Origin and tectonic environment of the Longbohe Fe-Cu-(LREE) deposit in the Ailao Shan-Red River shear zone, Southwest China: a Neoproterozoic subduction-related IOCG deposit?
文献类型：期刊论文
| 作者 | Liu, Lei1,5; Chen, Wei Terry1,5; Li, Xiao-Chun1,2; Zhao, Xin-Fu3,4 |
| 刊名 | MINERALIUM DEPOSITA
 |
| 出版日期 | 2023-08-04 |
| 页码 | 24 |
| ISSN号 | 0026-4598 |
| 关键词 | Longbohe deposit C-O-S-Hf isotopes Zircon U-Pb dating Subduction-related IOCG deposits |
| DOI | 10.1007/s00126-023-01198-4 |
| 英文摘要 | The Longbohe Fe-Cu-(LREE) deposit in the Longbohe-Sin Quyen (LSQ) Fe-Cu belt in the border zone of South China and northern Vietnam has a resource of > 1 million tonnes Cu, and was once speculated to be a potentially important subduction-related deposit of Precambrian age, but with poor constraints. Our study reveals that the major Fe-, Cu-, and LREE mineralization comprises three stages and are comparable to typical IOCG deposits worldwide. Stage I is characterized by pervasive Na alteration, followed by Fe mineralization stage (Stage II) consisting of Ti-poor magnetite associated with Ca-Na alteration forming amphibole and albite. Stage III, the Cu-LREE mineralization stage, is composed mainly of chalcopyrite and REE-rich allanite with minor pyrrhotite and pyrite. Stages I and II formed at broadly comparable temperatures of 515 to 670 degrees C, and have delta O-18 fluid values of 4.3 to 11.7 parts per thousand, indicating dominantly magmatic fluids. Furthermore, they have hydrothermal zircon with epsilon(Hf(t)) values (7.5 to 12.7) similar to coeval mafic intrusions in the region, likely indicating a mafic magma-source for the fluids. Stage III fluids have lower temperatures (332 to 402 degrees C) but exhibit magmatic-like delta S-34 values (1.2 to 3.7 parts per thousand) similarly suggestive of a major magmatic source. However, they have distinctly lower epsilon(Hf(t)) and epsilon(Nd(t)) values comparable to those of coeval regional felsic intrusions, suggesting that an additional component of REE-rich external fluid from felsic magmas was involved during the Cu-REE mineralization. Hydrothermal zircons from Stages II and III have similar U-Pb ages of similar to 850 Ma, providing tight constraints on the timing of Fe-Cu mineralization. The new U-Pb ages indicate that the Longbohe deposit is coeval with the Sin Quyen IOCG deposit in northern Vietnam, and with the regional subduction-related magmatism, indicating that the Longbohe-Sin Quyen belt is of Neoproterozoic age and formed in a convergent setting. |
| WOS关键词 | ZIRCON U-PB ; OXIDE-COPPER-GOLD ; YINACHANG FE-CU-(REE) DEPOSIT ; DIANCANG MOUNTAIN-RANGES ; HF ISOTOPIC COMPOSITIONS ; LARGE IGNEOUS PROVINCE ; LEFT-LATERAL SHEAR ; GEOCHEMICAL CONSTRAINTS ; NORTHEASTERN MARGIN ; METAMORPHIC ROCKS |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:001040823600001 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/111361]  |
| 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 | Chen, Wei Terry |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 4.China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China 5.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Lei,Chen, Wei Terry,Li, Xiao-Chun,et al. Origin and tectonic environment of the Longbohe Fe-Cu-(LREE) deposit in the Ailao Shan-Red River shear zone, Southwest China: a Neoproterozoic subduction-related IOCG deposit?[J]. MINERALIUM DEPOSITA,2023:24. |
| APA | Liu, Lei,Chen, Wei Terry,Li, Xiao-Chun,&Zhao, Xin-Fu.(2023).Origin and tectonic environment of the Longbohe Fe-Cu-(LREE) deposit in the Ailao Shan-Red River shear zone, Southwest China: a Neoproterozoic subduction-related IOCG deposit?.MINERALIUM DEPOSITA,24. |
| MLA | Liu, Lei,et al."Origin and tectonic environment of the Longbohe Fe-Cu-(LREE) deposit in the Ailao Shan-Red River shear zone, Southwest China: a Neoproterozoic subduction-related IOCG deposit?".MINERALIUM DEPOSITA (2023):24. |
入库方式： OAI收割
来源：地质与地球物理研究所
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