| 内蒙古白云鄂博矿床的稀土矿化时代与期次 |
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| 关键词:Bayan Obo REE Sm-Nd isotope system ore-forming epoch episodes of mineralization |
| 基金项目:国家自然科学基金项目(编号: 40973037);国土资源部公益性行业科研专项经费项目(编号: 200911043-14) |
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| Ore-forming Epoch and Episodes of REE Mineralization in the Bayan Obo Ore Deposit, Inner Mongolia |
| 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 is partly due to the lack of consensus on the ore-forming epoch and episodes of REE mineralization. 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. A significant thermal event occurred at ca. 0.44 Ga, resulting in the formation of some veins with coarse crystals of REE minerals such as huanghoite. However, the enrichment of REE during this event resulted from REE remobilization within the ore body itself, and the contribution from external source was minimal. A series of ages between ca. 1.3 Ga and ca. 0.44 Ga resulting from partial disturbance of the isotopic system had no specific meaning for REE mineralization. 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. |
| ZHU Xiang-kun,SUN Jian.2012.Ore-forming Epoch and Episodes of REE Mineralization in the Bayan Obo Ore Deposit, Inner Mongolia[J].Acta Geoscientica Sinica,33(6):845-856. |
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