新疆乔尕山金矿床稀土元素地球化学特征及其意义  

Geochemical Characteristics and Significance of Rare Earth Elements at Qiaogashan Gold Deposit, Xingjiang

作　　者：翟伟[1] 杨荣勇[1] 李兆麟[1] 孙晓明[1] 

机构地区：[1]中山大学地球科学系,广东广州510275

出　　处：《中山大学学报（自然科学版）》2000年第6期101-106,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目!( 4 970 30 4 3);南京大学内生金属矿成矿机制研究国家实验室基金资助项目

摘　　要：乔尕山金矿床为产于中天山脆韧性剪切带中的石英脉型或破碎带蚀变岩型金矿床 ,南部矿床产于受剪切的志留泥盆系地层中 ,北部矿床产于受剪切的闪长岩体中 .不同阶段形成的含金石英脉及其赋矿围岩具有相似的稀土元素地球化学特征 ,呈轻稀土富集型 ,出现不明显的Eu负异常及明显的Tb和Er正异常 .成矿流体H、O同位素变化范围小 ,δ18OH2 O =4 4 5‰～ 10 95‰ ,δDH2 O=- 63 0‰～ - 4 2 0‰ ,其成矿物质具统一来源 ,即来自受剪切岩石(志留泥盆系地层及闪长岩体 )Qiaogashan gold deposit is a type of quartz\|vein or altered rocks of fracture zone, which is situated in middle Tianshan brittle\|ductile shear zone.The south part of the deposit is hosted in sheared Silurian\|Devoian stratum, and north part in sheard diorite body.The auriferous quartz\|veins formed in different metallogenetic phase and their wall rock have similar geochemical characteristics of rare earth elements richness, which shows richness in light rare earth element, obscure negative Eu anomaly, and apparent Tb and Er positive anomaly The range of hydrogen and oxygen isotope change of ore\|forming fluid is small, δ\+\{18\}O\-\{H\-2O\}=4 45‰～10 95‰,δD\-\{H\-2O\}=-63 0‰～-42 0‰. Their ore\|forming substances and fluid are homogeneous and have identical origin, that is from sheared rocks (Silurian\|Devonian stratum and diorite body).

关 键 词：金矿床 稀土元素 地球化学特征 成矿物质 

分 类 号：P618.51[天文地球—矿床学] P595[天文地球—地质学]