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《Geological Science and Technology Information》 2011-01
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Delineation of 1∶50000 Geochemical Anomalies Based on the Method of Unit-Wise Adjustment of Outliers in Gobigeomorphologic Landscape:An Example of an Arid Area from Northwestern China

SHI Wen-jie1,WEI Jun-hao1,WANG Qi2,ZHANG De-cai3,LIU Guo-chun2,YU Hai-tao2, CHEN Chong1(1.Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,Chin a;2.The Chifeng Institute of Geological and Mineral Exploration of the Inner Mongolia,Chifeng In ner Mongolia 024000,China; 3.The Second Institute of Geological and Mineral Exploration of the Inner Mongolia,Bayannur Inner Mongolia 015000,China)  
The arid Gobi is a particular geomorphologic landscape of the northwes tern China.The surface soil in this region is composed of wind dust,loess shell, plaster layer and rock chips.Taking an arid area from northwestern China as an e xample,this paper discusses the method of unit-wise adjustment of outlier geoche mical data and its application effects.This method based on non-conventional sta tistics makes the outliers of different unit-wise on the same level through some rules,and resultantly all geochemical anomalies delineated by fractal method us ing the corrected data can be identified efficiently.The anomalies,delineated b y the method of unit-wise adjustment of outliers and fractal method,are well con sistent with the known geological setting and mineralization.Furthermore,the ide ntification of the weak anomalies and decomposition of anomalies in high backgro und area using this method,is better than the results of simple normalization.
【Fund】: 内蒙古自治区国土资源厅项目“内蒙古额济纳旗基东等四幅1∶5万区域矿产地质调查”(NMKD2008-32)
【CateGory Index】: P632
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