Morphotectonic aspects in a part of Naga-Schuppen belt, Assam-Nagaland region, Northeast India

科技视界 Pub Date : 2019-03-31 DOI:10.33493/SCIVIS.19.01.02

Farha Zaman, D. Bezbaruah

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引用次数: 2

Abstract

The Belt of Schuppen is an important tectonic element of the Assam-Arakan basin. It is a narrow belt of thrust slices in southeastern boundary of the Assam valley. The Naga Schuppen Belt, consisting of eight or more imbricated thrusts, occurs between the Naga and Disang thrusts. This present study encompasses an area of 4,720 sq km along the Assam-Nagaland border. The Dikhow River, which is a seventh order basin, originates from Naga Hills flowing through a total length of 240 km in the Assam valley and reaches the Brahmaputra. In this study, the morphotectonic analysis of the Dikhow River was carried out to understand the role of active tectonics of the Naga Hills in Nazira-Naginimora areas of Assam and Nagaland respectively. The parameters such as asymmetric factor (AF), transverse topographic symmetric factor (T), and stream length gradient index (SL) were computed. Absolute AF values shows asymmetric to highly asymmetrical shape of the basins (range III-IV) which is also supported by T values. Anomalous SL values were obtained wherein major lineament and tectonic features are present. This indicates that the study area is tectonically active. Further, in the Assam valley it has been observed in the bank stratigraphy of Dikhow River that the Quaternary sediments are deformed. This deformation of the soft older alluvium indicates that the area is undergoing deformation during post Pliocene time. This evidence demands the morphotectonic evaluation of the aforesaid area to demarcate the tectonic activeness of the region in post Pliocene times.

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印度东北部阿萨姆-那加兰邦地区那加-舒本带部分地区的形态构造特征

舒彭带是阿萨姆-阿拉干盆地的一个重要构造元素。它是阿萨姆邦山谷东南边界的一条狭窄的逆冲断层带。那迦逆冲带位于那迦逆冲和底桑逆冲之间，由八个或更多的叠瓦状逆冲组成。目前的研究涵盖了阿萨姆邦-那加兰邦边境4720平方公里的区域。迪夸河是第七级盆地，发源于纳迦山，在阿萨姆邦山谷流经240公里，到达雅鲁藏布江。本文通过对Dikhow河的形态构造分析，了解了阿萨姆邦和那加兰邦Nazira-Naginimora地区纳迦山活动构造的作用。计算了不对称因子(AF)、横向地形对称因子(T)和河流长度梯度指数(SL)等参数。绝对AF值显示盆地形状不对称至高度不对称(范围III-IV)，这也得到了T值的支持。在主要的地貌和构造特征存在的情况下，获得了异常的SL值。这表明研究区具有构造活动性。此外，在阿萨姆河谷，在Dikhow河的河岸地层中观察到第四纪沉积物是变形的。这种古软冲积层的变形表明该地区在上新世后发生了变形。这一证据要求对该地区进行形态构造评价，以确定该地区在上新世后的构造活动性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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科技视界

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期刊介绍： Science & Technology Vision is a science and technology journal supervised by the Shanghai Association for Science and Technology and sponsored by the Shanghai Science Writers Association. It takes grassroots science and education workers as readers, popularizes scientific knowledge, tracks hot issues in science and technology at home and abroad, pays attention to new developments, new technologies, and new achievements in the forefront of the science and technology community, adheres to the combination of theory and practice, popularization and exploration, integrates scientificity, knowledge, academicity, and foresight, and builds a platform and theoretical position for academic debate for the majority of science and technology workers. Science & Technology Vision has been fully included in "China National Knowledge Infrastructure", "Chinese Science and Technology Journal (VIP) Database", "Longyuan Journal Network", "Education Reading Network", and "Wanfang Database".