Causes of pulsating evolution of fluvial landforms since the marine isotopic stage-2 in the belt of Schuppen, Nagaland, NE India

IF 1.1 4区地球科学 Q4 ENVIRONMENTAL SCIENCES

Physical Geography Pub Date : 2022-04-19 DOI:10.1080/02723646.2022.2064065

W. Imsong, G. T. Thong, Shubhra Sharma

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引用次数: 1

Abstract

ABSTRACT The Belt of Schuppen (BoS) of Nagaland is a NE-SW trending linear zone lying adjacent to the Brahmaputra Valley of Assam in Northeast India. Geomorphic, stratigraphic and chronologic data from the Dzüdza and Chathe river valleys that cut across the BoS have been studied to understand the influence of climate on landform evolution in parts of the BoS. Fluvial landforms in the Dzüdza and Chathe river valleys evolved in four major phases bracketed between 22–17 ka (Phase IV), 13–9.0 ka (Phase III), 7–5 ka (Phase II) and 3.5–1.5 ka (Phase I), indicating multi-centennial to millennial changes in monsoon intensity. Climatically, Phase-III was dominated by valley aggradation initiated by onset of the Indian Summer Monsoon (ISM) and persisted intermittently till the early Holocene-strengthened ISM. The other phases of aggradation are attributed to transient or weak ISM. The present study suggests that fluvial aggradation was associated with enhanced precipitation and sediment supply in the BoS valley, whereas the transient and weak ISM is manifested in episodic pulses of alluvial ingression from the tributaries to the trunk valleys; along with post depositional tectonic modifications of the landforms.

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印度东北部那加兰邦Schuppen带海相同位素2期以来河流地貌脉动演化成因

那加兰邦的舒本带(BoS)是一条NE-SW走向的线状带，位于印度东北部阿萨姆邦的布拉马普特拉河谷附近。为了了解气候对青藏高原部分地区地貌演化的影响，研究了穿越青藏高原的dz dza和Chathe河谷的地貌、地层和年代学资料。dzdza和Chathe流域的河流地貌经历了22-17 ka(第4阶段)、13-9.0 ka(第3阶段)、7-5 ka(第2阶段)和3.5-1.5 ka(第1阶段)4个主要阶段，反映了季风强度的百年至千年变化。气候上，第三阶段以印度夏季风(ISM)爆发引发的山谷沉积为主，并间歇性持续到全新世早期强化的印度夏季风。其他阶段的淤积归因于瞬态或弱ISM。研究表明，河流淤积与渤西河谷的降水和输沙量增加有关，而短暂的弱ISM则表现为从支流向干流河谷的间歇冲积;伴随着沉积后地貌的构造改造。

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来源期刊

Physical Geography 地学-地球科学综合

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： Physical Geography disseminates significant research in the environmental sciences, including research that integrates environmental processes and human activities. It publishes original papers devoted to research in climatology, geomorphology, hydrology, biogeography, soil science, human-environment interactions, and research methods in physical geography, and welcomes original contributions on topics at the intersection of two or more of these categories.