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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Geomorphic response to an active transpressive regime: A case study along the Chaman strike-slip fault, western Pakistan
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Geomorphic response to an active transpressive regime: A case study along the Chaman strike-slip fault, western Pakistan

机译：地貌对主动压降作用的响应：以巴基斯坦西部查曼走滑断层为例

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摘要

The Chaman left-lateral strike-slip fault bounds the rigid Indian plate boundary at the western end of the Himalayan-Tibetan orogen and is marked by contrasting topographic relief. Deformed landforms along the fault provide an excellent record for understanding this actively evolving intra-continental strike-slip fault. The geomorphic response of an active transpessional stretch of the Chaman fault was studied using digital elevation model (DEM) data integrated with Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Visible and Near Infrared/Short Wave Infrared (VNIR/SWIR) and images from GeoEye-1. Geologic and geomorphic mapping helped in reconstructing the Late Quaternary landscape history of this transpessional strand of the Chaman strike-slip fault and the associated Spinatizha thrust fault in western Pakistan. Topographic analysis of a part of the transpression (the thrust bounded Roghani ridge) revealed northward growth of the Spinatizha fault with the presence of three water gaps and two corresponding wind gaps. Geomorphic indices including stream length-gradient index, mountain front sinuosity, valley floor width to valley height ratios, and entrenchment of recent alluvial fan deposits were used to define the lateral growth and direction of propagation of the Spinatizha fault. Left-lateral displacement along Chaman fault and uplift along the Spinatizha fault was defined using topographic analysis of the Roghani ridge and geomorphic mapping of an impressive alluvial fan, the Bostankaul fan. The landforms and structures record slip partitioning along the Indian plate boundary, and account for the convergence resulting from the difference in the Chaman fault azimuth and orientation of the velocity vector of the Indian plate.
机译：查曼左旋走滑断层以喜马拉雅-西藏造山带西端的刚性印度板块边界为界，并以对比地形起伏为特征。沿断层变形的地貌为了解这一活跃的大陆内部走滑断层提供了极好的记录。利用数字高程模型（DEM）数据与先进的星载热发射和反射辐射计（ASTER）可见光和近红外/短波红外（VNIR / SWIR）集成的图像，研究了Chaman断层活动横穿伸展带的地貌响应。 GeoEye-1。地质和地貌图有助于重建巴基斯坦西部查曼走滑断层和相关的Spinatizha逆冲断层的该跨断带的第四纪晚期景观史。对部分压变（逆冲以Roghani脊）进行的地形分析表明，Spinatizha断层向北生长，存在三个水隙和两个相应的风隙。地貌指数包括河流长度梯度指数，山前弯曲度，谷底宽度与谷高之比以及最近冲积扇沉积物的固结作用，用于定义Spinatizha断层的横向生长和传播方向。使用Roghani脊的地形分析和令人印象深刻的冲积扇Bostankaul扇的地貌图，定义了沿Chaman断层的左侧位移和沿Spinatizha断层的隆升。地貌和构造记录了沿印度板块边界的滑动分区，并解释了由Chaman断层方位角和印度板块速度矢量方向的差异引起的收敛。

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