| Trace and Rare Earth Element Geochemistry of Micrite Mound Carbonates and Other Related REE Mineralized Carbonates from Bayan Obo Area in Inner Mongolia |
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| 作者姓名： | 杨晓勇 郑永飞 杨学明 章雨旭 彭阳 裘丽雯 |
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| 作者单位： | School of Earth and Space Sciences，University of Science and Technology of China，Hefei 230026，China，The State Key Laboratory for Mineral Deposit Research，Nanjing University，Nanjing 200093，China，School of Earth and Space Sciences，University of Science and Technology of China，Hefei 230026，China，School of Earth and Space Sciences，University of Science and Technology of China，Hefei 230026，China，Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037，China，Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037，China，The State Key Laboratory for Mineral Deposit Research，Nanjing University，Nanjing 200093，China |
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| 基金项目： | 科技部资助项目，国家自然科学基金，中国科技大学校科研和教改项目 |
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| 摘 要： | Whatismicritemound?Itisthegeological body,whichismadefrommicro carbonate,micro andothersubstancesformedataspecificenviron ment,whoseshapeislikesmallhill1,2].However, itcannotbefoundinthepre Cambriansedimentary rocksduetotheverystrongalterationduringthe…
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| 关 键 词： | 地球化学 碳酸盐 泥晶灰岩 元素追踪 稀土元素 |
Trace and Rare Earth Element Geochemistry of Micrite Mound Carbonates and Other Related REE Mineralized Carbonates from Bayan Obo Area in Inner Mongolia |
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| Yang Xiaoyong,Zheng Yongfei,YANG Xueming,Zhang Yuxu,PENG yang,Qiu Liwen.Trace and Rare Earth Element Geochemistry of Micrite Mound Carbonates and Other Related REE Mineralized Carbonates from Bayan Obo Area in Inner Mongolia[J].Journal of Rare Earths,2005,23(2):129-137. |
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| Authors: | Yang Xiaoyong Zheng Yongfei YANG Xueming Zhang Yuxu PENG yang Qiu Liwen |
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| Abstract: | Geochemical study on trace and rare earth element geochemistry was carried out for different carbonates including the very REE-rich ones in the main ore bodies, a carbonatite dyke and two micrite mounds from Heilaobao far away from the Bayan Obo ore deposit, and Xishan in west Beijing. The results show that both carbonatite dyke and REE mineralized carbonates (dolomite and marble) in the main ore bodies and outside ore bodies have similarities to each other, with very extreme positive anomaly of Ba, Th, Nb, La, Ce, Nd, Sm, Pb, medium positive anomaly of Y, Ho, Tb, Er, Yb and negative anomaly of Sc, Ti and Cu. The REE concentration in the mineralized carbonates changes greatly, the total REE content changes from 262×10-6 in both east and west ore deposits to 104562 ×10-6 (10.46%), which is relatively lower than those samples of carbonatite dyke, whose REE contents vary greatly, from 1% up to 20 % of mass fraction. Light REE in the carbonatites are enriched and highly fractionated relative to heavy REE and there is no Eu anomaly. The REE distribution patterns of both mineralized carbonate and carbonatite dyke are of some similarities. However, the sedimentary carbonate micrite of Salinhudong Group in Heilaobao far outside the ore bodies and the pure carbonates from Xishan in Beijing, central part of North China plate, have the similarities in REE distributions with much lower REE contents, which are significantly different from those of carbonatite dyke and REE mineralized carbonate. In Bayan Obo district, both carbonates in the ore deposit and micrite mound outside the ore deposit underwent widespread metasomatism by fluids that resulted in formation of the superlager Fe-Nb-REE mineralization. It appears that the carbonates represent the evolution products of different geological stages. |
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| Keywords: | geochemistry carbonate micrite mound trace element rare earth element Bayan Obo |
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