准噶尔盆地南缘背斜构造变形与河流作用关系探讨

Interplay between Deformation Characteristics and River in the Southern Margin of Junggar Basin

霍尔果斯背斜和安集海背斜分别位于准噶尔盆地南缘山前第2、第3排构造带。安集海河和金沟河横向穿越第3排背斜带时发生河流改道,但是穿越第2排背斜带的横向河流并没有因为构造隆升的不均一发生河流改道,相反横向河流穿越背斜时,对于不同的背斜,有横向河流强烈切割背斜拱顶背斜,横向河流下切幅度大背斜隆升高度大;对于在同一背斜,横向河流切割背斜拱顶的隆升速率比横向河流切割背斜两翼的隆升速率要快。在研究准噶尔盆地南缘山前带背斜构造变形和河流作用关系时应该考虑的不仅是构造变形对河流的影响,而且要考虑到河流的侵蚀下切的主动作用以及相关时间段内气候因素的影响。

The Huoerguosi anticline and Anjihai anticline lie separately in the second and the third structure belts of the southern Junggar Basin.Anjihai River and Jigou River change while they are cut across the third anticline belts.But the rivers passed through the second anticline belts are not river diversions because the unequal of tectonic uplift.On the contrary,for different anticlines,the greater the degree of transverse rivers undercut,the bigger the anticline uplift is.For the same anticline,the uplifting rate in the vault anticline is bigger than lateral wings.The research shows that to study the interplay between structure deformation and river in the Southern Margin of the Junggar Basin,not only the influence of tectonic deformation of the river,also the active role of river incision,as well as climate factors should be considered.