Institutional Repository of Key Laboratory of Mineral Resources, Chinese Academy of Sciences
| The REE mineralization and remobilization history of the giant Bayan Obo deposit, Inner Mongolia, China | |
| Li XiaoChun1,2; Zhan YunXiang1; Fan HongRui1,2; Yang KuiFeng1,2 | |
| 2022-10-01 | |
| Source Publication | ACTA PETROLOGICA SINICA
 |
| ISSN | 1000-0569 |
| Volume | 38Issue:10Pages:2920-2932 |
| Abstract | The Bayan Obo deposit in Inner Mongolia, China is well known for highly anomalous enrichments in REE. Isotopic dating studies of this deposit have reported complicated age dates, and thus debate persists over the age of mineralization. To better define the formation and evolution history of the deposit, this study conducts in-situ Sm-Nd isotopic analysis on REE-rich minerals ( including monazite, bastnasite and apatite) of the deposit. The analyses show that the Sm-Nd isotope ratios of monazite, bastnasite and deformed apatite are aligned along the reference isochron of 1300 Ma. In addition, the epsilon(Nd) ( t = 1300 Ma) values of these minerals highly approach those of carbonatite dykes around the deposit. Therefore, it is proposed that the primary REE mineralization occurred at similar to 1300Ma, and had a close genetic association with mantle -derived carbonatite. Quite a few undeformed apatite grains are present in the deposit. Most undeformed apatite grains have Sm-Nd isotope ratios aligned along the reference isochron of 450 Ma, indicating that they were generated in the Early Paleozoic time. It is notable that these apatite grains have epsilon(Nd)( t =450Ma) values highly approaching those of monazite and bastnasite, implying that the REE in newly formed apatite were mainly sourced from primary REE minerals. We also identify a small portion of undeformed apatite grains that were formed at similar to 270Ma, and their epsilon(Nd) ( t = 270Ma) values highly approaching those of monazite and bastnasite at the corresponding time. Similarly, the REE in the newly formed apatite were remobilized from previous REE minerals. In general, the primary REE mineralization mainly occur at 1300Ma in the Bayan Obo deposit. The deposit experienced two episodes of overprinting at Early Paleozoic and Late Paleozoic, respectively. The overprinting events did not obviously increase the metal tenor of the deposit, but induced REE remobilization and may change the grade of the ores. |
| Keyword | REEminerals Sm-Ndisotopes Ore.formingage Bayan Obo |
| DOI | 10.18654/1000-0569/2022.10.02 |
| WOS Keyword | ACCUMULATION |
| Language | 英语 |
| WOS Research Area | Geology |
| WOS Subject | Geology |
| WOS ID | WOS:000905324300002 |
| Publisher | SCIENCE PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/106853 |
| Collection | 矿产资源研究院重点实验室 |
| Corresponding Author | Fan HongRui |
| Affiliation | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| First Author Affilication | Key Laboratory of Mineral Resources, Chinese Academy of Sciences |
| Corresponding Author Affilication | Key Laboratory of Mineral Resources, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Li XiaoChun,Zhan YunXiang,Fan HongRui,et al. The REE mineralization and remobilization history of the giant Bayan Obo deposit, Inner Mongolia, China[J]. ACTA PETROLOGICA SINICA,2022,38(10):2920-2932. |
| APA | Li XiaoChun,Zhan YunXiang,Fan HongRui,&Yang KuiFeng.(2022).The REE mineralization and remobilization history of the giant Bayan Obo deposit, Inner Mongolia, China.ACTA PETROLOGICA SINICA,38(10),2920-2932. |
| MLA | Li XiaoChun,et al."The REE mineralization and remobilization history of the giant Bayan Obo deposit, Inner Mongolia, China".ACTA PETROLOGICA SINICA 38.10(2022):2920-2932. |
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