新疆乌恰地区ETM＋数据蚀变矿物填图与重点成矿区域预测

A STUDY OF THE METHOD FOR EXTRACTIOH OF ALTERATION ANOMALIES FROM THE ETM+ DATA OF THE WUQIA AREA OF THE SINKING PROVINCR

含羟基和含铁矿物异常作为两大类近矿围岩蚀变是遥感间接找矿的重要标志.在地质找矿遥感勘查中,含羟基和含铁矿物分布制图和异常信息提取非常重要.近矿围岩蚀变在某些特定光谱波段可形成蚀变岩石光谱异常,这些特有的光谱特性在ETM+图像中被敏锐地识别到,用于含羟基和含铁矿物异常信息提取.新疆乌恰地区ETM+遥感图像,应用遥感图像处理技术和统计学方法,将各种微弱蚀变信息按级次圈定,进行羟基和含铁矿物异常信息分布的研究.综合地质、地球化学和遥感等信息的"二次开发"研究,优化了找矿信息,在此基础上圈定找矿远景靶区.

The alteration rocks anomaly is the important indicate now if people want to seek the mine depending on the remote sensing image. Therefore, in the geological prospecting remote sensing investigation, the alteration rocks anomaly＇s distributed charting and the unusual information＇s extraction are very important.The alteration rocks anomaly have many differences with normal rocks ,for example, mineral type, structure, color, which causes the difference in the rock reflection spectrum characteristic. So each the alteration rock has special spectrum in some specific band spectrums. The ETM＋ image we may recognize These unique spectral characteristic. In This article the author selects the Wuqia area of Xinjiang province, a ETM＋ remote sensing image, Apply remote sensing imagery technology and statistical method, Selects each kind of weak alteration information according to the level, has carried on the hydroxyl and the ferri mineral unusual inform