DOI: 10.1016/j.quascirev.2015.10.017
Scopus记录号: 2-s2.0-84944879276
论文题名: Chronology of late Quaternary glaciation and landform evolution in the upper Dhauliganga valley, (Trans Himalaya), Uttarakhand, India
作者: Bisht P. ; Ali S.N. ; Shukla A.D. ; Negi S. ; Sundriyal Y.P. ; Yadava M.G. ; Juyal N.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 129 起始页码: 147
结束页码: 162
语种: 英语
英文关键词: Dhauliganga valley
; Mid-latitude westerlies
; Outwash terraces
; Summer monsoon
; Trans Himalayan
Scopus关键词: Atmospheric thermodynamics
; Deposition
; Landforms
; Dhauliganga valley
; Midlatitudes
; Outwash terraces
; Summer monsoon
; Trans Himalayan
; Glacial geology
英文摘要: Detailed field mapping of glacial and paraglacial landforms supported by optical and radiocarbon dating is used to reconstruct the history of late Quaternary glaciation and landform evolution in the Trans Himalayan region of the upper Dhauliganga valley. The study identifies four events of glaciations with decreasing magnitude which are termed as Purvi Kamet Stage -Ia (PKS-Ia), PKS-Ib, PKS-II, PKS-III and PKS-IV respectively. The oldest PKS-Ia and Ib are assigned the Marine Isotopic Stgae-3 (MIS-3), the PKS-II to the Last Glacial Maximum (MIS-2), PKS-III dated to 7.9 ± 0.7 ka, and the PKS-IV is dated to 3.4 ± 0.3 ka and 1.9 ± 0.2 ka respectively. The largest valley glaciations viz. the (PKS-Ia) occurred during the strengthened summer monsoon corresponding to the MIS-3, following this, the recessional moraines (PKS-Ib) represent the gradual decline in summer monsoon towards the later part of MIS-3. The valley responded to the global Last Glacial Maximum (LGM), which is represented by the PKS-II moraine implying the influence of strengthened mid-latitude westerlies during the LGM. The post-LGM deglaciation was associated with the onset of summer monsoon and is represented by the deposition of four distinct outwash gravel terraces. The early Holocene PKS-III glaciation occurred around 7.9 ± 0.7 ka and broadly coincides with the early Holocene cooling event (8.2 ka). This was followed by the deposition of stratified scree deposits and the alluvial fan (between 5.5 ka and 3 ka) during the mid to late Holocene aridity. This was followed by marginal re-advancement of the valley glacier (viz. PKS-IV) during the late Holocene cool and moist climate. Although glaciers respond to a combination of temperature and precipitation changes, however during the Holocene it seems that temperature played a major role in driving the glaciation. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59763
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, HNB Garhwal University, Srinagar, Uttrakhand, India; Physical Research Laboratory, Navrangpura, Ahmedabad, India; Birbal Sahani Institute of Paleobotany, Lucknow, India
Recommended Citation:
Bisht P.,Ali S.N.,Shukla A.D.,et al. Chronology of late Quaternary glaciation and landform evolution in the upper Dhauliganga valley, (Trans Himalaya), Uttarakhand, India[J]. Quaternary Science Reviews,2015-01-01,129