| 四川里庄稀土矿床岩浆碳酸岩的地球化学 |
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| 关键词:carbonatite REE geochemistry isotope geochemistry EMⅠ Lizhuang REE deposit in Sichuan Province |
| 基金项目:本文得到国家重点基础研究发展规划项目（编号：2002CG412610和G1999043211）和国家杰出青年基金项目（编号：40425014)联合资助。 |
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| Geochemistry of Carbonatites in the Lizhuang REE Deposit, Sichuan Province |
| The Lizhuang REE deposit, located about 49 km southwest of Mianning County, Sichuan Province, is a carbonatite veintype deposit hosted in alkali complex rocks. In order to find out the relationship between the carbonatites and the mantle processes, the authors made a systematic study of REE geochemistry and C, O, Sr, and Pb isotopes. The ∑REE contents of carbonatites range from 8393×10-6 to 8402×10-6，with smooth right-dipping distribution patterns that are similar to those of the well-established magmatic carbonatite. The C and O isotopic compositions of the calcite samples from the carbonatite stocks in the Lizhuang REE deposit vary in a very limited range, with the δ13CV-PDB and δ13OV-SMOW values varying in the range of -3.9‰～5.3‰ and 8.7‰～11.9‰, respectively. They are fallen into the range of the "primary igneous carbonatites". The Sr and Pb isotopic compositions of the calcite samples from the carbonatite in the Lizhuang REE deposit are relatively constant, with the 87Sr/86Sr, 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb values varying in the range of 0.706305±0.706997, 18.197~18.220, 15.601~15.604, and 38.401~38.434, respectively. The similarity of Sr and Pb isotopic compositions of the carbonatite with those of EMⅠ suggests an enriched mantle source for the mineralization of rare earth elements. All of these data suggest that the rocks were derived from the metasomatic enriched mantle. |
| TIAN Shihong,ZHANG Guilan,HOU Zengqian,DING Tiping,ZOU Tianren,YUAN Zhongxin,BAI Ge,XIE Yuli.2005.Geochemistry of Carbonatites in the Lizhuang REE Deposit, Sichuan Province[J].Acta Geoscientica Sinica,26(z1):151-155. |
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