西藏多龙铜多金属矿集区构造及蚀变遥感信息提取

摘 要]本文选取RADARSAT2 四极化雷达数据及ASTER 多光谱遥感数据,通过对两者的数据处理及联合分析,提取了西藏多龙矿集区的构造格架和蚀变信息。理清区域环形构造为一个大的半圆形环状构造里嵌套两级小的环形构造;断裂构造总体有三组:近东西向断裂、北东向断裂及北西向断裂,组成菱形格架。通过对已知矿点、蚀变信息、岩体信息与构造信息之间的关系分析,得出构造与成矿之间关系密切,已知矿点及蚀变信息主要分布在断裂交汇部位及断裂密集区域,最后根据构造背景及蚀变信息预测了4 处区域找矿靶区:铁格隆区段、多不杂波龙区块、地保那木岗区段、色那至赛角区段,目前这四个区块均存在找矿线索。

Structural Pattern and Alteration Information Derived from Remote Sensing Data and Their Significance for Ore Search in the Duolong Copper-Ore Concentration Area of Tibet

Abstract:In this paper, RADARSAT2 quad-polari metric data and ASTER multi-spectral data were processed and analyzed to extract structural pattern and alteration information in the Duolong copper ore concentration area of Tibet. The result shows that this region hosts a big semicircle, in which a second-order and third-order semicircle are embedded. The major faults can be classified into three groups in trends: nearly east-west, north-east and north-west, which constitute a rhombus pattern. Through the analysis of the known mineral deposits, alteration rocks information and structural information, it is demonstrated that the structure was one of the main controlling factors in the mineral forming process. The known mineral deposits and alteration information are mainly distributed in the intersection and areas with dense faults. Finally, according to the structure background and alteration rocks information of this area, four promising ore areas were predicted, including the Tiegelong area, Duobuza-Bolong area, Dibaonamugang area and Senan-Saijiao area, where ore-search clues have been found.