The visualization of iteration processing of geochemical exploration data and an analysis of the result
GAO Yan-Fang1, LI Jun-Ying2, CHEN Jun-Wei3, ZHANG Yun-Ling4, WANG Wen-Jun5
1. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China;
2. No. 11 Geological Party, Hebei Bureau of Geology and Mineral Resources, Xingtai 054000, China;
3. Hebei Institute of Geophysical Exploration, Langfang 065000, China;
4. Hebei Institute of Geology and Surveying, Langfang 065000, China;
5. The Fourth Institute of Geological Exploration, Henan Bureau of Geology and Mineral Development, Zhengzhou 450001, China
To get accurate background value and anomaly threshold, it is necessary to iterate abnormally distributed geochemical data for deleting outliers in geochemistry. To analyze deeply the complex iteration procedure, actual data and "outliers check" the authors used iteration procedure to detect the effect of different parameters and reliability of logarithm transformation. Some conclusions have been reached: According to the goal and 3σrule of normal distribution, in xi±kSi,k=3 is suitable. The higher anomaly threshold of logarithm transformation is not correct and the true value of logarithm standard deviation is not in accord with the standard deviation of the true value, so the the threshold is equal to the sum of geometric mean and standard deviation of the true value.
高艳芳, 李俊英, 陈军威, 张玉领, 王文君. 地球化学勘查数据迭代处理的可视化及结果分析[J]. 物探与化探, 2016, 40(5): 1021-1025.
GAO Yan-Fang, LI Jun-Ying, CHEN Jun-Wei, ZHANG Yun-Ling, WANG Wen-Jun. The visualization of iteration processing of geochemical exploration data and an analysis of the result. Geophysical and Geochemical Exploration, 2016, 40(5): 1021-1025.
