Application of Remote Sensing Alteration Anomaly Extraction with the Method of Composite Algorithm Based on TM/ETM Images
详细信息
- 责任者：Wu Zhichun (Fundamental Science on Radioactive Geology and Exploration Technology Laboratory ; East China Institute of Technology ; Nanchang 330013 ; China) ; Guo Fusheng
- 刊名：Geology and Prospecting
- 出版年：2013
- 卷期：49(3)
- 关键词：蚀变 ; alteration ; 遥感 ; remote sensing ; 甘肃 ; Gansu Province
- 页码：p.511-522
- 图表：illus., 2 tables, 21 refs.
- 分类号：1600
- issnNo：ISSN0495-5331
- isbnNo：CN11-2043/P
摘要
This study is based on extraction of the distribution of alkali metasomatic rocks in the uncovered bedrock area in Longshoushan,Gansu Province, abnormal alteration in a large area of Yushu county, Qinghai Province and abnormal alteration in the vegetation-covering area in the Xiangshan uranium field, Jiangxi Province. The purpose is to validate the effectiveness of the composite algorithm which includes perfect linear extension, removing and restraining interference, band radio, principal component analysis (PCA) and image masking and density segment. Comparing with the alkali metasomatic rocks in its subareas, the alkali metasomatic rock from the Longshoushan of Gansu Province larger than one pixel, 1/2 pixel, and 1/4 pixel have the extracting rates 100%, 94.74%, and 80% respectively. And alkali metasomatic rocks less than 1/4 pixel appear in groups with relatively small spacing. These rocks can be Abstracted by the remote sensing, and the testing area is bigger than scheduled. It is found that the abnormal alteration can be effectively Abstracted if the alkali metasomatic rock is larger than 1/4 pixel. In Yushu county, Qinghai Province, among the 84 mineral deposits or mineral occurrences, 74 objects are in accordance with alternation anomalies, meaning a successful rate of 88.1%. And these objects, from large to small, are iron mine, copper mine, zinc mine, and lead mine. In the polymetallic mines, the mines are overlapped by two or more alteration anomalies. In the Xiangshan uranium field covered by vegetation in Jiangxi Province, the Abstracting result of alteration anomalies is worse than the uncovered, but the alteration is confirmed in the field. The mineral deposits and mineral occurrences in the west are in good agreement with the iron alteration. And it is the same in the north. Also, we analyze the reasons why some mineral deposits and mineral occurrences and the abnormal alteration cannot match well.
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