ETM 遥感数据在白音吉日嘎拉-阿尔萨拉一带1∶5万地质调查中的应用

摘要

The study region is located at the Baiyinjirigala-Arsala area in Inner Mongolia autonomous region, based on the ETM date primary combined with remote sensing technique,the regional main line and ring structure were interpreted by the image difference,and then spectrum characteristics of the alteration mineral were analyzed as well.Meanwhile,through the determined mathematical model by abnormal lower limit value,the remote sensing alteration anomaly information was extracted quantitatively employing principal component analysis and ratio method.Comprehensive analysis of spatial correlation between geology,geophysical prospecting,chemical prospecting and remote sensing alteration anomaly information for further detecting abnormity is vital importance for improving the effectiveness of early geological reconnaissance,geological prospecting and science research in the study area.What’s more,it is expected this analysis method can serve as guiding function for remote sensing technology in regional investigations.%选择内蒙古阿旗白音吉日嘎拉—阿尔萨拉一带为研究区，以遥感技术为主要手段，ETM 数据为基础，通过影像差异来对照解译区域上的主要线、环构造，分析研究区内蚀变矿物波谱特征，利用主成分分析和比值法，通过异常下限值确定数学模型来定量提取遥感蚀变异常信息。综合分析地质、物探、化探、航磁等与遥感蚀变信息异常空间的关联性，进一步筛选异常，提高研究区的前期地质踏勘和地质找矿效果，真正发挥遥感技术在区调工作中的先行指导作用。