【摘要】 库车坳陷是南天山中段新构造运动异常强烈的地区,内部发育有四排近EW向展布的逆断裂-背斜带,由南天山山前向塔里木方向依次为:山麓逆断裂-背斜带;喀桑托开逆断裂-背斜带;秋里塔格逆断裂-背斜带和亚肯盲逆断裂-背斜带.东秋里塔格背斜属秋里塔格逆断裂-背斜带东段部分,其构造运动尤为强烈.研究表明:东秋里塔格背斜是浅部滑脱面与其南翼逆冲断层共同形成的断层传播-滑脱混生褶皱,背斜南翼的浅层逆冲断层和深层的断坡构造是重要孕震场所.东秋里塔格浅部背斜核部的背冲式断裂和北翼的膝折属于派生的次级构造,断裂的规模、错动量有限.东秋里塔格背斜南翼逆断层最新活动错断Ⅱ级阶地砾石层,其活动年代至少为全新世早期,这次错动在地表留有3~4km长的古地震破裂形迹,说明断裂具粘滑运动特征.更多还原

【Abstract】 The Kuqa depression is located in the middle segment of the southern Tianshan Mountains.There are four E-W extending rows of reverse fault and anticline zones in the depression. From the south Tianshan Mountains towards the Tarim basin, they are the mountain piedmont, the Kasangtuokai, the Qiulitag and the Yaken reverse fault and fold zones. The most recent active fold in this system is the Qiulitag fold belt. Dongqiulitag anticlinal zone belongs to east segment of Qiulitag reverse fault and fold zone. Comparing with other tectonic belts, new tectonic movement of the east segment is very strong. Research shows that dongqiulitag anticlinal is fault propagation-detachment mixed-fold, which results from effect of shallow detachment surface and reverse fault locating south of Dongqiulitag anticlinal. In the south of Dongqiulitag anticlinal, shallow reverse fault and deep ramp structure are important seismogenic locus. Back thrusting fault of shallow anticlinal core and kinking of the north wing of Dongqiulitag anticline belong to derivative secondary-structure. Size of the rupture and disturbance is finite. Latest activity of reverse fault, which locates south wing of the Dongqiulitag anticline, dislocated II terrace gravel layer. Activity date of the reverse fault is not less than earlier Holocene Epoch. The disturbance leaves paleoearthquake fractured trace behind in the ground surface, which is 3-4 kilometre. It shows that the rupture features of stick-slip movement.更多还原