河西走廊榆木山边缘断层构造地貌研究

ON THE TECTONIC LANDFORM OF THE YUMU MOUNTAIN,HEXI CORRIDOR,GANSU PROVINCE

河西走廊位于青藏高原的东北部边缘，是青藏高原向东北推挤过程中形成的一个前陆盆地系。榆木山是位于河西走廊前陆盆地系中张掖盆地和酒东盆地之间的横向隆起山地。根据野外断层露头和地貌体的变形测量和分析，本文认为榆木山北缘断层是一条具有左旋位移的逆断层，东缘断层是一条具有右旋位移的逆断层，这两条断层在全新世期间都有明显的活动。榆木山的发育是沿着北缘断层和东缘断层的逆冲活动。

,The Hexi Corridor,located in the northeastern margin of the Qinghai Tibetan plateau,is a foreland basin system formed by the northeastward push of the plateau.The Yumu mountain is a transverse highland between the Zhangye basin and Jiudong basin in the system.Based on the field study of fault outcrops and landform deformations,combining with TL and 14C ages,it is concluded that the north marginal fault of the Yumu mountain is a thrust with left lateral slipping and the east marginal fault is a thrust with right lateral slipping,and the Yumu Mountain developed from the resulting uplifting of the Yumu Mountain block along these faults.