甘肃玛曲大水金矿构造叠加晕特征研究  

Characteristics of Structural Superimposed Halos of the Dashui Gold Deposit in Maqu County,Gansu Province,China

作　　者：张涛[1] 曹燕山 张德会[1] 李泳泉[1] 刘家军[1] 史文全 夏发来 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]河北省区域地质矿产调查研究所,河北廊坊065000 [3]甘肃地矿局第三地质矿产勘查院,兰州730050

出　　处：《矿物岩石地球化学通报》2017年第2期279-288,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国土资源部公益性行业科研专项基金项目(201411024);中国地质调查局项目(2015020902029);中央高校基本科研业务费专项

摘　　要：为探讨甘肃大水金矿深部成矿潜力,在分析矿区成矿地质条件及矿床地质特征的基础上,对大水金矿Au2主矿体开展了构造叠加晕研究。地球化学统计分析表明,大水金矿矿床元素组合为Au、Ag、Hg、As、Sb、W,矿区Au、Sb、Ag、As、Hg、U等元素背景含量较高。矿体轴向特征研究显示,大水金矿床Au2主矿体原生晕轴向分带具有"前、尾晕共存"或"反分带"特征,表明大水金矿具有多期多阶段叠加成矿-成晕的特征。在矿体上部(标高3800m),前、尾晕形成叠加或共存,指示上部矿体已剥蚀;而在矿体尾部(标高3500m),Hg、Te、As、Sb等前缘晕元素又发育内、中带强异常,形成了前、尾晕叠加或共存,指示深部找矿前景较好。In order to explore the potential of mineral resources in depth of the Dashui gold deposit in Gansu Province, based on analyzing the metallogenic geological conditions and the geological characteristics of the deposit, a research on Structural Superimposed Halos of the Au2 orebody has been carried out in this paper. Geochemical statistical analysis shows that there is an element association of Au, Ag, Hg, As, Sb and W in the Dashui gold deposit, with relative high background contents of Au, Sb, Ag, As, Hg, U. The axial zoning of primary halo of the Au2 orebody in the Dashui gold deposit is characterized with the coexistence of the front and tail halos, or the zoning in opposite direction, indicating that the gold deposit has features of muhiphase and multi-stage superimposed mineralization and associated halos. In the upper part of the Au2 orebody（ about 3800 m in elevation） , the superposition or coexistence of the front and tail halos in the de- posit indicates that the upper part of the orebody was denuded. However, in the bottom part of the Au2 orebody（ about 3500 m in elevation） , strong anomalies of the front halo elements including Hg, Te, As, and Sb are developed, meaning the superposition or coexistence of the front and tail halos. This may imply that there could be a good exploration potential in depth below the Au2 orebody.

关 键 词：大水金矿 构造叠加晕 盲矿预测 主成分分析 甘肃 

分 类 号：P618.51[天文地球—矿床学]