There exist Jurassic and Cretaceous basins in the Beishan Alaxa area. The Jurassic basins are controlled by near EW trending faults, and the faulted basins extend in EW direction.
研究区发育侏罗纪盆地和白垩纪盆地，侏罗纪盆地受近东西向断裂的控制，为东西向展布的断陷湖盆。
The Alaxa region is divided by the suture into two parts-one to the north belonging to the Tarim plate and the other to the south being the northern margin of the north China plate.
以恩格尔乌苏蛇绿混杂带为界，阿拉善南北两区分别属于华北板块和塔里木板块。
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