Application of Background Corretion Based on the MAPGIS Digital Elevation Model to the Tongshanling-Xianglinpu Area in Hunan Province
详细信息
- 责任者：Ou Zhide (China University of Geosciences ; Faculty of Earth Sciences ; Wuhan 430074 ; China) ; Li Fanglin
- 刊名：Geology and Prospecting
- 出版年：2013
- 卷期：49(4)
- 关键词：数字高程模型 ; digital elevation models ; 地球化学背景 ; geochemical background ; 湖南 ; Hunan Province
- 页码：p.703-712
- 图表：illus., 1 table, 20 refs.
- 分类号：1500
- issnNo：ISSN0495-5331
- isbnNo：CN11-2043/P
摘要
This paper extracts the geochemical anomaly information in the Tongshanling-Xianglinpu area, Hunan province utilizing the 1∶ 200, 000 stream sediment data with the method of background correction based on the Mapgis digital elevation model. The background variation trends of W and Sn elements are simulated by the statistical function of pixel neighbourhood in the Mapgis elevation base management system. And the element concentrations are corrected by the background model, and then the residual (the values of mineralized superposition) are used to determine the geochemical anomalies. By comparing the window size, we find that the bigger the window is, the greater area of anomalies in high background is, but the smaller area of anomalies in low background is. Therefore, when using this method, we need to test different window sizes to pick out the most suitable one. After background correction, the non-mineralized anomalies caused by the high background of W and Sn are restrained. The large anomalies delineated by the traditional methods are broken up into several strong anomalies. The spatial distribution regularities are much better, and they have three level concentration zones of three levels. Some new anomalies are found in the low background, such as W’-7,8,9,13,14,15,21,22,30 and Sn’-1,7,11,13,21. And some anomalies are related to the mineral occurrences and magmatic bodies after correction.