GEOCHEMISTRY OF THE ASSOCIATED COPPER, SALINE AND ORGANIC DEPOSITS IN THE CHUXIONG BASIN, YUNNAN, CHINA
Ran Chongying, Zhang Zhijun (Kunming University of Science and Technology, China) Zhuang Hanping (Guangzhou Institute of Geochemistry,Chinese Academy of Sciences)
The occurrence and development of paleo continental rift in the Kangdian region brought up a Chuxiong basin, deposited cycles and ore bearing formations of coal, evaporite and copper, and formed the associated organic, copper and saline deposits. Studies of ore deposit geochemistry and organic geochemistry show that the copper, salt and organic matter form the surface, strata or hypogene fluid were generally distributed over the Mesozoic stratum in the Chuxiong basin in trace amount and concentrated into ore deposits in the proper paleoclimatologic and lithofacies paleogeographical environment. The three kinds of matter depended on each other for existence in their ore deposits. The three ore deposits all went through sedimentary,diagenetic and reworked metallizations and all underwent through the same thermal evolution. The genesis of these deposits accords with the mechanism of metal salt organic matter interaction and sedimentary diagenetic reworked metallization.