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Mantle-derived gaseous components in ore-forming fluids of the Xiangshan uranium deposit, Jiangxi province, China: Evidence from He, Ar and C isotopes
Rui-Zhong Hu;  P.G. Burnard;  Xian-Wu Bi;  Mei-Fu Zhou;  Jian-Tang Peng;  Wen-Chao Su;  Jun-Hong Zhao
2009
Source PublicationChemical Geology
Volume266Issue:1–2Pages:86-95
Abstract

The Xiangshan U deposit, the largest hydrothermal U deposit in China, is hosted in late Jurassic felsic volcanic rocks although the U mineralization post dates the volcanics by at least 20 Ma. The mineralization coincides with intrusion of local mantle-derived mafic dykes formed during Cretaceous crustal extension in South China. Ore-forming fluids are rich in CO2, and U in the fluid is thought to have been dissolved in the form of UO2 (CO3)2 2− and UO2 (CO3) 3 4− complexes. This paper provides He and Ar isotope data of fluid inclusions in pyrites and C isotope data of calcites associated with U mineralization (pitchblende) in the Xiangshan U deposit. He isotopic compositions range between 0.1 and 2.0Ra (where Ra is the 3 He/4 He ratio of air= 1.39 × 10−6 ) and correlates with 40Ar/36Ar; although there is potential for significant 3 He production via 6 Li(n,α) 3 H(β)3 He reactions in a U deposit (due to abundant neutrons), nucleogenic production cannot account for either the 3 He concentration in these fluids, nor the correlations between He and Ar isotopic compositions. It is more likely that the high 3 He/4 He ratios represent trapped mantle-derived gases. A mantle origin for the volatiles of Xiangshan is consistent with the δ13C values of calcites, which vary from −3.5‰ to −7.7‰, overlapping the range of mantle CO2. The He, Ar and CO2 characteristics of the ore-forming fluids responsible for the deposit are consistent with mixing between 3 He- and CO2-rich mantle-derived fluids and CO2-poor meteoric fluids. These fluids were likely produced during Cretaceous extension and dyke intrusion which permitted mantle-derived CO2 to migrate upward and remobilize U from the acid volcanic source rocks, resulting in the formation of the U deposit. Subsequent decay of U within the fluid inclusions has reduced the 3 He/4 He ratio, and variations in U/3 He result in the range in 3 He/4 He observed with U/3 He ratios in the range 5–17× 103 likely corresponding to U concentrations in the fluids b0.2 ppm.

KeywordThe Xiangshan u Deposit china he, Ar And c Isotopes mantle-derived Volatiles
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8714
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Centre de Recherches Pétrographiques et Géochimiques (CRPG-CNRS), 15 rue Notre Dame des Pauvres, B.P. 20, 54501 Vandoeuvre-les-Nancy Cedex, France
3.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Recommended Citation
GB/T 7714
Rui-Zhong Hu;P.G. Burnard;Xian-Wu Bi;Mei-Fu Zhou;Jian-Tang Peng;Wen-Chao Su;Jun-Hong Zhao. Mantle-derived gaseous components in ore-forming fluids of the Xiangshan uranium deposit, Jiangxi province, China: Evidence from He, Ar and C isotopes[J]. Chemical Geology,2009,266(1–2):86-95.
APA Rui-Zhong Hu;P.G. Burnard;Xian-Wu Bi;Mei-Fu Zhou;Jian-Tang Peng;Wen-Chao Su;Jun-Hong Zhao.(2009).Mantle-derived gaseous components in ore-forming fluids of the Xiangshan uranium deposit, Jiangxi province, China: Evidence from He, Ar and C isotopes.Chemical Geology,266(1–2),86-95.
MLA Rui-Zhong Hu;P.G. Burnard;Xian-Wu Bi;Mei-Fu Zhou;Jian-Tang Peng;Wen-Chao Su;Jun-Hong Zhao."Mantle-derived gaseous components in ore-forming fluids of the Xiangshan uranium deposit, Jiangxi province, China: Evidence from He, Ar and C isotopes".Chemical Geology 266.1–2(2009):86-95.
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