Haoqin-North Jianshan Thrust Fault and its constraints on the extension of ore-bearing carbonatite in the Bayan Obo area
文献类型：期刊论文
| 作者 | Zhao YuLong5,6; Zhang JiEn5,6; Fan HongRui1,6; Xu Ya3,6; Wang Jian2,6; Zhao YongGang4; Wang QiWei4; Tan XiaoBo5,6 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2023-10-01 |
| 卷号 | 39期号:10页码:2910-2926 |
| ISSN号 | 1000-0569 |
| 关键词 | Bayan Obo Thrust structure Haoqin-North Jianshan Thrust Fault Paleozoic Proterozoic |
| DOI | 10.18654/1000-0569/2023.10.04 |
| 英文摘要 | The Bayan Obo deposit is the largest Rare Earth Element ( REE) mine in the world, and its reservation affects the global REE resources. The REE resources are preserved in carbonatite, and due to limited drilling depth, the depth of the carbonatite body has been debated as a theoretical deep -extended magmatic vent or limited extension ( ca. 2.5km) revealed by a 3-dimensional S -wave velocity structure. To resolve this debate, we did a lithological-structural mapping of the Bayan Obo deposit and its surrounding areas to constrain map -view structures that can correlate structures in-depth. In this study, a megathrust has been found along Haoqin, North Jianshan, and Northwest Orebody, and it is termed as "Haoqin-North Jianshan Thrust Fault". The footwall rocks of the deposit consists of interlayered sandstones, limestones and mudstones. The detrital apatite of the youngest group in sandstone yields a lower intersection age at 1284 +/- 104Ma, and the detrital zircon at 1179 +/- 8 Ma, both of which are younger than the age of the Bayan Obo carbonatite bodies ( ca. 1. 3Ga). Combined with the occurrence of Cambrian -Ordovician fossils in limestone and mudstone/chert, sediments in the footwall are constrained to be the Early Paleozoic. The hanging wall comprises of mylonitic conglomerate and quartz sandstone, slate and ore -bearing carbonatite. Among them, the quartz sandstone has two peaks of detrital zircons at 1.94Ga and 2.55Ga, and is intruded by ca. 1.3Ga carbonatite, demonstrating that they were deposited in the Paleoproterozoic era. The Haoqin-North Jianshan Thrust Fault transports Proterozoic metasediments and ore -bearing carbonatite over the Paleozoic rocks. On the fault surface, fault gouge and breccia widely occur with thicknesses ranging from 20cm to 7m. Hematite is formed by iron -bearing fluid injected along the fault plane, and the dipping angle of the fault plane varies greatly from horizontal to vertical, which may be the result of the influence of late folding. In the Bayan Obo area, the thrust truncates Permian granite as the youngest geological body, and both have been unconformably covered by Cretaceous conglomerate and sandstone, constraining the age of the Haoqin-North Jianshan Thrust Fault to the Permian-Cretaceous period. According to the northmost Shuiyuantou klippe of meta -quartz sandstone, and similar four NE-SW striking en -echelon aeromagnetic anomaly belts between the Bayan Obo deposit and that at about 30km to the south, the displacement of this thrust is constrained to be 8-30km. The Bayan Obo orebody-bearing carbonatite is located in the hanging wall of the fault, and is far transported from its root. It further demonstrates that the abrupt change of shear wave velocity in the Bayan Obo deposit may represent different rock units that have been juxtaposed by this thrust fault. |
| WOS关键词 | DEPOSIT |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:001085199300004 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/110727]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 地质与地球物理研究所_中国科学院油气资源研究重点实验室 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 | Zhang JiEn |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resource Res, Beijing 100029, Peoples R China 4.Baotou Iron & Steel Grp Co Ltd, Baotou 014000, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao YuLong,Zhang JiEn,Fan HongRui,et al. Haoqin-North Jianshan Thrust Fault and its constraints on the extension of ore-bearing carbonatite in the Bayan Obo area[J]. ACTA PETROLOGICA SINICA,2023,39(10):2910-2926. |
| APA | Zhao YuLong.,Zhang JiEn.,Fan HongRui.,Xu Ya.,Wang Jian.,...&Tan XiaoBo.(2023).Haoqin-North Jianshan Thrust Fault and its constraints on the extension of ore-bearing carbonatite in the Bayan Obo area.ACTA PETROLOGICA SINICA,39(10),2910-2926. |
| MLA | Zhao YuLong,et al."Haoqin-North Jianshan Thrust Fault and its constraints on the extension of ore-bearing carbonatite in the Bayan Obo area".ACTA PETROLOGICA SINICA 39.10(2023):2910-2926. |
入库方式： OAI收割
来源：地质与地球物理研究所
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