新疆阿合奇县布隆石英重晶石脉型金矿地质特征和硫、氦、氩同位素研究  

Geological Features and S, He and Ar Isotopic Studies of the Bulong Quartz——Barite Vein-type Gold Deposit in Akqi County, Xinjiang

作　　者：杨富全[1] 王义天[1] 毛景文[1] 杜红星[2] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]新疆地质矿产勘查开发局第八地质大队,阿克苏843000

出　　处：《地质论评》2004年第1期87-98,共12页Geological Review

基　　金：国家重点基础研究发展规划项目(编号 2001CB 409807)的成果

摘　　要：位于新疆西南天山阿合奇县的布隆金矿赋存于上泥盆统细碎屑岩中,金矿体受层间缓倾斜破碎带控制,矿区内发育重晶石脉、石英大脉、石英重晶石脉,但金矿体只产于石英重晶石脉中,为一种比较少见的石英重晶石脉型金矿床。矿石中黄铁矿的 δ^(34)S 值变化于14.6‰～19.2‰,重晶石的 δ^(34)S 值介于35.0‰～39.6‰,反映硫来自于地层。黄铁矿流体包裹体的~3He/~4He 比值为0.24～0.82 R/Ra,趋近于地壳特征值。^(40)Ar/^(36)Ar=338～471,略高于大气氩的同位素组成。^(40)Ar/~4He 比值0.015～0.412,平均为0.153,与地壳^(40)Ar/~4He 比值(0.156)一致。成矿流体的He、Ar 同位素组成特征反映了成矿流体主要来源于地壳。The Bulong gold deposit, located in the southwestern Tianshan Mountains of Xinjiang, occurs in the upper Devonian fine clastic rocks, controlled by the fracture zones. The gold deposition mainly occurs in the quartz-barite veins, although pure barite and quartz veins are also developed in the gold district. Therefore, the Bulong gold deposit is of a quartz-barite vein-type, a rare gold type in Xinjiang. The δ34S values of pyrite range from 14. 6‰ to 19. 2‰,and those of barite from 35. 0‰ to 39. 6‰, which indicate that the sulfur comes from the strata. The 3He/4He ratios of fluid inclusions in pyrite are 0. 24 to 0. 82 R/Ra, close to that of the crust. The 40Ar/36Ar ratios are 338 to 471, slightly higher than that of the atmosphere. The 40Ar/4He ratios of the ore-forming fluids are 0. 015 to 0. 412 with a mean of 0. 153,which is consistent with the value of the crust (0. 156). Helium and argon isotope compositions of fluid inclusions show that the ore-forming fluids are mainly derived from the crust.

关 键 词：石英重晶石脉型金矿床矿床地质特征 硫同位素 氦同位素 氩同位素 新疆 

分 类 号：P618.51[天文地球—矿床学]