塔里木盆地巴楚—柯坪地区南北向断裂系统的空间对应性研究

CORRESPONDING RELATION OF S-N-STRIKING FAULT SYSTEMS IN THE BACHU-KALPIN AREA, TARIM BASIN

巴楚隆起和柯坪冲断褶皱带是塔里木盆地西北部的两个构造单元。前者的断裂以南北向为主 ,这些断裂在平面上向北切入到柯坪东西走向的冲断带内部 ,并与之成近于正交的关系。对柯坪冲断褶皱带内部早期南北向断层的研究发现它们与巴楚隆起的断层存在着逐一对应的联系 ,在此基础上进一步确定出色力布亚断裂—皮羌断裂的连续对应型关系、阿恰断裂—萨拉姆布拉克背斜南部断裂叠加改造对应型关系和一间房断裂—一间房北断裂隐伏对应型关系。不同的对应关系与断裂的规模和活动性有紧密的联系。断裂对应性的研究指出巴楚与柯坪构造带早期属于塔里木盆地内部同一个构造单元。

The Bachu and Kalpin structural belts were two tectonic units in the Tarim Basin. The strike of faults in the Bachu uplift was mostly south north direction. The structure lines of Bachu and Kalpin regions met at right angles. We thought that the S N striking faults had internal relation in the both regions. There were three different corresponding styles, namely, 1)continuous corresponding: the Selibuya and Piqiang faults being an example; 2)superimposed deformation corresponding, such as the Aqia and Salamubulake faults; and 3)buried corresponding, like the Yijianfang fault. Every relation reflected activity of the faults. The results pointed out that the Bachu Kalpin structural belts were once one unit before Pliocene in the Tarim Basin, so the structural style of the Kalpin thrust belts was restricted by early faults.