectively) similar to those of the least-altered GPRs (162–169 ppm, and 3.79–4.01 ppm, respectively), whereas the ores have elevated Zr and Hf contents (184–548 ppm and 4.17–11.6 ppm, respectively). (3) The δ 98 Mo values of the altered GPRs (0.39–0.99‰) and uranium ores (0.52–1.74‰) show contrasting correlations with K 2 O or Na 2 O contents. These differences suggest that hydrothermal alteration and mineralisation in the Baquan deposit may have been caused by two fluids of different origins. Based on these characteristics and comparisons with possible sources, we suggest that the fluid responsible for the alteration of GPRs most likely originated from the subducting slab, whereas the mineralising fluid forming the Baquan uranium deposit likely originated from the brine of a nearby Cretaceous basin. The uranium in the deposit mainly originated through leaching of the volcanic rocks by the brine-derived hydrothermal fluid." @default.
- W3201310033 created "2021-09-27" @default.
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- W3201310033 creator A5035045319 @default.
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- W3201310033 creator A5073799726 @default.
- W3201310033 date "2021-12-01" @default.
- W3201310033 modified "2023-09-29" @default.
- W3201310033 title "Different hydrothermal fluids inducing alteration and uranium mineralisation in the Baquan deposit of the Xiangshan uranium ore field: Constraints from geochemistry of altered rocks and ores" @default.
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