首页|模糊证据权方法在镇沅(老王寨)地区金矿资源评价中的应用

模糊证据权方法在镇沅(老王寨)地区金矿资源评价中的应用

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
  • 维普
采用模糊证据权方法和GeoDAS GIS技术开展了镇沅(老王寨)及其邻区的金矿资源潜力评价.分别采用GeoDAs GIS软件提供的局部奇异性分析技术、S-A异常分解技术、主成分分析技术、证据权、模糊证据权等技术对相关地球化学元素进行了系统的处理和分析.应用主成分分析方法确定了可能的2种不同成矿类型,并采用主成分得分确定了组合异常点,在此基础上分别采用普通证据权和模糊证据权方法编制了成矿后验概率图,圈定了有利成矿地段.对比普通证据权方法与模糊证据权方法所得结果表明,模糊证据权方法可减小图层离散化造成的有用信息损失,提高预测结果精度.
Application of Fuzzy Weights of Evidence Method in Mineral Resource Assessment for Gold in Zhenyuan District, Yunnan Province, China
The fuzzy weights of evidence method implemented in GeoDAS GIS was applied to delineate targets for exploration of gold mineral deposits in Zhenyuan mineral district, Yunnan Province, southwestern China. According to the mineral de posit model compiled by USGS, the mineral deposit type discovered in the area is determined as mesothermal gold deposit. Together with field observations the mineralization associated elements are determined, which include Au, As, Hg, Ag, Sb, Pb, and Cd. The singularity method and S-A methods provided in GeoDAS GIS were applied to delineate the weak anomalies and mixing anomalies related to gold mineral deposits. Principal component analysis method was utilized to analyze these elements to form two components (PC2 and PC3) which may reflect two different types of mineralization; PC2 dominated by Au-As-Hg-Co-Ni-Cu may be related to mesothermal deposits formed close to the contact of the ultramafic intrusions; whereas the PC3 dominated by Au-As-Hg-Ag-Pb may represent epithermal mineral deposits located in the sedimentary basin away from the ultramafic intrusions. The peaks of scores on these types of composite anomaly maps were delineated and used as training points for utilization of weights of evidence method and fuzzy weights of evidence method, respectively, 16 targeting areas were delineated using fuzzy weights of evidence method and were suggested for further exploration. The detailed comparison of fuzzy weights oi evidence method with the ordinary weights of evidence method shows that the former can produce better results with less loss of useful information during construction of discrete evidential layers.

fuzzy probabilityweights of evidence methodanomaly decompositionsingularityGeoDAS CISmineral resource assessment: hydrothermal gold deposit

成秋明、陈志军、Ali Khaled

展开 >

中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉,430074

加拿大约克大学地球空间科学与工程系,加拿大多伦多,M3J1P3

模糊概率 证据权方法 异常分解 奇异性 GeoDAS GIS技术 矿产资源评价 热液金矿

国家自然科学基金国家自然科学基金国家高技术研究发展计划(863计划)

40525009406380412006AA06Z115

2007

地球科学
中国地质大学

地球科学

CSTPCDCSCD北大核心
影响因子：1.447
ISSN：1000-2383
年,卷(期)：2007.32(2)
  • 54
  • 5