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Mantle-derived and crustal He and Ar in the ore-forming fluids of the Xihuashang ranite-associated tungsten ore deposit, South China
Wen-Feng Wei; Rui-Zhong Hu; Xian-Wu Bi; Guo-Hao Jiang; Bing Yan; Run-Sheng Yin; Jie-Hua Yang
2019
Source PublicationOre Geology Reviews
Volume105Pages:605-615
Abstract

The Xihuashan tungsten ore deposit in the central Nanling region, South China is a vein-type hydrothermal deposit associated with the Late Jurassic granitoids that were previously thought to be the products of crustal anatexis alone. In this study, we use helium (He) and argon (Ar) isotopes of fluid inclusions entrapped in pyrite and arsenopyrite to determine the origin of the ore-forming fluids. The 3He/4He ratios of the crushed fluid inclusions vary from 0.15 to 1.16 Ra, with a mean of 0.72 Ra (Ra, the atmospheric 3He/4He ratio of 1.4 × 10−6), indicating the presence of mantle-derived noble gasses in the fluids. The amounts of the mantle-derived noble gasses are estimated to be between ∼2 and 17%. The 40Ar/36Ar ratios of the fluid inclusions vary from 306 to 1023, with an average of 440. These ratios are significantly higher than the average crustal value, indicating the presence of air-saturated water in the volatiles released from the mineral separates. The results from this study indicate that the associated, coeval granitoids, which is believed to provide the ore-forming fluids during magma evolution, are not the products of pure crustal melts. Mantle-derived volatiles and heat was also involved in the genesis of the host granite pluton.

KeywordXihuashan Tungsten Deposit he And Ar Isotopes ore-forming Fluids crust-mantle Interaction south China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10517
Collection矿床地球化学国家重点实验室
Affiliation1.Institute of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3.University of Chinese Academy of Sciences, Beijing 100039, China
Recommended Citation
GB/T 7714
Wen-Feng Wei,Rui-Zhong Hu,Xian-Wu Bi,et al. Mantle-derived and crustal He and Ar in the ore-forming fluids of the Xihuashang ranite-associated tungsten ore deposit, South China[J]. Ore Geology Reviews,2019,105:605-615.
APA Wen-Feng Wei.,Rui-Zhong Hu.,Xian-Wu Bi.,Guo-Hao Jiang.,Bing Yan.,...&Jie-Hua Yang.(2019).Mantle-derived and crustal He and Ar in the ore-forming fluids of the Xihuashang ranite-associated tungsten ore deposit, South China.Ore Geology Reviews,105,605-615.
MLA Wen-Feng Wei,et al."Mantle-derived and crustal He and Ar in the ore-forming fluids of the Xihuashang ranite-associated tungsten ore deposit, South China".Ore Geology Reviews 105(2019):605-615.
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