【摘要】 玛纳斯河是天山北麓最大的一条河流,流域内山前地貌对构造活动有明显的响应。根据野外调查和综合分析,结果表明天山北麓在南北向的挤压作用下,在山前依次形成了3排褶皱低山丘陵和第四排正在发育的西湖隆起。冲积扇也在历次构造运动中不断向北推进,呈串珠状发育。褶皱丘陵内阶地的也发生了拱曲变形。这些特征反映了自第四纪以来,天山北麓随着天山主体在不断抬升,并且持续地由南向北推挤,使山麓范围不断地向盆地方向扩张。更多还原

【Abstract】 The Manas River is the largest stream in the north margin of the Tianshan Mountains and tectonic activity has distinct influences on the landform in the north margin of the Tianshan Mountains.Based on the filed survey and analysis,the result shows that north-west compression resulted in three rows of folding in the northern piedmonts of the Tianshan Mountains and also is responsible for the fourth fold of the Xihu which is still developing.Every anticline is steep in the northern limb and gentle in the southern limb.The ages of three folds become younger northward,while the altitude and range of the three folds decrease correspondingly.Three fans developed in the shape of cluster,and are controlled obviously by reverse faults.Terraces were warped and faulted by tectonic deformation of the second-class and the third-class folds,indicating that the Tianshan Mountain has been uplifting since Quaternary period,and its compression toward north from sough is causing the piedmontis to continuously expand toward the Junggar basin.更多还原