Ore-Forming Epoch and Episodes of REE Mineralization in the Bayan Obo Ore Deposit, Inner Mongolia
详细信息
- 责任者：Zhu Xiangkun (Laboratory of Isotope Geology ; Ministry of Land and Resources ; State Key Laboratory of Continental Dynamics ; Institute of Geology ; Chinese Acadeym of Geological Sciences ; Beijing 100037 ; China) ; Sun Jian
- 刊名：Acta Geoscientica Sinica
- 出版年：2012
- 卷期：33(6)
- 关键词：稀土矿床 ; rare earth deposit ; 钐—钕计时 ; Sm-Nd dating ; 内蒙古 ; Inner Mongolia
- 页码：p.845-856
- 图表：6 illus., 1 table, 51 refs.
- 分类号：1001,1300
- issnNo：ISSN0375-5444
- isbnNo：CN11-1856/P
摘要
The Bayan Obo REE-Fe-Nb ore deposit in Inner Mongolia is world-famous for its extreme enrichment of light rare earth elements; nevertheless, its origin remains controversial. This paper made a detailed review on geochronological data and a re-assessment of Sm-Nd isotopic results in literatures. It is shown that the REE mineralization of Bayan Obo ore deposit occurred at ca.1.3 Ga, consistent with the epoch of carbonatite dyke intrusion in this region, and REE in both the ore deposit and the carbonatite dykes were derived from the mantle. In short, REE in the Bayan Obo ore deposit were enriched by a single episode of mineralization that occurred in Mesoproterozoic and derived from the mantle only.