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地质论评  2009 

柴达木盆地东北部新近纪构造旋转及其意义

Keywords: 构造旋转,新近纪,柴达木盆地,阿尔金左旋走滑断裂,温泉右旋走滑断裂

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Abstract:

青藏高原东北缘构造变形的研究是认识高原隆起过程、机制和印度―欧亚板块碰撞远程效应的重要途径。柴达木盆地是印度-欧亚板块碰撞后南北向挤压应力为动力背景的高原东北部内陆盆地,沉积物主要来自于周边山地,完整的保存了新生代以来高原隆升的详细记录。通过柴达木盆地东北部瑙格剖面精细古地磁及构造旋转研究发现,20.1~15.1Ma以及15.1~8.2Ma柴达木盆地分别发生了9.7°±7.4°和6.4°±4.4°的顺时针旋转,约8.2Ma后,柴达木盆地东北部瑙格地区发生了16°±7.5°的逆时针快速旋转。通过分析认为,前两次的顺时针构造旋转事件可能与阿尔金断裂的左旋走滑有关。而约8?2Ma以来的逆时针旋转事件属于柴达木盆地东北部瑙格地区的局部旋转,可能与温泉断裂的右旋走滑有关,说明青藏高原东北部在昆仑山、阿尔金山和祁连山三条巨型断裂系左旋相对运动的宏观控制下形成的NNW向温泉右旋走滑断裂开始走滑的年代为约8Ma。

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