Abstract:

Geo-anomalies are significant foundation of mineral prospectivity,appropriate methods of extraction of geo-anomalies and a decisionmodel can be applied to get accurate and reliable geo-anomalies from various data.In the study,evidential belief model is used to evaluate the spatial information of lithological, belts, alteration of remote sensing and geochemical elements in the Cu-Pb-Zn mineral area of Yushigou-Chuancigou,Qilianshan:The indicators(belief,disbelief,uncertainty)of evidences are calculated according to the space relationship between distribution of mineral depositsand evidences,and methods such as fractal and PCA are adopted to eliminate the fake anomalies,then cmineralization beliefs are calculated based on Dempster rules.The result shows that 96% deposits located in the site of the peak of belief, and the distribution of geo-anomaly is consistent to the reality. The model weakens the impact by conditional independence when integrated,and conclusively increases the accuracy and efficiency of extraction and integration of geo-anomalies.

Key words: evidential belief, geo-anomaly, mineral evaluation and prediction, Cu-Pb-Zn mineral area of Yushigou-Chuancigou,Qilianshan