DOI: 10.1016/j.quascirev.2018.02.001
Scopus记录号: 2-s2.0-85042193395
论文题名: Late Pleistocene - Holocene development of the Tista megafan (West Bengal, India): 10Be cosmogenic and IRSL age constraints
作者: Abrahami R. ; Huyghe P. ; van der Beek P. ; Lowick S. ; Carcaillet J. ; Chakraborty T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 185 起始页码: 69
结束页码: 90
语种: 英语
英文关键词: Climate
; Cosmogenic isotopes (10Be)
; Eastern Asia (Himalaya)
; Incision
; Late Pleistocene-Holocene
; Luminescence dating (IRSL)
; Megafan
; Monsoon
; Terrace
; Tista river
Scopus关键词: Atmospheric thermodynamics
; Catchments
; Deposition
; Luminescence
; Sediments
; Tectonics
; Climate
; Cosmogenic isotopes
; Himalayas
; Incision
; Late Pleistocene-Holocene
; Luminescence dating
; Megafan
; Monsoon
; Terrace
; Rivers
; age determination
; aggradation
; alluvial fan
; beryllium isotope
; cosmogenic radionuclide
; deposition
; drainage
; Holocene
; luminescence dating
; monsoon
; paleoclimate
; Pleistocene
; sediment transport
; terrace
; Bangladesh
; Brahmaputra River
; Far East
; Ganges River
; Himalayas
; India
; Jamuna River
; Sikkim Himalayas
; Teesta River
; West Bengal
英文摘要: The Himalayan proximal foreland is characterized by Quaternary megafans, of which the formational mechanisms remain debated. The Tista megafan spreads over more than 16,000 km2 from the mountain front, where it is strongly incised, to the confluence of the Tista River with the Jamuna/Brahmaputra River, and stores sediments produced in the Sikkim Himalaya. We propose a scenario for the late Pleistocene - Holocene development of the Tista megafan based on new 10Be cosmogenic and Infra-Red Stimulated Luminescence (IRSL) age constraints, and discuss the main potential controls on its evolution. We suggest that two distal lobes developed successively downstream from a common proximal lobe. Deposition in the proximal lobe took place since at least ∼135 ka and incision began at 3.7−0.7 +1.0 ka. The western distal lobe of the megafan was deposited early in the history of the megafan, when the Sikkim Himalaya catchment was drained by a tributary of the Ganga River, and was abandoned in the early Holocene (10–11 ka). The eastern, recent (<1 ka), and little incised lobe was built after the main Tista drainage system shifted eastward through nodal avulsions and can be considered still active. Approximately synchronous incision between terraces in the hinterland and megafan surfaces suggests that incision propagated rapidly through the system. Our data do not evidence a direct link between incicion and tectonic processes. Aggradation and incision episodes appear more compatible with a climatic control, through changes in monsoon intensity and associated sediment flux. Depositional episodes in the Tista megafan, as elsewhere in the Himalaya and its foreland, appear to correlate with periods of strong monsoon precipitation and associated high sediment flux toward the foreland. Abandonment and incision of megafan surfaces and hinterland terraces appear associated to both the onset and the ending of phases of strong monsoon precipitation, during which the balance between water and sediment discharge changes rapidly. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112266
Appears in Collections: 气候减缓与适应
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作者单位: Université Grenoble Alpes, Institut des Sciences de la Terre (ISTerre), CS 40700, Grenoble Cedex, 38058, France; University of Bern, Institut für Geologie, Baltzerstrasse 1+3, Bern, CH-3012, Switzerland; Indian Statistical Institute, Geological Studies Group, 203 Barrackpore Trunk Road, Kolkata, 700108, India
Recommended Citation:
Abrahami R.,Huyghe P.,van der Beek P.,et al. Late Pleistocene - Holocene development of the Tista megafan (West Bengal, India): 10Be cosmogenic and IRSL age constraints[J]. Quaternary Science Reviews,2018-01-01,185