河台韧性剪切带金矿床微量元素稀土元素地球化学特征  

Geochemical Characteristics of Trace Elements at Depths of Hetai Ductile Shear Zone Gold Deposit

作　　者：翟伟[1] 李兆麟[1] 黄栋林[2] 文拥军[1] 全亚荣[1] 

机构地区：[1]中山大学地球科学系 [2]广东高要河台金矿,广东高要526100

出　　处：《中山大学学报（自然科学版）》2003年第2期102-106,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(49873018);广东省自然科学基金资助项目(001255)

摘　　要：河台金矿床赋存于河台韧性剪切带中,矿体严格受剪切带控制,矿石类型以糜棱岩型矿石为主,并有少量石英脉型矿石.矿床以富集Au,Ag,Se,S,As,Bi,Cu,Sb的元素组合为特征,Au/Ag比值在2～10,同时W,Sn,U,Pb也有一定程度的富集.亲铁元素Sc,Ti,V,Cr,Mn,Co,Ni出现亏损;大离子亲石元素Rb,Cs发生富集,而Sr、Ba、Y等出现亏损,同时REE元素也出现亏损,稀土元素组成以轻稀土富集为特征,∑LREE/∑HREE 为5.1～11.53,∑REE在54.49×10-6～137.45×10-6之间,出现明显的Eu亏损,δEu在0.52～0.66之间.根据特征富集元素组合及元素含量向深部的变化趋势,推测矿床向深部的延伸仍具有很好的工业前景.Hetai gold deposit is hosted in ductile shear zones. The ore body is mainly composed of gold-bearing mylo-nites, and minor gold-bearing quartz veins. The deposit is characterized by the enrichment composition of Au, Ag, Se, S, Bi, Cu, Sb with a Au/Ag ratio of 2 ~ 3, less enrichment in W, Sn, U, and Pb. The deposit is also enriched in LILEs Kb and Cs, and depleted in LILEs Y, Sr and Ba, and siderophile elements Sc, Ti, V, Mn, Co, Ni, and REE. The deposit has light-enriched and obviously Eu-depleted pattern with a ratio of 5.1 ~ 11.53 between LREE and HREE. The contention trend of enrichment element composition in depths indicates a good industrial prospect of ore-body extension towards depth.

关 键 词：河台韧性剪切带 金矿床 微量元素 稀土元素 地球化学特征 矿床地质 

分 类 号：P618.51[天文地球—矿床学]