ETM+图像锰矿化蚀变信息提取与找矿预测

锰矿床浅层常含大量羟基、三价铁离子的现象使锰矿化异常在一定程度上可由羟基、铁染异常表征.由此提出采用波段比值、阈值分割、主成分分析等方法对ETM+遥感图像进行羟基异常和铁染异常蚀变信息提取,并利用GIS、结合已知矿点对提取的蚀变信息进行综合分析.以桂西-滇东南地区的锰矿为例,经过锰矿化蚀变信息提取与综合分析,验证了锰矿...

The Extraction of the Manganese Mineralization Alteration Information from the ETM+ Image and Ore Prognosis

 As the surface of the manganese ore deposit always contains a large amount of hydroxyl and ferric ions，manganese mineralization anomaly can be characterized to some extent by the hydroxyl and iron anomaly. The authors therefore proposed the adoption of such methods as band ratio，threshold segmentation and principal component analysis to extract the hydroxyl and iron abnormal alteration information from ETM+ remote sensing images，and analyzed the extracted abnormal alteration information in combination with data from known ore spots by using GIS. With manganese deposits in western Guangxi and southeastern Yunnan as examples and through the manganese mineralization alteration information extraction and comprehensive analysis，the authors verified the relationship between manganese mineralization and remote sensing alteration information as well as the effectiveness of the methods used in this paper and, on such a basis, put forward new ideas and methods for the prediction and evaluation of manganese ore deposits. Using extracted alteration information，the authors divided the study area into three kinds of favorable ore-forming zones on the basis of ore-forming favorable degree and delineated six potential districts for ore-prospecting in this area.