陆相次火山岩型铜银矿床稳定同位素地球化学研究  

Stable Isotope Geochemistry of Continental Subvolcanic Cu-Ag Ore Deposits

作　　者：徐文炘[1] 李蘅[1] 李毅[1] 陈民扬[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：《地球学报》2004年第2期114-118,共5页Acta Geoscientica Sinica

基　　金：原中国有色金属工业总公司科技局 (1999)项目资助

摘　　要：中国陆相次火山岩型铜银矿床分布广泛 ,银矿与酸性岩有关 ,铜矿与次英安玢岩有关。形成时代为燕山早、晚期。石英的δ18O值在 +7.9‰～ +16 .3‰之间 ,δ18OH2 O值在 - 3.0‰～ +8.1‰之间 ,δD在 - 5 5‰～ - 10 6‰之间。硫化物的δ3 4 S值在 - 9.8‰～ +9.6‰之间 ,硫化物的硫同位素富集顺序为δ3 4 SPy>δ3 4 SSp>δ3 4 SGn>δ3 4 SPo,硫化物矿物对平衡温度在 16 0～4 0 0℃ ,大多数溶液的硫同位素平均组成 (δ3 4 SΣS)为 +2‰～ +5‰ ,个别为 +2 0‰。Continental subvolcanic Cu-Ag ore deposits are widely distributed in China. The formation of Ag deposits is related to acidic rocks and that of Cu deposits to subdacite. The formation epoch seems to be early and late Yanshanisn. The δ 18 O values of quartz,the δ 18 O_ H_2O values,the δD values and the δ 34 S values of sulfides are from +7.9‰ to +16.3‰,from -3.0‰ to +8.1‰,from -55‰ to -106‰,and from -9.8‰ to +9.6‰,respectively. The enrichment of S isotopes in sulfides is in order of δ 34 S_ Py ,δ 34 S_ Sp ,δ 34 S_ Gn ,and δ 34 S_ Po . The equilibration temperatures of sulfide ores are from 160 ℃ to 400 ℃.The values of S isotopes in solution are mostly from +2‰ to +5‰,with a few being +20‰.

关 键 词：陆相次火山岩型铜银矿床 稳定同位素地球化学 硫同位素 酸性岩 次英安玢岩 

分 类 号：P618.41[天文地球—矿床学] P618.52[天文地球—地质学]