DOI: 10.1016/j.palaeo.2015.01.013
论文题名: Late-quaternary geomorphic scenario due to changing depositional regimes in the tangtse valley, Trans-Himalaya, NW India
作者: Phartiyal B. ; Singh R. ; Kothyari G.C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 422 起始页码: 11
结束页码: 24
语种: 英语
英文关键词: Climate
; Geomorphology
; Ladakh
; Late quaternary
; Sediment
; Trans-himalaya
英文摘要: Records from the Tangtse Valley in the Trans-Himalaya reveal depositional history since 48ka, with fluvial aggradation followed by incision, lacustrine sediment fill, and later incision. Varied sedimentary architecture with fluvial episodes intervened by lacustrine pulses, flood events, colluvial and glacial activity are preserved. The valley is located west of the Pangong Tso/Bangong Co, one of the largest lakes in Tibet which has served as a spillway, flooding and damming the entire Tangtse Valley, resulting in the formation of a lake. Today Pangong Tso consists of five basins separated by shallow sills and is fed by snow melt. Documentation based on 14C and OSL chronologies of the sediment sections throughout the valley reveals evidence of a sixth basin of Pangong Tso toward west, occupying the present day Tangtse Valley between 9.6-5.1ka. This event coincides with periods of high lake levels in Tibet, China as well as intensified monsoon periods over the Indian subcontinent. A fluvial regime around 48ka and 30-21ka with comparatively arid conditions and dry phases interspersed by flooding is documented. The valley has been incised to depths of 40-50m in the upper part and to 130m in the lower part. The incision rate ranges from 0.3 to 1.2mmyr-1 in the upper part and reaches as high as 10.8mmyr-1 in the lower valley. Much of the incision took place between 22 and 9.6ka although repeated sediment fill-incision cycles in the valley from 30-22ka, 22-9.6ka, 9.6-5.1ka, 5.1ka, and even to present time were observed. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69017
Appears in Collections: 过去全球变化的重建
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作者单位: Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow, UP., India; Institute of Seismological Research, Gandhinagar, Gujarat, India
Recommended Citation:
Phartiyal B.,Singh R.,Kothyari G.C.. Late-quaternary geomorphic scenario due to changing depositional regimes in the tangtse valley, Trans-Himalaya, NW India[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,422