阿拉善地块北缘的蛇绿混杂岩带及其大地构造意义  

OPHIOLITIC MELANGE BELTS IN THE NORTHERNMARGIN OF THE ALASHAN BLOCK

作　　者：吴泰然[1] 何国琦[2] 

机构地区：[1]中国地质大学 [2]北京大学

出　　处：《现代地质》1992年第3期286-296,共11页Geoscience

基　　金：自然科学基金资助项目

摘　　要：阿拉善地块北缘新近发现两条蛇绿混杂岩带,即恩格尔乌苏蛇绿混杂岩带和查干础鲁蛇绿混杂岩带。这两条蛇绿混杂岩带在地球化学特征和构造特征等方面都有各自的特点。前者规模巨大,表现为洋壳的性质,是华北地台和中亚陆块的最终缝台线;后者表现为弧后小洋盆的性质,是华北地台北缘的一条岛弧和地台的缝合线。这两条蛇绿混杂岩带的发现,以及对它们性质的研究。对该区的构造单元划分和大地构造演化研究有着重要的意义。并为邻区的对比研究提供了依据。There are two ophiolitic melange belts discovered recently in the northern margin of the Alashan block, i. e. The Engeerwusu and the Chaganchulu belts. Each of them pocesses its own characteristics both in structure and in pertrological geochemistry etc. The Engeerwusu belt manifests the oceanic properties with an enormous scale. It is a suture between the North China Platform and the Mid - Asian Continent. While the Chaganchulu Belt shows the properties of back-arc basin. It is a suture of the North China Platform with an island arc in its northern margin. The discovery of the two ophiolitic melange belts are very important for the study of the tectonic evolution and the division of tectonic units in the Alashan region.

关 键 词：蛇绿混杂岩 阿拉善 玄武岩 地块 

分 类 号：P583[天文地球—岩石学]