| 基岩裸露区蚀变岩遥感信息的提取方法 |
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| 引用本文： | 张玉君,杨建民.基岩裸露区蚀变岩遥感信息的提取方法[J].国土资源遥感,1998,9(2):46-53. |
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| 作者姓名： | 张玉君 杨建民 |
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| 作者单位： | [1]国土资源部航空物探遥感中心 [2]中国地质科学院帮床地质研究所 |
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| 摘 要： | 笔者利用与金属矿化相关的蚀变岩的TM多波段图像像元亮度值曲线的双峰特性(TM3和TM5为高值),以柳沟峡地区为样区,进行了提取蚀变岩遥感信息的方法研究,改进了Crosta信息提取方法,认为用TM1+TM2、TM4/TM3、TM5、TM7组合进行主分量分析所获得的蚀变岩遥感异常图效果最佳。将该方法用于北祁连山西段,疏勒河以东9000km2区域内蚀变岩遥感信息提取,其结果是：在103处已知矿产地中的86处有蚀变岩遥感异常信息显示,符合率达83.5%,进而预测了找矿靶区115处。
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| 关 键 词： | 蚀变岩遥感信息 蚀变岩遥感异常 主分量分析 改进型Crosta法 |
| 收稿时间： | 1998-04-20 |
| 修稿时间： | 1998-06-11 |
THE METHOD OF AbstractING REMOTE SENSINGINFORMATION OF ALTERATED ROCKS INTHE UNCOVERED BEDROCKS AREA |
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| Institution: | 1. AGRS, Ministry of Land and Resources, Beijing 100083;
2. Institute of Mineral Deposits, Chinese Academy of Geological Scinces, Beijing 100037 |
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| Abstract: | he in-situ sampling and the on-image sampling have confirmed that in Liugouxia area the altered rocks, being closely related to metallic mineralization, are characterized by the double peaks on the reflective spectra curves (high reflection in TM3 and TM5 bands). This provides the prerequisite for abstracting the information of the alteration rocks from the remote sensing image. This paper, by studying the method of abstracting the alterated rocks information, demostrates that the method of PCA (using TM1+TM2, TM4/TM3, TM5,TM7) is the best for the information abstraction. This method can be called modified Crosta method. Among the 103 deposits located in the 9 000 square kilometers area, there are 86 deposits that have the corresponding alteration anomalies on the anomaly image is obtained by the modified Crosta method. The coincidence coefficient is as high as 83.5%. Another 115 new targets were predicted according to this anomaly image and rock types as well as structrural conditions. |
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| Keywords: | Remote sensing information of alterated rocks Remote sensing anomaly information of alterted rocks Principle component analysis Modified Crosta method |
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