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| A STUDY OF GEOCHEMICAL EXPLORATION SPATIAL CLUSTER IDENTIFICATON BASED ON LOCAL SPATIAL AUTOCORRELATION |
| Nguyen Tien-thanh1,2, LIU Xiu-guo1, REN Ze1 |
1. Faculty of International Education, China University of Geosciences, Wuhan 430074, China;
2. Faculty of Surveying and Mapping Ha Noi University of Mining and Geology, Ha Noi 130510, Viet Nam |
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Abstract Using local Moran's and indexes, the authors studied spatial cluster of 1482 stream sediment samples in a specific area of 8130 km2 on the scale of 1:200000. The comparison of the anomaly range computed by robust statistics with that computed by local spatial autocorrelation shows that local Moran's index can well detect relatively weak spatial cluster and small areas while local index is suitable for spatial cluster detection in a strong degree of spatial cluster and large areas. The degree and area of geochemical spatial cluster by using these approaches accord with the objective reality and are in good conformity with known deposits (ore spots).
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Received: 23 April 2013
Published: 10 April 2014
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