基于分形的遥感蚀变提取及成矿预测:以青海野马泉地区为例

分形是局部和整体以某种方式相似的形体。蚀变作为一种地学特征,作为遥感异常反映在遥感图像上,其像元亮度-面积模式亦符合一定的分形理论。可以利用分形理论的求和法进行遥感蚀变异常的提取和分级,并且此方法可以弥补门限法和灰度直方图目视方法确定突变点方法的不足。本文以青海野马泉地区的矽卡岩型铁铜多金属矿床为研究区,利用ETM数据提取研究区的铁染蚀变信息,并分析与区域成矿的相关性。

Remote sensing alteration extraction and metallogenic prediction based on fractal: Ye ma-quan area in Qinghai taken as example

Fractal is locally similar to the whole in some way.Alteration is a feature of geology,as the remote sensing anomaly in remote sensing image,the pixel brightness and area mode also meet certain fractal theory.Fractal theory can be used for remote sensing alteration anomaly extraction and classification,this method can compensate for the threshold method and the method of gray histogram of visual to determine the inadequacy of method of point mutation.This paper takes Yemaquan area of skarn type copper polymetallic deposit in Qinghai as the study area,drawing iron stain alteration information via ETM data of the research area,analysis the correlation between alteration information and regional metallogenetic.