新疆乔尕山金矿床成矿流体来源研究  

Research on the origin of ore-forming fluid at Qiaogashan gold deposit, Xinjiang.

作　　者：翟伟[1] 杨荣勇[1] 李兆麟 孙晓明 

机构地区：[1]中山大学地球科学系

出　　处：《岩石学报》2000年第4期531-534,共4页Acta Petrologica Sinica

基　　金：国家自然科学基金 (No.4970 3 0 43 );南京大学内生金属矿床成矿机制研究国家实验室基金资助

摘　　要：对乔尕山金矿床脆韧性剪切变质成矿作用阶段形成的受不同程度剪切的石英脉中流体包裹体气相成分分析表明 ,由糜棱岩化石英脉→初糜棱岩石英脉→石英脉糜棱岩 ,气相成分总量及主要组分 H2 O和 CO2 的含量均呈有规律的降低。两个主要成矿阶段形成的石英脉具有相似的 H、O同位素组成 ,δ1 8OH2 O=5 .2 5‰～ 9.5 4‰ ,δDH2 O=- 70 .9‰～ - 42 .0‰ ,受剪切岩石中矿物流体包裹体所代表的流体是韧性剪切带金矿床成矿流体的主要来源之一 ,剪切变质作用使成矿流体发生均一化作用 ,其 H。The analysis of gas compositions of fluid inclusions in quartz veins, which were formed in metallogenesis of brittle ductile shear metamorphism, and suffered from different grade shearing, shows that from mylonitized quartz vein → primary mylonite quartz vein → quartz vein mylonite, the total contents of gas compositions, the contents of main component H 2O and CO 2 decrease, and the fluid inclusions in minerals of sheared rocks may be one of the main source of ore forming fluid of gold deposit in ductile shear zone. The quartz veins formed in two main metallogenetic stages have similar characteristics of hydrogen and oxygen isotope, δ 18 O H 2O =5.25‰~8.64‰, δD H 2O =-70.9‰^-42.0‰. Ore forming fluids in shear zone were homogenized by shear metamorphism, and the range of hydrogen and oxygen isotope change of ore forming fluid is small.

关 键 词：剪切带 金矿床 成矿流体 成矿作用 变质作用 

分 类 号：P618.51[天文地球—矿床学]