甘肃迭部县尖尼-洛大地区水系沉积物地球化学特征及找矿靶区预测

Geochemical characteristics of stream sedimentary survey and prospecting target prediction in the Jianni-Luoda area,Diebu County,Gansu

利用MapGIS、SPSS等软件对甘肃迭部县尖尼—洛大地区1∶5万水系沉积物地球化学数据进行元素R聚类分析和因子分析,提取8个具有代表性的因子,绘制出地球化学分区图及因子得分等值线图,并讨论各地球化学分区与工作区地质背景的对应关系;采用原始数据取对数剔除异点使元素含量呈正态分布,以高出背景值1.65倍标准差为异常下限值,作出各元素异常图和综合异常图;在GIS支持下,结合区内成矿地质条件,对组合异常区进行综合分析,圈定了黑拉金铁、查哇金等找矿靶区。

By MapGIS,SPSS and other softwares,R-type cluster analysis and factor analysis are carried out on the geochemical data of 1∶50000 stream sedimentary survey in Jianni-Luoda area,Diebu County,Gansu Province,and 8 representative factors are extracted.The geochemical zonation map and factor score contour map are drawn,and the corresponding relationship between each geochemical zonation and other geological background is discussed.The logarithm of the original data is used to eliminate the different points,so that the element content is normally distributed.1.65 times the standard deviation higher than the background value is used as the lower limit value of anomaly,and each element anomaly map and comprehensive anomaly map are produced.Under the support of GIS,combined with the ore-forming geological condition in the area,the combination anomaly area is comprehensively analyzed.Heila gold-iron prospecting target area,Chawha gold prospecting target area and other prospecting target area are delineated.