溧阳盆地金山地区土壤地球化学特征及找矿效果  

Geochemical Characteristics of Soil and Their Prospecting Effect in the Jinshan Area of Liyang Basin

作　　者：杨用彪[1] 黄顺生[1] 王丽娟[1] 陈冬[1] 缪柏虎 易善鑫 YANG Yongbiao;HUANG Shunsheng;WANG Lijuan;CHEN Dong;MIU Bohu;YI Shanxin(Geological Survey of Jiangsu Province,Nanjing,Jiangsu 210049)

机构地区：[1]江苏省地质调查研究院,江苏南京210049

出　　处：《地质与勘探》2023年第4期791-802,共12页Geology and Exploration

基　　金：中国地质调查局项目(编号:1212011120855、 DD20190379-11);江苏省自然资源发展专项资金项目(编号:苏财资环[2021]46号)联合资助。

摘　　要：近年来江南古陆北缘陆续取得找矿突破,但其毗邻的溧阳盆地鲜有地质找矿成果报道。通过溧阳盆地矿产地质远景调查,在分析区域成矿地质特征的基础上,对1∶5万水系沉积物测量圈定的金山异常开展了1∶10000土壤地球化学测量。运用多元统计学方法,对Cu、Pb、Zn、Au、Ag、As、Bi、Hg、W、Mo、Sn 11种元素进行地球化学参数统计、聚类分析及因子分析,发现W、Pb等元素的找矿有利信息及其与热液活动相关的多阶段成矿作用。采用不同岩性分区异常下限衬值法圈定W、Pb元素地球化学异常28处,采用多因子叠加法圈定综合异常6处。以Z-03及Z-06综合异常为例,从成矿地质作用与综合异常特征角度进行评价,结果表明综合异常主要受断裂构造、中酸性岩体与灰岩接触带控制;进一步对Z-06综合异常开展槽探及钻探验证,发现了钨工业矿体及铅-锌矿脉,为区域下一步矿产勘查指明了方向。In recent years,prospecting breakthroughs have been accomplished in the northern margin of the Jiangnan ancient land,but few geological prospecting successes have been reported in the nearby Liyang Basin.Through the mineral geological prospecting survey of Liyang Basin,based on the analysis of the regional metallogenic geological features,a 1∶10000 geochemical soil measurement was conducted on the Jinshan anomaly delineated by 1∶50000 stream sediment measurements.Geochemical parameter statistics,cluster analysis,and factor analysis on the 11 elements of Cu,Pb,Zn,Au,Ag,As,Bi,Hg,W,Mo,and Sn were performed using multivariate statistical methods.There is favorable prospecting information of W,Pb and other elements,as well as the influence of their multi-stage mineralization on hydrothermal activities.A total of 28 geochemical anomalies of W and Pb elements were identified by the anomaly lower limit contrast method in different lithological zones,and six comprehensive anomalies were delineated by the multi-factor superposition method.The evaluation was conducted from metallogenic geological process and comprehensive anomaly characteristics,using the Z-03 and Z-06 comprehensive anomalies as examples.It demonstrates that the faults and the contact zone between intermediate-acid rock mass and limestone exert a significant control on the anomalies.Tungsten industrial ore bodies and lead-zinc veins were discovered during additional trenching and drilling verification of the Z-06 comprehensive anomaly,which provide direction for future exploration in the area.

关 键 词：土壤地球化学测量 异常下限衬值法 聚类分析 因子分析 异常评价 金山地区 溧阳盆地 

分 类 号：P632[天文地球—地质矿产勘探]