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Fingerprinting hydrothermal fluids in porphyry Cu deposits using K and Mg isotopes
Li, Weiqiang1; Zhao, Shugao1; Wang, Xiaomin1; Li, Shilei1; Wang, Guoguang1; Yang, Tao1; Jin, Zhangdong2
通讯作者Li, Weiqiang(liweiqiang@nju.edu.cn)
2020
发表期刊SCIENCE CHINA-EARTH SCIENCES
ISSN1674-7313
卷号63期号:1页码:108-120
摘要In this study, we performed an integrated investigation of K and Mg isotopes in hydrothermally altered rocks from the giant Dexing porphyry Cu deposit in China. Both the altered porphyry intrusion and the surrounding wall rocks exhibit large variations in K and Mg isotope compositions, with delta K-41 values ranging between -1.0296 parts per thousand and 0.38 parts per thousand, and delta Mg-26 values ranging between -0.49 parts per thousand and 0.32 parts per thousand. The delta K-41 and delta Mg-26 values of the majority of altered samples are higher than the isotopic baseline values for upper continental crust. We attribute the general increase in delta K-41 and delta Mg-26 in altered rocks to hydrothermal alteration, which caused preferential incorporation of heavy K and Mg isotopes in alteration products, particularly phyllosilicates. However, a few altered samples show anomalously low delta K-41 and delta Mg-26 values. The delta K-41 and delta Mg-26 values do not correlate with K and Mg concentrations, or mineralogy of altered samples. The variable K-Mg isotope data likely reflect fluids of different physical-chemical properties, or different isotopic compositions. Based on the combined K-Mg isotope data, at least three groups of hydrothermal fluids are distinguished from the Dexing porphyry deposit. Therefore, K-Mg isotopes are potentially a novel tracer for fingerprinting fluids in complex hydrothermal systems.
DOI10.1007/s11430-018-9387-2
关键词[WOS]MC-ICP-MS ; COPPER-DEPOSIT ; MO DEPOSIT ; POTASSIUM ; FRACTIONATION ; CONSTRAINTS ; EARTH
收录类别SCI ; SCI
语种英语
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000511955300008
出版者SCIENCE PRESS
引用统计
被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/12777
专题加速器质谱中心
通讯作者Li, Weiqiang
作者单位1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210046, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
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GB/T 7714
Li, Weiqiang,Zhao, Shugao,Wang, Xiaomin,et al. Fingerprinting hydrothermal fluids in porphyry Cu deposits using K and Mg isotopes[J]. SCIENCE CHINA-EARTH SCIENCES,2020,63(1):108-120.
APA Li, Weiqiang.,Zhao, Shugao.,Wang, Xiaomin.,Li, Shilei.,Wang, Guoguang.,...&Jin, Zhangdong.(2020).Fingerprinting hydrothermal fluids in porphyry Cu deposits using K and Mg isotopes.SCIENCE CHINA-EARTH SCIENCES,63(1),108-120.
MLA Li, Weiqiang,et al."Fingerprinting hydrothermal fluids in porphyry Cu deposits using K and Mg isotopes".SCIENCE CHINA-EARTH SCIENCES 63.1(2020):108-120.
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