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首页> 外文会议>The 28th International Symposium on Remote Sensing of Environment, Mar 27-31, 2000, Cape Town, South Africa >STRUCTURAL ANALYSIS OF THE ASMARA AREA, ERITREA USING REMOTE SENSING AND GIS
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STRUCTURAL ANALYSIS OF THE ASMARA AREA, ERITREA USING REMOTE SENSING AND GIS

机译：遥感和地理信息系统对阿斯马拉地区，厄立特里亚地区的结构分析

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摘要

The Pan-African terrain of Eritrea is mainly composed of a folded metavolcano-sedimentary assemblages intruded by syn- to post-tectonic granites and granodiorites. Interpretation of enhanced Landsat TM data supported by field observation has provided a good basis for outlining the main stratigraphic and structural features of the Asmara area, Eritrea that went unnoticed before. Four phases of deformation were identified in the area. The first phase was folding accompanied by low-grade metamorphism (greenschist facies). Two dextral strike-slip shear zones, Adi Gebru and Asmara, were formed during the second deformation phase. Alteration of plagioclase to sericite and epidote and the presence of chlorite is common within the shear zones suggesting retrograde metamorphism. The intensity of shearing decreases from west to east. The third and fourth phases were characterised by open folding and brittle faulting respectively.
机译：厄立特里亚的泛非地形主要是由同构造后花岗岩和花岗闪长岩侵入的折叠的准火山-沉积组合组成。野外观测支持的增强型Landsat TM数据的解释为概述以前未曾注意到的厄立特里亚阿斯马拉地区的主要地层和结构特征提供了良好的基础。在该区域确定了四个变形阶段。第一阶段是折叠，并伴有低级变质作用（绿片岩相）。在第二变形阶段形成了两个右旋走滑剪切带，即Adi Gebru和Asmara。斜长石向绢云母和附子的转变以及亚氯酸盐的存在在剪切区内很常见，这表明逆行变质作用。剪切强度从西向东减小。第三阶段和第四阶段的特征分别是断层折叠和脆性断裂。

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