地质统计学在东天山化探信息提取中的应用

地球化学场和地球物理场都具有一定的空间结构性和空间自相关性，而揭示这种空间相关性的有力工具是变差函数。利用变差函数对东天山的1∶20万区域地球化学数据Cu和Au进行了结构分析。结果表明：两元素在东西方向有着较好的稳定性和连续性，南北方向有较大的变化性并具有一定的线性漂移，总体呈现带状异常，与东天山EW方向大断裂具有很好的一致性。利用泛克里格法对Cu、Au进行了异常信息的提取和评价，泛克里格法提取的剩余异常不仅能突出高异常区，也较清晰地反映了部分低缓异常带，为研究区域化探异常分布特征提供了丰富的信息。

Applying Geostatistics to Extract Geochemical Information in East Tianshan

Geochemical and geophysical surveying data have some features of spatial structure and autocorrelation,which can be described by variogram.The authors analyze the statistical characteristics of the regional chemical elements of Cu and Au on the scale of 1∶200000 in east Tianshan.The results show that the two elements have better stability and continuality in EW direction while some stronger variability in SN direction.This regional anisotropy and linear trend are fairly consistency with the large regional EW faults of east Tianshan.The anomalies of Cu and Au were extracted and appraised.The residual anomalies extracted by universal-kriging not only highlight anomalous areas with high values,but also clearly reflect the anomalous areas with low and weak values.Therefore,universal-kriging can acquire more abnormal chemical information.