摘要:
津巴布韦大岩墙(简称“大岩墙”)由形成于25亿a前的镁铁质-超镁铁质杂岩构成,盛产铂、钯、金、铬、镍、铜等矿产资源,是我国境外地质矿产资源勘查的重点地区之一。为适应我国矿产资源勘查开发“走出去”战略的需要,为大岩墙地区基础地质研究和找矿勘查快速提供基础资料,利用ETM+卫星数据对大岩墙的几何要素和地质特征进行了系统解译,从遥感地质角度对大岩墙的岩浆房划分方案进行了验证;利用ZY-102C高分辨率卫星数据对塞卢奎次岩浆房的形态、岩性、内部构造及矿业活动进行了详细解译和分析,提出其东西两侧围岩的不同是导致其变形强度差异的重要原因,超镁铁质岩层应是寻找铬铁矿的主要岩层;并探讨了遥感技术在境外地质矿产勘查领域的“五尺度”工作方法,为遥感技术在境外地质调查中的应用奠定了技术基础。
Abstract:
The Great Dyke in Zimbabwe, which possesses abundant platinum, palladium, gold, chromium, nickel, copper and some other resources, is a major intrusion of mafic and ultramafic rocks formed at 2. 5 Ga and one of the key regions for mineral exploration abroad. In order to attain the aim of"going out" for China’ s mineral exploration and provide basic geological information of geological survey and mineral exploration in the area of the Great dyke, the authors carried out the systematic interpretation of geometric elements and geological characteristics of the Great Dyke in Zimbabwe based on the ETM+ data and verified the division of the magma chamber of the Dyke. Combined with the ZY-1 02C high spatial resolution satellite data, the authors identified and interpreted the shape, lithology, interior structures and mining activities of the Selukwe Subchamber. The results achieved show that, because of the difference between the west and east host rocks, the Selukwe Subchamber underwent deformations of different intensities. The ultramafic layers should be regarded as the major layers for the chromite exploration. Furthermore, the authors have discussed the method of "five scales" of the remote sensing technique in the geological survey abroad and provided the technical support for the remote sensing application.
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