Caledonian movement made the north Qilian geosyncline become a folded zone diving to Alashan paleoland so that the geosyncline Vanished, resulting in a foundation for the apprearance of basin.

 
  • 加里東運動(dòng)使北祁連地槽最終回返褶皺向阿拉善古陸俯沖,結束了地槽發(fā)展階段,奠定了盆地的基礎。
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