摘要
对地形切割强烈、海拔较高的地区进行遥感解译,正成为地质基础研究的重要手段。青海文巴地区构造变形复杂,晚古生代以来经历多期隆升和岩浆活动,青藏高原东北缘构造活动具有一定代表性。基于遥感数据OLI,通过OIF指数分析得到R∶G∶B为7∶5∶4的最佳波段组合,然后使用格拉姆—斯密特正交化法对图像融合增强处理。结合研究区已有地质资料,建立解译标志,对断裂构造进行遥感解译。结合野外验证探获断裂26条,主要走向为NW向、NE向、近SN向、近WE向,其中大断裂4条,小断裂22条。这对划分构造期次和进一步找矿工作提供了线索。
The remote sensing technology has become the important tool for the basic geological study in the strongly dissected topography and high altitude mountain area. The tectonic deformation in the Wenba area, Qinghai, is very complex, the area has gone through a multi-stages of up-lift movements and magmatic activities since late Paleozoic time, characterized with certain representative tectonic activity of northeastern Qinghai-Tibet plateau. Based on analysis of remote sensing data OLI, the optimal band combination of R ： G ： B is Band7 ： Band 5 ： Band 4 according to the analysis result of OIF index. Then the image fusion enhancement was conducted by Gram-Schmidt orthogonal algorithm. On the basis of existing geological data in the study area, the interpretation criteria was estab- lished, finally the fracture interpretation in the Wenba area was completed. Total 26 faults in the study area were delineated by the field verification, main fault strikes are NW-trending, hrE-trending, nearly SN-trending, nearly WE-trending, among them, there are four large-sized faults, others are small-sized fractures. The study result provide valuable clues for the stage classification of tectonic activities as well as the next stage prospecting work.
出处
《矿产勘查》
2015年第5期571-576,共6页
Mineral Exploration
基金
中国地质调查局地质调查项目(编号:12120113033019)资助
关键词
OIF指数
格拉姆—斯密特正交化法
断裂构造
遥感解译
文巴
青海
OLI, OIF index, Gram-Schmidt orthogonal algorithm：, fracture structures, remote sensing interpretation
