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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 PSM.As 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 Na_2O and SiO_2, and removal
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 Formation, 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 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 PSM. As a result, the pelites were transformed into albitolite, which consists of albite totally. Mass balancecalculations show that the PSM process involved additional of large amount of Na 2 O and SiO 2, and removal