A model of alluvial megafan sedimentation: Ganga Megafan

Ganga Megafan is one of several megafans, developed in the northern and central part of the Ganga Plain, that formed during the middle Late Pleistocene under conditions of higher sediment-water discharge and higher regional slopes than today. Incision by the Ganga River exposes 15–30 m thick megafan...

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Bibliographic Details
Published in:Sedimentary geology 2001-11, Vol.144 (3), p.243-262, Article 243
Main Authors: Shukla, U.K., Singh, I.B., Sharma, M., Sharma, S.
Format: Article
Language:English
Subjects:
Fluvial deposit
Foreland basin
Freshwater
Ganga Plain
India, Ganga R
Megafan
Quaternary
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Summary:Ganga Megafan is one of several megafans, developed in the northern and central part of the Ganga Plain, that formed during the middle Late Pleistocene under conditions of higher sediment-water discharge and higher regional slopes than today. Incision by the Ganga River exposes 15–30 m thick megafan deposits in the valley walls and cliffs. Ganga Megafan deposits can be separated into four zones: Zone I — Gravelly braided streams; Zone II — Sandy braid plain; Zone III — Anastomosing channel plain; and Zone IV — Meandering channels with broad interfluve areas. Deposits of each zone show distinct facies associations. Palaeocurrents fan from SW to SE and E, while the grain size decreases from proximal to distal fan. At present, fan-building activity is highly subdued and is restricted only to the northernmost 5–10 km wide belt of Piedmont plain.
ISSN:0037-0738
1879-0968
DOI:10.1016/S0037-0738(01)00060-4