Contrasting styles of convergence in the Arabia-Eurasia collision: why escape tectonics does not occur in Iran
Contrasting styles of convergence in the Arabia-Eurasia collision: why escape tectonics does not occur in Iran
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DOI：
10.1130/2006.2409(26
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. Allen;E. Blanc;R. Walker;J. Jackson;M. Talebian;Mohammad Reza Ghassemi
中科院分区：
文献类型：
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作者：
M. Allen;E. Blanc;R. Walker;J. Jackson;M. Talebian;Mohammad Reza Ghassemi
土耳其在北安纳托利亚断层和东安纳托利亚断层之间相对于欧亚大陆的向西运动被认为是大陆地壳从碰撞带（在这种情况下是阿拉伯-欧亚大陆碰撞）横向迁移的最好例子之一。这个过程被称为“逃逸”或“挤压”构造。Alborz内的距离平行走滑断层（例如，Mosha断层）和扎格罗斯山脉（主要的现代断层）的作用被认为与北安纳托利亚断层和东安纳托利亚断层的作用相似，它们是伊朗地壳从阿拉伯板块相对于欧亚大陆的向北运动中向东迁移的原因。然而，地震活动和GPS数据都表明，伊朗地壳相对于欧亚大陆没有净向东迁移。在这里，我们总结了伊朗的构造活动山脉变形的逆冲和走滑运动的组合倾斜的整体收敛矢量在每个地区，而不需要净东向运动相对于欧亚大陆。一个普遍的结论是，碰撞带中的走滑断层可能具有不同的作用。这些不仅包括在土耳其展示的地壳物质的横向运输，而且还划分应变到缩短和走滑组件所示的Alborz和Zagros结构和住宿的地壳缩短的走滑断层旋转的垂直轴。
The westward motion of Turkey relative to Eurasia between the North and East Anatolian faults has been cited as one of the best examples of lateral transport of continental crust from a collision zone, in this case the Arabia-Eurasia collision. This process is variously called “escape” or “extrusion” tectonics. Range-parallel strike-slip faults within the Alborz (e.g., the Mosha fault) and Zagros Mountains (the Main Recent fault) of Iran have been regarded as playing roles similar to those of the North and East Anatolian faults in that they are responsible for the eastward transport of intervening Iranian crust away from the northward motion of the Arabia plate relative to Eurasia. However, both seismicity and GPS data show that there is no net eastward transport of Iranian crust with respect to Eurasia. Here we summarize how the tectonically active mountain ranges of Iran deform by combinations of thrusting and strike-slip movement oblique to the overall convergence vector across each region, without requiring net eastward movement with respect to Eurasia. A general conclusion is that strike-slip faults in collision zones can have different roles. These include not only the lateral transport of crustal material demonstrated in Turkey, but also the partitioning of strain into shortening and strike-slip components shown by the Alborz and Zagros structures and the accommodation of crustal shortening by strike-slip faults that rotate about a vertical axis.