Discovery of Cu-Zn,Cu-Sn intermetallic minerals and its significance for genesis of the Mianning-Dechang REE Metallogenic Belt,Sichuan Province,China  

作　　者：XIE Yuling1, HOU Zengqian2, XU Jiuhua1, YUAN Zhongxin2, BAI Ge2 & LI Xiaoyu3 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 

出　　处：《Science China Earth Sciences》2006年第6期597-603,共7页中国科学（地球科学英文版）

摘　　要：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.Mianning-Dechang Himalayan REE Metallogenetic Belt in Sichuan Province liesalong the western margin of the Yangtze Craton. We have conducted detailed mineralogical studies onore minerals collected from Maoniuping and Dalucao, the two largest deposits in the belt. Withoptical microscope, SEM/EDS, and EPMA, three rare intermetallic minerals, i.e., zinccopperite(Cu_2Zn), Sn-bearing native copper, and Cu-bearing jupiter were found to occur in the main ore alongwith barite, fluorite, apatite, sulfide and bastnaesite. Since the conditions under whichzinccopperite and Sn-bearing native copper formed are quite unique, finding of these minerals, forthe first time in domestic REE deposits, has significant implications for the genesis of the oredeposits 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 ofthe Himalayan magma from deep source.

关 键 词：Mianning-Dechang REE METALLOGENETIC belt  Cu-bearing INTERMETALLIC minerals  EPMA  genesis significance  deep source MAGMATIC activity. 

分 类 号：P618.2[天文地球—矿床学]