ABSTRACT

The morpho-tectonic characteristics of the study area were evaluated due to paleo-tectonic significance. The Upper Tons Basin is associated with the Ganga river system, originated over the fracture zones produced after the collision of Indian and Eurasian plates; hence, the study region has its tectonic importance with small-scale tectonic deformation. The relief, drainage and tectonic characteristics are analyzed by using digital elevation model and topographical maps, geomorphic indices, lineaments and transverse profiles. Result reveals that two-third areas are in declining from mature stage (H_I < 0.50) or monadnock phase (H_I < 0.40). The value of basin asymmetry factor is suggesting right-side tilting of the trunk stream due to the tributaries of the Tons river originating over the Bhander uplands being longer. Further, the comparison of the stream length gradient with normalized stream length gradient shows delineating tectonically anomalous regions, and the anomalous points are addressed in the longitudinal profiles. The scarps fronts of the plateau are more sinuous and highly eroded, while the straight Kaimur fronts indicate relatively sensitive fronts. The relative tectonic activity index helps to evaluate the potential tectonic activity of a drainage basin and drainage network developed over the tectonically pre-designed valley.

摘要

由于古构造意义，对研究区的形态构造特征进行了评估。上吨盆地与恒河系统有关，起源于印度和欧亚板块碰撞后产生的断裂带；因此，研究区具有小规模构造变形的构造重要性。利用数字高程模型和地形图、地貌指标、地貌和横向剖面，分析了地势、排水和构造特征。结果表明，三分之二的地区正处于从成熟期（H _I < 0.50）或单峰期（H _I< 0.40)。盆地不对称因子的值表明干流向右倾斜，因为源自 Bhander 高地的 Tons 河的支流更长。此外，河流长度梯度与归一化河流长度梯度的比较显示了构造异常区域的轮廓，异常点在纵向剖面中得到解决。高原的陡峭锋面更加弯曲且侵蚀程度较高，而笔直的凯穆尔锋面则表明相对敏感的锋面。相对构造活动指数有助于评估在构造预先设计的山谷上开发的流域盆地和流域网络的潜在构造活动。