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首页> 外文期刊>Journal of Asian earth sciences >Active strike-slip faulting in the Zagros Mountains: Geological and geomorphological evidence of the pull-apart Zaribar Lake basin, Zagros, NW Iran
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Active strike-slip faulting in the Zagros Mountains: Geological and geomorphological evidence of the pull-apart Zaribar Lake basin, Zagros, NW Iran

机译：扎格罗斯山脉的活跃走滑断层：伊朗西北部扎格罗斯的拉里扎里巴尔湖盆地的地质和地貌证据

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摘要

The Zaribar Lake is situated along the Main Recent Fault, a dextral major strike-slip active fault system in the Zagros collision zone. The formation of the Zaribar Lake in Late Pleistocene is associated with the activities of the Main Zagros Reverse Fault, initiated in Late Oligocene, and with the Main Recent Fault, whose inception occurred about 5 Ma ago. Metamorphic, intrusive and ophiolitic rocks in the Zagros suture zone are affected by a normal fault system in the Zaribar area. Geometry and kinematics of these normal faults indicate that the Zaribar Lake is generated in a releasing zone. The strike of the Main Recent Fault varies from 300 degrees to 330 degrees along the Marivan fault segment. The releasing bend of the Marivan Fault around the Zaribar Lake has resulted in the extensional deformation by which the lake has been downdropped between two strike-slip faults. Besides the extensional mechanism of the main right-lateral strike-slip faults that has resulted in the formation of the Zaribar as a large-scale pull-apart basin, minor strike-slip faults have also produced specific landforms around the lake. Small-scale normal faults and large scale grabens developed around the lake are geological indicators of extensional areas. Geomorphological evidence also support the pull-apart origin for the Zaribar Lake. Beheaded rivers, numerous offsets in drainage system, half-broom shaped drainage pattern, sag ponds with different scales, linear and strike-parallel valleys and alluvial fan with high sweep angle and width/length ratio confirm the movements along right-lateral, strike slip faults around the Zaribar.
机译：Zaribar湖位于主要新近断层，这是Zagros碰撞带中的一个右旋大走滑活动断层系统。晚更新世Zaribar湖的形成与晚渐新世开始的主要Zagros逆断层的活动以及始于约5 Ma的最近主要断层有关。扎格罗斯缝线区的变质岩，侵入岩和片石质岩受到Zaribar地区正常断层系统的影响。这些正常断层的几何学和运动学表明，扎里巴尔湖是在释放区产生的。最近的主要断层的走向沿马里文断层段的走向从300度到330度不等。扎里巴尔湖周围的马里万断裂的释放弯曲导致了拉张变形，使该湖在两个走滑断层之间下垂。除了主要的右侧走滑断层的伸展机制导致扎里巴尔形成为大型的拉脱盆地外，较小的走滑断层还在湖周围形成了特定的地貌。湖周围发育的小型正断层和大型grab陷是扩展区的地质标志。地貌学证据也支持扎里巴尔湖的拉动起源。断头的河流，排水系统的许多偏移，半-帚状的排水方式，不同规模的凹陷池，线性和走向平行的山谷以及具有高后掠角和宽长比的冲积扇，证实了沿右侧的运动，走向滑移Zaribar周围的断层。

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