西秦岭中寨—十里铺地区水系沉积物测量找矿效果

Prospecting Effect of Stream Sediment Survey in Zhongzhai-Shilipu Area of West Qinling Mountains

中寨—十里铺地区处于寨上超大型金矿的西部,成矿条件有利。通过在该区开展1/5万水系沉积物测量工作,对区内17种元素的地球化学特征进行了研究,认为中寨—十里铺地区的地层单元是对成矿有利的地球化学块体。运用数理统计方法,分析了成矿元素的相对丰度和相对变异系数特征,以及元素富集程度,指出多金属成矿的有利部位。通过计算成矿元素在不同地层单元中的找矿潜力指数(K×Cv),评价了各地层单元的成矿潜力。通过对研究区内17种元素的R型聚类分析,研究了元素的相关性特征及其空间分布规律,讨论了各元素在空间上的分布特征和组合关系。根据异常的地球化学特征、地层和断裂,优选出4处成矿远景区。在此基础上,开展异常查证,部署工程揭露,发现了3处金锑矿点,取得了良好的找矿效果。

Zhongzhai-Shilipu area is located in the west of the Zhaishang super-large gold mine area,and its metallogenic conditions are favorable.The 1 ∶50 000 stream sediment survey is carried out in this area.The geochemical characteristics of 17 elements in this area are studied,which showed that the stratigraphic units of Zhongzhai-Shilipu area are the favorable geochemical blocks.Using the method of mathematical statistics,the relative abundance,relative coefficient of variation and enrichment degree of ore-forming elements were analyzed,and the favorable parts of polymetallic mineralization were pointed out.The metallogenic potential of each stratigraphic unit was evaluated by calculating prospecting potential index（k× Cv）of ore-forming elements in different strata.The correlative character and spatial distribution of elements are studied,the spatial distribution characteristics and combination relations are discussed by R cluster analysis of 17 elements from 3 904 samples in the working area.According to the abnormal geochemical characteristics,strata and fault structure,four mineralization prospects are selected.On the basis of carrying out abnormal verification and deploying the project,three Au-Sb ore occurrences were found,and achieved good prospecting effect.