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| Discovery of Cu-Zn,Cu-Sn intermetallic minerals and its significance for genesis of the Mianning-Dechang REE Metallogenic Belt,Sichuan Province,China | |
| 基金项目： | 国家重点基础研究发展计划(973计划) |
| 摘 要： | The Mianning-Dechang REE metallogenetic belt is among the most important of its kind in China. The typical geologic features and multiple economically- valuable components in this belt have caught attention from more and more geologists. Wide investigations from petrology, petrochemistry to rare earth and trace element geochemistry, have been carried out recently, and a large quantity of geochemical data have already been obtained1―11]. Maoniuping REE deposit is the largest of this belt,… |
| 收稿时间： | 26 August 2004 |
| 修稿时间： | 11 April 2005 |
Discovery of Cu-Zn, Cu-Sn intermetallic minerals and its significance for genesis of the Mianning-Dechang REE Metallogenic Belt, Sichuan Province, China |
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| Authors: | XIE Yuling HOU Zengqian XU Jiuhua YUAN Zhongxin BAI Ge LI Xiaoyu |
| Institution: | 1. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 3. The 109th Geological Team, Sichuan Bureau of Mineral Exploration, Chengdu 610100, China |
| Abstract: | Mianning-Dechang Himalayan REE Metallogenetic Belt in Sichuan Province lies along the western margin of the Yangtze Craton. We have conducted detailed mineralogical studies on ore minerals collected from Maoniuping and Dalucao, the two largest deposits in the belt. With optical microscope, SEM/EDS, and EPMA, three rare intermetallic minerals, i.e., zinccopperite (Cu2Zn), Sn- bearing native copper, and Cu-bearing jupiter were found to occur in the main ore along with barite, fluorite, apatite, sulfide and bastnaesite. Since the conditions under which zinccopperite and Sn- bearing native copper formed are quite unique, finding of these minerals, for the first time in domestic REE deposits, has significant implications for the genesis of the ore deposits in which they occur. In comparison with Cu-Zn intermetallic minerals in other occurrences, we propose that the formation of this REE metallogenetic belt is associated with fast upwelling of the Himalayan magma from deep source. |
| Keywords: | Mianning-Dechang REE metallogenetic belt Cu-bearing intermetallic minerals EPMA gene-sis significance deep source magmatic activity |
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