新疆巴音铜矿床硫同位素地球化学研究  

STUDY ON SULFUR ISOTOPE GEOCHEMISTRY OF THE BAYIN COPPER DEPOSIT IN XINJIANG

作　　者：徐文炘[1] 李蘅[1] 邓贵安[1] 庞春勇[1] 

机构地区：[1]桂林矿产地质研究院,广西桂林541004

出　　处：《中国岩溶》2004年第4期339-343,共5页Carsologica Sinica

摘　　要：采用硫同位素方法,对新疆巴音铜矿床硫化物和硫酸盐矿物进行硫同位素测定,获得硫化物和硫酸盐的δ34S值在-17.5‰～+10.0‰,硫同位素富集顺序为δ34S重晶石>δ34S黄铁矿>δ34S辉铜矿>δ34S黄铜矿。对矿床矿物包裹体测定及矿物稳定为-34.37～-38.42;场进行物理化学计算,获得成矿温度约250℃,logfO2为-2.3;pH值为3～6。对矿床δ34SΣS计算,获得logfs2为-8.59～-14.0;logfCO2δ34SΣS为+10‰,指示出矿石硫源来自岩浆与海水硫酸盐混合。The sulfide and sulphate mineral in the Bayin copper deposit, Xinjiang are analyzed by means of sulfur isotope method. It shows that the δ^(34)S value of sulfide and sulphate varies from -17.5‰ to +10.0‰, sulfur isotope enrichment order is δ^(34)S_(barite)>δ^(34)S_(pyrite)>δ^(34)S_(chalcocite)>δ^(34)S_(chalcopyrite). Results from the test to the wrapped mineral body in the deposit and physical chemistry calculation to the mineral stable field show that the temperature is about 250℃ when the deposit forms, and that logf_(CO_2) ranges from -34.37 to -38.42, logfs_2 from -8.59 to -14.0, pH 3 to 6, and logf_(CO_2) is -2.3. The δ^(34)S_(ΣS) is +10‰ by calculating, indicating that the sulfur comes from mixture of magma and sulphate in sea water.

关 键 词：硫同位素 铜矿床 地球化学研究 成矿温度 矿物包裹体 岩浆 矿石 出矿 黄铜矿 黄铁矿 

分 类 号：P618[天文地球—矿床学] P595[天文地球—地质学]