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Origin of the ore-forming fluids of the Tongchang porphyry Cu-Mo deposit in the Jinshajiang-Red River alkaline igneous belt, SW China: Constraints from He, Ar and S isotopes
Leiluo Xu; Xianwu Bi; Ruizhong Hu; Yongyong Tang; Guohao Jiang; Youqiang Qi
通讯作者Xianwu Bi
2014
发表期刊Journal of Asian Earth Sciences
卷号79期号:5页码:884-894
摘要

The Jinshajiang-Red River alkaline igneous belt with abundant Cu-Mo-Au mineralization, in the eastern Indian-Asian collision zone, is an important Cenozoic magmatic belt formed under an intra-continental strike-slip system in southwestern (SW) China. The Tongchang deposit is a representative porphyry Cu-Mo deposit in southern segment of the Jinshajiang-Red River alkaline igneous belt, with 8621 t Cu @ 1.24 wt.% and 17,060 t Mo @ 0.218 wt.%. In this study, He, Ar and S isotopic compositions of the Tongchang deposit were determined. He and Ar isotopic compositions suggest that the ore-forming fluids, with He-3/He-4 ratios varying from 0.17 to 1.50 Ra and Ar-40/Ar-36 ratios from 299.1 to 347.3 for the deposit, are a mixture between a crust-derived fluid (MASW) with near atmospheric Ar and crustal He, and a mantle-derived fluid. However, the delta S-34 values of the hydrothermal pyrite samples ranging from 1.0 parts per thousand to 1.5 parts per thousand with an average of 1.2 parts per thousand, indicate that the sulfur in the ore-forming fluids of the Tongchang deposit was primarily derived from the magma or indirectly mantle-derived without assimilation of crustal sulfur. In combination with previously published He and Ar isotopic data of the Yulong and Machangqing deposits in northern and central segments of the Jinshajiang-Red River alkaline igneous belt, respectively, the ore-forming fluids of the Yulong and Machangqing deposits are obviously richer in He-3 and Ar-40, and poorer in Ar-36 in comparison with the Tongchang deposit, implying that more mantle-derived fluids were involved in the ore-forming fluids of the Yulong and Machangqing deposits than those for the Tongchang deposit. This might be one of the most important factors producing larger scales of mineralization in the Yulong and Machangqing deposits than the Tongchang deposit.

关键词He Ar And s Isotopes Origin Of The Ore-forming Fluid Tongchang Deposit Jinshajiang–red River Alkaline Igneous Belt
学科领域矿床地球化学
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/5186
专题矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
矿床地球化学国家重点实验室
通讯作者Xianwu Bi
推荐引用方式
GB/T 7714
Leiluo Xu,Xianwu Bi,Ruizhong Hu,et al. Origin of the ore-forming fluids of the Tongchang porphyry Cu-Mo deposit in the Jinshajiang-Red River alkaline igneous belt, SW China: Constraints from He, Ar and S isotopes[J]. Journal of Asian Earth Sciences,2014,79(5):884-894.
APA Leiluo Xu,Xianwu Bi,Ruizhong Hu,Yongyong Tang,Guohao Jiang,&Youqiang Qi.(2014).Origin of the ore-forming fluids of the Tongchang porphyry Cu-Mo deposit in the Jinshajiang-Red River alkaline igneous belt, SW China: Constraints from He, Ar and S isotopes.Journal of Asian Earth Sciences,79(5),884-894.
MLA Leiluo Xu,et al."Origin of the ore-forming fluids of the Tongchang porphyry Cu-Mo deposit in the Jinshajiang-Red River alkaline igneous belt, SW China: Constraints from He, Ar and S isotopes".Journal of Asian Earth Sciences 79.5(2014):884-894.
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