J4 ›› 2012, Vol. 42 ›› Issue (3): 887-894.

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Applying Geostatistics to Extract Geochemical Information in East Tianshan

Yin Jiang-ning1, Xiao Ke-yan1, Zou Wei1, Wang Zhong2,Lu Lu1   

  1. 1． Institute of Mineral Resources, Chinese Academy of Geological Science, Beijing100037,China;
    2． Resources and Environment School, Hefei University of Technology, Hefei230009,China
  • Received:2011-08-07 Online:2012-05-26 Published:2012-05-26

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Abstract:

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.

Key words: universal-kriging, variogram, anisotropy, chemical anomaly

CLC Number: 

  • P628.2
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