Identifying geochemical anomalies using a new method of Yang Chizhong-spatial scan statistic

Liu Q.; Yang J.; Mao X.Liu Z.Deng M.Chen Y.Liu W.

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Identifying geochemical anomalies using a new method of Yang Chizhong-spatial scan statistic

机译：Identifying geochemical anomalies using a new method of Yang Chizhong-spatial scan statistic

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? 2023 Elsevier LtdIdentifying anomalies from geochemical data by modeling of the background and statistical evaluation of anomalies is a major concern in geochemical exploration. This study developed a novel method (namely YangScan) for extracting geochemical anomalies by using Yang Chizhong filtering and a spatial scan statistic. The Yang Chizhong filtering, a progressive filtering method on the principle of weighted moving mean of binomial coefficient, was used to construct the background whose concavity and convexity are consistent with the original data. After removing the background from the original data, a spatial scan statistic based on multidirectional optimization was developed to identify arbitrary shaped and statistically significant anomalies from the residuals. YangScan was tested on both simulated datasets and a stream sediment geochemical dataset collected in the Northwestern Jiaodong Peninsula, Eastern China. The experimental results evaluated by geology consistency, recall, and weights of evidence contrast show that YangScan outperforms the two comparision methods (i.e., the trend surface analysis method and k-nearest neighbor anomaly detector) in identifying weak and irregularly-shaped geochemical anomalies. The distribution of geochemical anomalies linked to Au mineralization identified by YangScan is highly correlated with the trending of known Au deposits and ore-controlling structures. Therefore, YangScan is a powerful tool for identifying geochemical anomalies and can provide a useful reference for mineral exploration.

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《Computers & geosciences》 |2023年第9期|1.1-1.19|共19页
作者
Liu Q.; Yang J.; Mao X.Liu Z.Deng M.Chen Y.Liu W.;
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Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Central South University Ministry of Education||Department of Geo-informatics Central South University||Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Detection;

Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Central South University Ministry of EducationKey Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Central South University Ministry of EducationKey Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Central South University Ministry of Education||Department of Geo-informatics Central South University;

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正文语种英语
中图分类计算机的应用;天文学、地球科学;
关键词
Geochemical exploration; Hydrothermal Au deposits; Significance test; Spatial scan statistic; Yang chizhong filtering;

Identifying geochemical anomalies using a new method of Yang Chizhong-spatial scan statistic

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