DOI: 10.1007/s00531-013-0871-y
论文题名: Late Pleistocene-Holocene morphosedimentary architecture, Spiti River, arid higher Himalaya
作者: Srivastava P. ; Ray Y. ; Phartiyal B. ; Sharma A.
刊名: International Journal of Earth Sciences
出版年: 2013
卷: 102, 期: 7 起始页码: 1967
结束页码: 1984
语种: 英语
英文关键词: Arid NW Himalaya
; Fluvial archive
; OSL dating
; Paleoclimate
; Spiti River
Scopus关键词: bedrock
; fluvial deposit
; fluviolacustrine deposit
; Last Glacial Maximum
; lithofacies
; luminescence dating
; paleoclimate
; Pleistocene-Holocene boundary
; river bed
; sedimentary sequence
; Himalayas
英文摘要: The Spiti River drains the rain shadow zone of western Himalaya. In the present study, the fluvial sedimentary record of Spiti valley was studied to understand its responses to tectonics and climate. Geomorphic changes along the river enable to divide the river into two segments: (i) upper valley with a broad, braided channel where relict sedimentary sequences rise 15-50 m high from the riverbed and (ii) lower valley with a narrow, meandering channel that incises into bedrock, and here, the fluvio-lacustrine sediments reside on a bedrock bench located above the riverbed. The transition between these geomorphic segments lies along the river between Seko-Nasung and Lingti villages (within Tethyan Himalaya). Lithofacies analyses of the sedimentary sequences show six different lithofacies. These can be grouped into three facies associations, viz. (A) a glacial outwash; (B) sedimentation in a channel and in an accreting bar under braided conditions; and (C) formation of lake due to channel blockage by landslide activities. Seventeen optically stimulated luminescence ages derived from ten sections bracketed the phases of river valley aggradation between 14-8 and 50-30 ka. These aggradation phases witnessed mass wasting, channel damming and lake formation events. Our record, when compared with SW monsoon archives, suggests that the aggradation occurred during intensified monsoon phase of MIS 3/4 and that proceeded the Last Glacial Maxima. Thus, the study reports monsoon modulated valley aggradation in the NW arid Himalaya. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884416724&doi=10.1007%2fs00531-013-0871-y&partnerID=40&md5=5447968cd4515666d8d44c92053824fd
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70516
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, 248001, India; Birbal Sahni Institute of Palaeobotany, 53-University Road, Lucknow, 226007, India
Recommended Citation:
Srivastava P.,Ray Y.,Phartiyal B.,et al. Late Pleistocene-Holocene morphosedimentary architecture, Spiti River, arid higher Himalaya[J]. International Journal of Earth Sciences,2013-01-01,102(7)