Rb-Sr geochronology and geochemistry of the Xiaotongchang basalt-hosted Copper deposit in the Jinping area, SW China
文献类型：期刊论文
| 作者 | Shen, Xiaoli4; Zhang, Baolin1,2,3; Du, Qingxiang4; Su, Yanping3 |
| 刊名 | ORE GEOLOGY REVIEWS
 |
| 出版日期 | 2019-09-01 |
| 卷号 | 112页码:15 |
| 关键词 | Basalt-hosted copper deposit Emeishan flood basalts Chalcopyrite Hydrothermal mineralization |
| ISSN号 | 0169-1368 |
| DOI | 10.1016/j.oregeorev.2019.103021 |
| 英文摘要 | The Xiaotongchang basalt-hosted copper deposit in Jinping, southern Yunnan Province, SW China, is located in the southern part of the Emeishan large igneous province. Here, we use Rb-Sr, Re-Os and S-Pb-C-O isotope data to constrain the age and genesis of the deposit. Petrological investigations reveal two main stages of mineralization. The early-stage is characterized by disseminated or massive sulfides in an assemblage of pyrite + chalcopyrite + quartz + albite + calcite. Rb-Sr isotopic dating of early-stage chalcopyrite yields an age of 256 +/- 9.4 Ma (MSWD = 5.4), which is slightly younger than the eruption age of the Jinping basalts. The delta S-34(CDT) values of the sulfides range from +5.8 parts per thousand to +7.7 parts per thousand, suggesting that the metals of the early-stage copper mineralization originated from the Emeishan basalts and that the ore-forming fluids were contaminated by crustal rocks. These units may indicate that the early-stage orebodies represents syngenetic hydrothermal mineralization related to the eruption of Emeishan flood basalts. The late-stage mineralization is characterized by a pyrite + chalcopyrite + bornite + chalcocite + quartz + calcite assemblage that is developed in veins or breccia. The Re-Os isotopic dating of late-stage chalcopyrite samples reveals that they formed at 240-231 Ma. The Pb isotopic compositions ((Pb-206/Pb-204)t = 17.521-19.227, (Pb-207/Pb-204)t = 15.480-15.760, and (Pb-208/Pb-204)t = 37.778-38.731; t = 235 Ma) show that the late-stage copper orebodies have a heterogeneous source and originated mainly from the crust. The late-stage sulfides have higher delta S-34(CDT) values (+7.9 parts per thousand to +10.7 parts per thousand) than the early-stage sulfides. The narrow range of sulfur isotopic compositions of the sulfides associated with both stages and the Pb isotopic compositions of late-stage chalcopyrite indicate that some of the metals associated with late-stage mineralization originated from the Jinping basalts. The C-O isotopic compositions of calcite samples show that the magmatic hydrothermal fluids in the late stage flowed through and were contaminated by the Maokou limestone. Therefore, we suggest that the late-stage orebodies represent magmatic hydrothermal mineralization associated with the Late Triassic rhyolite porphyry and that the tectono-magmatic hydrothermal fluid remobilized copper from the basalts. The copper deposits formed at favourable interfaces within the basalt stratigraphy or in favorable structural locations. |
| WOS关键词 | LARGE IGNEOUS PROVINCE ; ZIRCON U-PB ; EMEISHAN-FLOOD-BASALTS ; JINSHAN GOLD DEPOSIT ; MOLYBDENITE RE-OS ; GUIZHOU PROVINCE ; YUNNAN PROVINCE ; SOUTHWEST CHINA ; ZN DEPOSIT ; ISOTOPE GEOCHEMISTRY |
| 资助项目 | Natural Science Foundation of China[41502064] ; Natural Science Foundation of China[41602110] ; Natural Science Foundation of China[41503059] ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents[2017RCJJ029] ; Project of Shandong Province Higher Educational Science and Technology Program[J18KA213] ; Qingdao Postdoctoral Applied Research Project[2015193] |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:000487168100001 |
| 出版者 | ELSEVIER |
| 资助机构 | Natural Science Foundation of China ; Natural Science Foundation of China ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents ; Project of Shandong Province Higher Educational Science and Technology Program ; Project of Shandong Province Higher Educational Science and Technology Program ; Qingdao Postdoctoral Applied Research Project ; Qingdao Postdoctoral Applied Research Project ; Natural Science Foundation of China ; Natural Science Foundation of China ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents ; Project of Shandong Province Higher Educational Science and Technology Program ; Project of Shandong Province Higher Educational Science and Technology Program ; Qingdao Postdoctoral Applied Research Project ; Qingdao Postdoctoral Applied Research Project ; Natural Science Foundation of China ; Natural Science Foundation of China ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents ; Project of Shandong Province Higher Educational Science and Technology Program ; Project of Shandong Province Higher Educational Science and Technology Program ; Qingdao Postdoctoral Applied Research Project ; Qingdao Postdoctoral Applied Research Project ; Natural Science Foundation of China ; Natural Science Foundation of China ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents ; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents ; Project of Shandong Province Higher Educational Science and Technology Program ; Project of Shandong Province Higher Educational Science and Technology Program ; Qingdao Postdoctoral Applied Research Project ; Qingdao Postdoctoral Applied Research Project |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/93892]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Du, Qingxiang |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 4.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Shandong Prov Key Lab Deposit Mineralizat & Sedim, Qingdao 266590, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shen, Xiaoli,Zhang, Baolin,Du, Qingxiang,et al. Rb-Sr geochronology and geochemistry of the Xiaotongchang basalt-hosted Copper deposit in the Jinping area, SW China[J]. ORE GEOLOGY REVIEWS,2019,112:15. |
| APA | Shen, Xiaoli,Zhang, Baolin,Du, Qingxiang,&Su, Yanping.(2019).Rb-Sr geochronology and geochemistry of the Xiaotongchang basalt-hosted Copper deposit in the Jinping area, SW China.ORE GEOLOGY REVIEWS,112,15. |
| MLA | Shen, Xiaoli,et al."Rb-Sr geochronology and geochemistry of the Xiaotongchang basalt-hosted Copper deposit in the Jinping area, SW China".ORE GEOLOGY REVIEWS 112(2019):15. |
入库方式： OAI收割
来源：地质与地球物理研究所
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