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《Mineral Deposits》 2005-06
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Stable isotope data from Muluozhai REE deposit in Mianning County, Sichuan Province, and their geological implications

TIAN Shi-hong 1, 2, ZHANG Gui-lan3, HOU Zeng-qian 1, 2, DING Ti-ping 1, 2, XIE Yu-ling3, YUAN Zhong-xin1, BAI Ge1 and ZOU Tian-ren1(1 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; 2 Key Laboratory on Isotope Geology, Ministry of Land and Resources, Beijing 100037, China; 3 Academy of Information of Land and Resources of Inner Mongolia, Hohhot 010020, Inner Mongolia, China; 4 Civil & Environmental Engineering School, Beijing University of Science and Technology, Beijing 100083, China)  
The Muluozhai REE deposit, located about 60 km southwest of Mianning County, Sichuan Province, is the third large LREE deposit in Sichuan. The Muluozhai REE deposit is tectonically located on the northern margin of the Jinpingshan Mountain in the Cenozoic intracontinental orogenic belt of southwestern China. Based on field work, the authors analyzed the essential ores from two tunnels for their carbon, hydrogen, oxygen, and sulfur isotopic components so as to investigate sources of metallogenic fluids in the Muluozhai REE deposit and the relation between the metallogenic fluids and the deep process. The δ 13C_ V-PDB values of fluids from fluid inclusions in quartz and fluorite vary from -2.5 to -9.0 per mil, showing characteristics of mantle-derived carbon. The δD_ V-SMOW values of fluids from fluid inclusions in calcite, quartz, fluorite and bastnaesite range from -63 to -87 per mil, suggesting characteristics of mantle-derived hydrogen. The δ 34S_ V-CDT values of barite and galena vary in narrow ranges of + 0.1~+2.2 per mil and -8.6~-9.3 per mil, respectively, indicating isotopic characteristics of mantle-derived sulfur. The δ 13C_ V-PDB values and the δ 18O_ V-SMOW values of calcite range from -6.6 to -6.8 per mil and from +8.4 to +9.1 per mil, respectively, which are fallen into the range of the “primary carbonatites", implying that carbon and oxygen in ores of Muluozhai ore veins were mainly derived from the depth. The stable isotopic data suggest a mantle source for the REE mineralization and a deep process involving mantle materials and tectonics.
【Fund】: 国家重点基础研究发展规划项目(编号:2002CG412610和G1999043211);; 国家杰出青年基金(编号:40425014);; 中国地质科学院重点开放实验室专项资金(编号:KL05_9)联合资助
【CateGory Index】: P618.7
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