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Precambrian metamorphic crustal basement cannot provide much gold to form giant gold deposits in the Jiaodong Peninsula, China

文献类型：期刊论文

作者Wang, Zaicong1; Xu, Zhe1; Cheng, Huai1; Zou, Yi2; Guo, Jinghui2; Liu, Yanhong2; Yang, Jinhui2; Zong, Keqing1; Xiong, Le1; Hu, Zhaochu1
刊名PRECAMBRIAN RESEARCH
出版日期2021-03-01
卷号354页码:10
ISSN号0301-9268
关键词Gold deposit Jiaodong Metamorphic crust basement Crustal xenolith Precambrian
DOI10.1016/j.precamres.2020.106045
英文摘要The Jiaodong gold deposits, eastern China define a giant gold province in the Precambrian high-grade metamorphic crustal basement. Given the early metamorphism, the crustal basement would have been so depleted in gold that cannot be the main source for the later Mesozoic gold deposits. However, previously reported gold contents from crustal rocks were variably high (e.g., >5-10 ppb) and often interpreted to reflect the contribution of crustal basement. In this study, after careful field sampling, we obtained high-precision Au and S contents (with Cu and Ag for many samples) to solve the controversial issue. The Au contents were determined by internal standardization to platinum which was obtained from isotope dilution via high-sensitivity Element XR, and/or another independent method by GFAAS after polyurethane foam pretreatment. These methods achieved low procedural blanks (<0.02 ppb) and reliable analyses of low-Au samples. The analyzed metamorphic crustal rocks are from surface outcrops (n = 30) and crustal xenoliths (n = 10) in the Jiaobei terrane, where hosts the predominant Jiaodong gold resources (>85% of 5000 t). The Archean and Paleoproterozoic metamorphic outcrop rocks were sampled far from gold deposits and faults with the minimum effect of ore-forming fluids, and they display overall low Au contents (0.20 +/- 0.18 ppb and 0.47 +/- 0.29 ppb, respectively). More importantly, the crustal xenoliths trapped in pre-mineralization Guojialing granodiorites were not affected by hydrothermal overprint and better reflect the pristine features of the metamorphic basement. Although the crustal xenoliths contain variable sulfides with a wide range of Cu, Ag and S contents, they show rather low Au contents (0.18 +/- 0.15 ppb). These results indicate the strong depletion of Au contents in the Precambrian crustal basement, consistent with the metamorphic devolatilization model. The Precambrian metamorphic crustal basement thus was rather difficult as the main gold source for the Jiaodong gold deposits, suggesting alternative sources.
资助项目National Key R&D Program of China[2016YFC0600103] ; National Natural Science Foundation of China[41722302] ; National Natural Science Foundation of China[41673027]
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000615712000008
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/100136]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wang, Zaicong
作者单位1.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Zaicong,Xu, Zhe,Cheng, Huai,et al. Precambrian metamorphic crustal basement cannot provide much gold to form giant gold deposits in the Jiaodong Peninsula, China[J]. PRECAMBRIAN RESEARCH,2021,354:10.
APA Wang, Zaicong.,Xu, Zhe.,Cheng, Huai.,Zou, Yi.,Guo, Jinghui.,...&Hu, Zhaochu.(2021).Precambrian metamorphic crustal basement cannot provide much gold to form giant gold deposits in the Jiaodong Peninsula, China.PRECAMBRIAN RESEARCH,354,10.
MLA Wang, Zaicong,et al."Precambrian metamorphic crustal basement cannot provide much gold to form giant gold deposits in the Jiaodong Peninsula, China".PRECAMBRIAN RESEARCH 354(2021):10.

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来源：地质与地球物理研究所

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