A strike‐slip core complex from the Najd fault system, Arabian shield
A strike‐slip core complex from the Najd fault system, Arabian shield
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DOI：
10.1111/ter.12111
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发表时间：
2014-10
期刊：
影响因子：
2.4
通讯作者：
Sven Erik Meyer;C. Passchier;T. Abu-Alam;K. Stüwe
中科院分区：
文献类型：
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作者：
Sven Erik Meyer;C. Passchier;T. Abu-Alam;K. Stüwe
变质核杂岩通常被认为与区域地壳伸展和地壳减薄有关，其中深部地壳物质沿沿着倾斜于区域伸展方向的缓倾正剪切带被挖出。我们提出了一种新的机制，使变质核杂岩可以出露沿着地壳规模的走滑断层系统，容纳地壳缩短。沙特阿拉伯的Qazaz变质穹隆是在地壳规模的垂直走滑断层带中沿着沿着的缓倾角挖出的，该断层带通过30 km的横向运动导致下地壳岩石的挖出超过25 km。随后，复合体被走滑断层带的分支横切，并且这些部分被另外30 km的横向运动分开。像Qazaz Dome这样的走滑核复合体可能很常见，并且可能对地壳强度产生重要的局部影响。
Metamorphic core complexes are usually thought to be associated with regional crustal extension and crustal thinning, where deep crustal material is exhumed along gently dipping normal shear zones oblique to the regional extension direction. We present a new mechanism whereby metamorphic core complexes can be exhumed along crustal‐scale strike‐slip fault systems that accommodated crustal shortening. The Qazaz metamorphic dome in Saudi Arabia was exhumed along a gently dipping jog in a crustal‐scale vertical strike‐slip fault zone that caused more than 25 km of exhumation of lower crustal rocks by 30 km of lateral motion. Subsequently, the complex was transected by a branch of the strike‐slip fault zone, and the segments were separated by another 30 km of lateral motion. Strike‐slip core complexes like the Qazaz Dome may be common and may have an important local effect on crustal strength.