Volume 36 Issue 2
Mar.  2011
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HUANG Jing-ning, ZHAO Peng-da, 2011. Extraction and Assessment of Cu-Au Anomalies of the East Tianshan Ore-Forming Belt, Northwestern China. Earth Science, 36(2): 317-326. doi: 10.3799/dqkx.2011.033
Citation: HUANG Jing-ning, ZHAO Peng-da, 2011. Extraction and Assessment of Cu-Au Anomalies of the East Tianshan Ore-Forming Belt, Northwestern China. Earth Science, 36(2): 317-326. doi: 10.3799/dqkx.2011.033
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Extraction and Assessment of Cu-Au Anomalies of the East Tianshan Ore-Forming Belt, Northwestern China

doi: 10.3799/dqkx.2011.033
  • 1.

    The Geological Museum of China, Beijing 100034, China

  • 2.

    Faculty of Earth & Mineral Resource, China University of Geosciences, Beijing 100083, China

  • Received Date: 2010-10-22
  • Publish Date: 2011-03-01
    Abstract
  • The east Tianshan ore-belt is one of the most important ore concentrated districts of Cu-Au in China. Long and complicated geological evolution created a complex geological background, multi-periods and diversity of mineralization. In this study, stream sediment survey data of Cu-Au are used for spatial distribution analysis, and then Geostatistical method and Spectrum-Area (S-A) method are implemented to obtain ore-forming information at different scale. The research results are as follows: (1) the modeling semivirograms show the max range of Cu and Au are 80 km and 47 km, the direction of max range is along the trend of regional deep faults, which are the major factors controlling the distribution of Cu, Au concentration. Cu concentration exhibits more strong structure character than Au in region. (2) Both low pass filtering in S-A and universal Kringing can obtain the similar ore forming information which reflect the regularity of enrichment of ore-forming elements caused by regional mineralization. (3) Multi-fractal filtering can effectively decompose the concentration data from stream sediment survey in complicated geological setting into different hierarchy, including local anomalies and regional anomalies. Different anomaly filters defined in ln(Spectrum)-ln(Area) plot can be constructed to obtain Cu and Au anomalies at different scale. The local Cu anomalies obtained by S-A method are spatially associated with known Cu deposits, which reveal some conceal ore-forming information in low background. The local anomalies of Au in pinch-and-swell and oriented in North-East trend obtained by S-A method may imply that the gold mineralization is controlled by sub-fault system in NE trend.

     

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