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 |
ISSN | 1674-7313 |
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. |
DOI | 10.1007/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 | |
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 |
推荐引用方式 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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