青海省都兰县金水口地区水系沉积物地球化学异常特征及找矿前景  

Geochemical Anomalies Characteristics of Stream Sediments and Ore-Search Prospect in Jinshuikou Area of Dulan County,Qinghai Province

作　　者：李超 罗先熔 邱炜[2] 王宇慧 赵欣怡 郑超杰 刘攀峰 LI Chao;LUO Xianrong;QIU Wei;WANG Yuhui;ZHAO Xinyi;ZHENG Chaojie;LIU Panfeng(College of Earth Science,Institute of Concealed Mine Prospecting,Guilin University of Technology,Guilin,Guangxi541004,China;Qinghai Institute of Geological Survey,Xining,Qinghai810012,China)

机构地区：[1]桂林理工大学地球科学学院隐伏矿床预测研究所,广西桂林541004 [2]青海省地质调查院,青海西宁810012

出　　处：《现代地质》2021年第5期1397-1410,共14页Geoscience

基　　金：国家重点研发计划项目“深部铀成矿信息识别技术研究”(2017YFC0602604HT02);国家重点研发计划项目“穿透性地球化学勘查技术”(2016YFC0600603);青海省科学技术厅应用基础研究计划项目(2018-ZJ-779)。

摘　　要：为优选青海省都兰县金水口找矿靶区,在了解该区地质特征的基础上开展了150000水系沉积物测量工作。基于原始测量数据,运用区域浓集系数(RCC)等特征参数对Au、As、Sb、Bi、Hg、Co、Cr、Ni、Zn共9种微量元素含量进行统计分析,推断出Zn、Au元素具有较大的成矿潜力。利用统计学软件SPSS25对9种元素进行R型系统聚类分析、相关分析及R型因子分析,共划分F1(Co-Cr-Ni)、F2(Au-Bi-Zn)、F3(As-Sb)、F4(Hg)4组成矿元素组合。采用衬度异常法求出各元素及元素组合异常下限,运用Surfer15软件将元素及元素组合衬度数据编制成异常图,结合区内元素异常特征及成矿地质条件共圈定5个预测找矿靶区。对Ⅰ-1号靶区1号多金属矿化体进行异常查证,拣块样化学分析显示锌、全铁含量均达最低工业品位。对Ⅰ-2号靶区2、3号多金属矿化体进行探槽工程揭露,经取样分析显示部分锰、锌含量已达边界品位,全铁含量接近边界品位,金具备一定成矿潜力,表明金水口地区有较大的锌铁金锰成矿潜力。To optimize the prospecting target area in Jinshuikou,Dulan County,Qinghai Province,a 150,000 stream sediment survey was carried out based on understanding the geological characteristics of the area.Based on the original measured data,the contents of nine trace elements including Au,As,Sb,Bi,Hg,Co,Cr,Ni,and Zn are statistically analyzed by using the regional concentration coefficient(RCC)and other characteristics parameters.It is concluded that Zn and Au have great metallogenic potential.The R-type cluster analysis,correlation analysis,and R-type factor analysis of nine elements were carried out by using statistical software SPSS25.Four ore element combinations were divided,including F1(Co-Cr-Ni),F2(Au-Bi-Zn),F3(As-Sb),and F4(Hg).The contrast anomaly method is used to calculate the anomaly lower limit of each element and element combination.Surfer15 software is used to compile the element and element combination contrast data into an anomaly map.Combined with the characteristics of element anomaly and metallogenic geological conditions,five prospecting targets are delineated.The abnormality of the No.1 polymetallic minerali-zation in the No.1-1 target area was verified,and the chemical analysis of the picked samples showed that the contents of zinc and total iron reached the lowest industrial grade.The exploration trench project was carried out on the No.2 and No.3 polymetallic mineralization bodies in the No.1-2 target area.After sampling and analysis,it was shown that the contents of some manganese and zinc had reached the boundary grade,and the total iron content was close to the boundary grade,and gold had a certain degree of metallogenic potential indicates that the Jinshuikou area has a large metallogenic potential of zinc,iron,gold and manganese.

关 键 词：水系沉积物 地球化学特征 衬度异常法 找矿前景 青海都兰 

分 类 号：P632[天文地球—地质矿产勘探]