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首页> 外文期刊>Journal of Asian earth sciences >Late Quaternary Deflections of the Beas-Satluj rivers at the Himalayan mountain front, Kangra re-entrant, India: Response to fold growth and climate
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Late Quaternary Deflections of the Beas-Satluj rivers at the Himalayan mountain front, Kangra re-entrant, India: Response to fold growth and climate

机译：印度康拉再入的喜马拉雅山脉前部的比斯-萨特鲁日河的第四纪晚期变形：对褶皱生长和气候的响应

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摘要

Late Quaternary fluvial deposits along the Janauri (JA; comprises Siwalik rocks) and Bhaddi (BA; dominantly of Quaternary deposits) anticlines over independent fault segments of the Himalayan Frontal Thrust (HFT), Kangra re-entrant, were studied to deduce the timing and causes of the Beas-Satluj rivers deflections. The deposits, 4-60 m thick, were documented from the northwestern fringe of the JA (Site-1), between JA and BA (Site-2) and entire BA (Site-3), and along the present course of the Satluj River (Site-4) in the piggyback Soan Dun. They comprise quartzite-bearing gravels and multistorey sheet sand bodies with large-scale trough cross-stratification and are deposited by the Beas (Site-1) and Satluj (Sites 2-4) rivers. The deposits at Sites 1-3 are uplifted, tilted or folded, whereas, horizontally bedded at Site-4. Based on quartz Optically Stimulated Luminescence chrono-stratigraphy, the aggradation phase is bracketed between > 46.4 +/- 2.9 and 37.4 +/- 2.3 ka (Site-1), > 69.9 +/- 4.5 and 26.1 +/- 2.6 ka (Site-2) and > 55.2 +/- 1.7 and 50.3 +/- 3.5 ka (Site-3). The terrace deposits at Site-4 were formed around 26, 11 and 6 ka. The sedimentation (9.9 to 2.7 mm yr(-1) between 61.8 and 26 ka) and uplift (3.4 +/- 0.3 mm yr(-1) over a period of 44 ka) rates along HFT show that the latter exceeds the aggradation rate with time. It is envisaged that time variable tectonic movements along independent fault segments of the I-WT forced river deflection and termination of deposition at Sites 1-3, however, the absence of any forced aggradation at the Site-4 concomitant with Site-2 termination suggests it is also governed by climate.
机译：研究了沿康拉折返的喜马拉雅前冲断层（HFT）独立断层段沿Janauri（JA;包括Siwalik岩石）和Bhaddi（BA;主要为第四纪沉积）背斜的晚第四纪河流沉积物，以推论出时间和构造。 Beas-Satluj河流变形的原因。从JA（Site-1）的西北边缘，JA和BA（Site-2）之间以及整个BA（Site-3）之间以及沿Satluj的当前沿线记录到的沉积物厚度为4-60 m。背So式Soan Dun河（Site-4）。它们由含石英岩的砾石和多层板状砂体组成，它们具有大范围的槽交叉分层，并沉积在比斯河（Site-1）和萨特鲁日（Siteluj）（Site 2-4）河中。站点1-3处的沉积物被抬升，倾斜或折叠，而在站点4处水平沉积。基于石英光激发发光年代地层，凝结阶段在> 46.4 +/- 2.9和37.4 +/- 2.3 ka（Site-1），> 69.9 +/- 4.5和26.1 +/- 2.6 ka（站点-2）和> 55.2 +/- 1.7和50.3 +/- 3.5 ka（Site-3）。 Site-4的阶地沉积物形成于26、11和6 ka左右。沿HFT的沉积速率（在61.8和26 ka之间为9.9至2.7 mm yr（-1））和沿HFT的隆升速率（在44 ka期间为3.4 +/- 0.3 mm yr（-1））表明，后者超过了凝结速率随着时间的推移。可以设想，沿I-WT强迫河道偏转的独立断层段的时变构造运动以及站点1-3处沉积的终止，但是，站点4没有伴随站点2终止的强迫凝结表明它也受气候影响。

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