A sodium metasomatism process in Xiaoqingshan lode-copper deposit in Kangdian region, southwestern China
A sodium metasomatism process in Xiaoqingshan lode-copper deposit in Kangdian region, southwestern China作者机构：Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Chengdu Institute of Technology Chengdu 610059 China
出 版 物：《Chinese Science Bulletin》 (科学通报(英文版))
年 卷 期：1999年第44卷第S2期
页 面：176-178页
学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程]
主 题：sodium metasomatism copper deposit southwestern China.
摘 要：THE Kangdian region is a middle Proterozoic continental rift basin that extends between longitudes 101°30’and 103°20’. There are a series of sedimentary strata, named Xiaoqingshan Formation, Yinmin Forma- tion, and Luoxue Formation. The strata were metamorphosed and deformed in Jinning tectonic event between approximately 850 and 750 Ma. There are many lode-copper deposits in the Kangdian region. Xiaoqingshan is a typical one among of them. The orebodies of the deposit occurs in veins and the hostrocks of the deposit are sericite-phyllite and sericite-slate. The deposit is characterized by large-scale pervasive sodium metasomatism （PSM）. It has been identified that albite replaced sericite and chlorite of the original rocks during the *** a result, the pelites were transformed into albitolite, which consists of albite totally. Mass balancecalculations show that the PSM process involved addition of large amount of Na2O and SiO2, and
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