利用卫星影像和构造模拟探索孟加拉盆地西北部基底面关系
Exploring Basement Surface relationship of north-west Bengal Basin using satellite images and tectonic modeling
摘要：
孟加拉盆地是最厚的沉积盆地之一，并不断受到印度板块与缅甸和西藏板块碰撞的影响。盆地的西北部，我们的研究区，是一个最浅的断层基底存在的最少勘探的地区。关于基底的起源及其对地表地貌形成的作用存在争议。通过对卫星影像、布格异常资料的分析，建立了断裂基底与地表地貌关系的地球动力学模型。卫星图像和重力异常显示了地表地形与基底断裂构造之间的空间相关性。高地和低洼的洪泛平原位于重力高（地垒）和重力低（地堑）的顶部。地球动力学模型表明，地垒下方可能存在共轭逆冲断层，将地垒块体向上推。我们的观察表明，区域性挤压和基底断裂对地表地貌的发展，如隆起地带和低洼的洪泛平原有更大的影响。
英文摘要：
The Bengal basin is one of the thickest sedimentary basins and is being constantly affected by the collision of the Indian plate with the Burma and Tibetan plates. The northwest part of the basin, our study area, is one of the least explored areas where the shallowest faulted basement is present. Controversies exist about the origin of the basement and its role to the formation of surface landforms. We analyze satellite images, Bouguer anomaly data, and develop a geodynamic model to explore the relationship between the faulted basement and surface landforms. Satellite images and gravity anomalies show a spatial correlation between the surface topography and basement fault structures. The elevated tracts and the low-lying flood plains are located on top of the gravity highs (horsts) and lows (grabens). The geodynamic model suggests that conjugate thrust faults may exist beneath the horsts that push the horst block upward. Our observations suggest the regional compression and basement faults have a more considerable influence on the development of surface landforms such as the uplifted tracts and the low-lying flood plains.
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