新疆东部卡拉塔格地区构造影像特征分析

Analysis of Structural Image Characteristics in the Kalataga Area,Eastern Xinjiang

卡拉塔格是新疆东天山地区近年来新发现的铜锌金多金属矿区,找矿潜力较大。本文利用高分辨率的QuickBird卫星遥感数据,通过图像增强处理和影像特征分析,结合卡拉塔格矿区地质勘查成果资料,提取出与成矿作用有关的各级线-环构造。根据线性构造的影像特征分析,划分出三个构造期次:区域性近东西向-北东向、近南北向和北西向。环形影像就其成因类型有火山机构、基底隆起以及褪色蚀变岩体等三种,其中火山机构和蚀变岩体与区内成矿关系密切。最后,通过对区域成矿地质条件、矿化地质特征以及遥感影像解译结果的综合分析,进行了初步的成矿预测,优选出5处找矿远景区。

Kalatage is a newly discovered copper-zinc-gold metal ore field in the East Tianshan Mountains in Xinjiang.It has great potential in prospecting.This study makes image strengthening and characteristic analysis to the high-resolution QuickBird satellite remote sensing data,and combines with the data of geological surveys in the Kalatage mine to extract line-ring structures of every levels associated with mineralization.According to the image characteristics of linear structures,three structural trends are identified：nearly EW-NE,nearly NS and NW direction.There are three genetic types of ring-shaped image：volcanic body,basement uplift and fading rock alteration,among which the volcanic body and fading rock alteration are closely related with mineralization.Finally,a synthetic analysis is performed to the regional geological conditions and geological characteristics of mineralization and the interpretative results of remote sensing images.And a preliminary prediction on mineralization is made,resulting in five preferred prospecting areas.