Morpho-structural signatures of neotectonic activity along the HFT bound Himalayan mountain front in Kathgodam-Chorgallia sector of NW Himalaya, India

IF 2.9 Q2 GEOGRAPHY, PHYSICAL
Nigar Jahan , Yogendra Pratap Rana , Ram Jivan Singh , Resmi Sathikumar , Sheikh Nawaz Ali , Mohammad Atif Raza
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Abstract

Thrusting supports the development of diverse landforms and deformational structures in the Himalayan Frontal Thrust (HFT) region between Kathgodam and the Chorgallia sector, according to this study. The influence of the active tectonic condition in the area was analyzed using seven geomorphic indices, which also underlined the importance of morpho-structural study utilizing remote sensing, geomorphic indices, tectono-geomorphic landforms, field evidence, and luminescence dating. The investigation of sub-basins surrounding the HFT reveals moderate to high tectonic activity, with tectonic activity concentrating in the eastern half and decreasing toward the west. A topographic discontinuity was also observed in the region as indirect active tectonic evidence. Hanging wall rocks have well-preserved features that govern tectonic transport direction, and the HFT in this region is emergent. Shear sense indications point to southerly tectonic migration, with a few modest northward shear senses indicating northward movement, which might be attributable to reverse thrusting along the HFT at some time during the Outer Himalaya's tectonic history. Petrographic investigations reveal sustained frontal deformation at various intervals, with well-preserved thrust-induced deformation fingerprints in deformed rocks throughout the Jam Raula and Sukhi nadi sections. Micro thrust duplexes, or micro-scale asymmetrical drag folds, are shown in thin section investigations as a result of HFT-related brittle-ductile deformation at moderate temperature and pressure. The sandy unit from the Quaternary sediments yields 10 ± 0.8 ka, 11.8 ± 0.7 ka, 17 ± 1 ka, and 56 ± 3 ka quartz OSL dates, demonstrating the migration of hanging wall rocks on footwall post-Siwalik fluvial deposits along the HFT plane and reactivation of the HFT in the study area.

印度西北喜马拉雅山脉 Kathgodam-Chorgallia 地区 HFT 边界喜马拉雅山前沿新构造活动的形态结构特征
根据这项研究,在加斯古丹(Kathgodam)和乔尔加利亚(Chorgallia)地段之间的喜马拉雅前沿推力(HFT)地区,推力支持了各种地貌和变形结构的发展。研究利用七种地貌指数分析了该地区活跃构造条件的影响,同时强调了利用遥感、地貌指数、构造地貌地形、实地证据和发光测年进行形态结构研究的重要性。对高纬度地区周围子盆地的调查显示,构造活动程度为中度到高度,构造活动集中在东半部,向西逐渐减弱。在该区域还观察到地形的不连续性,这是间接的活动构造证据。悬壁岩具有保存完好的构造运移方向特征,该地区的高频构造正在形成。剪切感应迹象表明构造向南迁移,少量向北的剪切感应迹象表明构造向北迁移,这可能是外喜马拉雅构造历史上某个时期沿悬壁岩构造反向推移所致。岩相学调查显示,在不同的区间存在持续的锋面变形,在整个杰姆劳拉(Jam Raula)和苏基纳迪(Sukhi nadi)地段的变形岩石中都有保存完好的推力诱导变形指纹。薄片研究显示,微推力双折或微尺度不对称拖曳褶皱是在中等温度和压力下与高推力变形相关的脆性-韧性变形的结果。第四纪沉积物中的砂质单元得出了 10 ± 0.8 ka、11.8 ± 0.7 ka、17 ± 1 ka 和 56 ± 3 ka 的石英 OSL 日期,证明了悬壁岩在沿高冲击地层平面的脚壁后西瓦利克河川沉积物上的迁移以及高冲击地层在研究区域的重新激活。
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来源期刊
Quaternary Science Advances
Quaternary Science Advances Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
4.00
自引率
13.30%
发文量
16
审稿时长
61 days
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