甘肃滴水山金矿床原生晕特征及深部成矿预测  

Primary Halos Characteristics and Prediction for Deep Mineralization in Dishuishan Gold Deposit,Gansu Province

作　　者：杨永春[1,2] 刘家军[1] 王学银 王作刚 陈杰 

机构地区：[1]地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京100083 [2]甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉735000

出　　处：《黄金科学技术》2015年第1期17-23,共7页Gold Science and Technology

基　　金：中国地质调查局地质调查工作项目"西秦岭阳山-寨上大型-超大型金矿床成矿地球动力学背景;过程与定量评价"(编号:1212011220924)资助

摘　　要：滴水山金矿床是一个主要赋存于滨海—浅海相中酸性火山碎屑岩中,与脆—韧性剪切带有关的蚀变岩型金矿床。在野外地质工作的基础上,对Au2号矿体不同勘探线钻孔中所采样品进行微量元素分析,并利用地质和数学分析方法,对微量元素的空间分布特征、原生晕特征及元素组合特征进行了分析。结果表明:根据格里戈良分带指数法,141号勘探线原生晕轴向分带序列为(Pb-As)-Au-Cu-Zn-Bi-Hg-Sb-Ag-Mo,175号勘探线分带序列为(Hg-As-Au-Sb-Pb-Cu)-Zn-Mo-Ag-Bi,存在前缘晕、近矿晕、尾晕元素重叠的现象;通过相关分析、聚类分析和因子分析,认为Au2号矿体中与Au关系较密切的元素为Ag,其次为As和Sb,并确定了Au元素所在的F1主因子元素组合Sb-As-Ag-Cu-Au-(Pb-Zn)为成矿最有利的元素组合。根据元素分布特征,对深部成矿进行了预测,认为Au2号矿体深部仍有较好的成矿前景。Dishuishan gold deposit,related to ductile-brittle shear zone of altered rock-host,is primarily occurred in littoral facies-neritic phase acidic volcanic clastic rock.On the basis of field geological work,the paper analyzes the trace elements of the samples of the drill hole in different geologic section,which located in Au2 orebody,with using geological and mathematical analysis methods,the paper carries through the analysis on the spatial distribution characteristics,the primary halo feature and the elemental association characterisitics of trace elements.The results showed that：On the basis of Grigoryan＇s zonation indexes,the primary halo axial zoning sequence from the top to the deep part in No.141 and 175 geologic section are（Pb-As）-Au-Cu-Zn-Bi-Hg-Sb-Ag-Mo an d（Hg-As-Au-Sb-Pb-Cu）-Zn-Mo-Ag-Bi respectively,which exists the mutual superposition of the front halo elements,proximal elements and tail halo elements;The correlation analysis,cluster analysis and factor analysis reveal that Au is closely related to Ag,and followed by the As,Sb in Au2 orebody,and determine the F1 main factors of Au in the Au2 orebody is Sb-As-Ag-Cu-Au-（Pb-Zn）,which is the most favorable combination of elements for mineralization.According to the space distribution characteristics of each element,we consider that the mineralization is prospective in the deep portion of the Au2 orebody.

关 键 词：数学地质 原生晕 成矿预测 滴水山金矿 甘肃省 

分 类 号：P618.51[天文地球—矿床学]