遥感构造蚀变异常信息提取及找矿预测——以老挝为例

遥感地质异常信息提取是遥感地质学的重要研究内容之一.以老挝为例,对研究区ETM+遥感图像采用几何纠正、图像镶嵌、彩色合成、空间变换、图像增强等技术手段,提取地质构造信息；利用掩模技术去除干扰信息,采用主成分分析和阈值分割技术进行铁染和羟基蚀变异常信息提取；结合区域地质、地球物理、地球化学等多元地学信息综合分析,开展研究区遥感找矿预测,圈定了5处遥感找矿远景区.研究成果为加快老挝地质找矿工作提供了基础数据和决策依据.

Remote Sensing Structural Alteration Information Extraction and Ore Prognosis: A Case Study of Laos

The extraction of remote sensing geological anomaly information is one of the important research methods in GARS.In this paper,taking Laos as an example and using such means as geometric rectification,image mosaicking,color composite,space transformation and image enhancement processing to the ETM+ image in the study area,the authors extracted the geological structural information.The interference information was removed by mask technique,and the iron staining and hydroxyl alteration information was extracted by using principal component analysis and threshold segmentation techniques.Five perspective areas for mineral exploration were delineated on the basis of a synthetic analysis of the multi-geoscience information.The results can provide a reference and effective means for accelerating the geological prospecting work in Laos.