| 基于SRTM的重砂矿化信息提取方法——以中甸地区为例 |
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| 关键词:SRTM heavy placer mineral GIS fuzzy logic Zhongdian area |
| 基金项目:国家科技攻关计划课题(编号:2001BA609A-05,2003BA612A-05); 国家973课题(编号:2002CB412607); 国家科技支撑计划课题(编号:2006BAB01A07,2006BAB01B05) |
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| The Extraction of Mineralization Anomalies from Heavy Placer Mineral Data Based on SRTM: A Case Study of the Zhongdian Area |
| The 3 arc seconds SRTM data,i.e.,the DEM data covering whole China,are useful to the prognosis of mineral resources.This paper deals with the acquisition means,accuracy,data type and preprocessing technique.The accuracy of SRTM can satisfy the requirement of metallogenic prognosis on the scales from 1:50,000 to 1:1,000,000.Based on the D8 algorithm,the catchments in Zhongdian area can be extracted in GIS,and the result is similar to that obtained from the drawn geographical map.The numeralization of the heavy placer mineral map was carried out for each catchment.As for the prognosis of porphyry copper deposits in Zhongdian area,the heavy placer minerals which contain such elements as Cu,Au,Ag,Pb and Zn can show mineralization directly.The more complex the mineral assemblage and the higher the content,the more probable the existence of mineralization,and this can be used as the criterion of data integration.According to the criterion,the fuzzy logic membership value was given and the fuzzy inference network was designed on GIS software.The calculation results are in accord with the distribution of the known deposits and show some new significant catchments.Differing from the Hongshan skarn copper deposit,the Pulang and Xuejiping porphyry copper deposits are situated in intermediate fuzzy logic probability(0.5～0.8),which might be controlled by grade,mineral assemblage,and denudation.The catchments with intermediate fuzzy logic probability(0.5～0.8)are important to search for porphyry copper deposits.Some new porphyry copper ore spots were discovered in Pushang and Disuga during the field work. |
| CAO Dian-hua,WANG An-jian,GUAN Hua,WANG Gao-shang.2008.The Extraction of Mineralization Anomalies from Heavy Placer Mineral Data Based on SRTM: A Case Study of the Zhongdian Area[J].Acta Geoscientica Sinica,29(1):121-126. |
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