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Palaeohydrological reconstruction of Siwalik Group in Surai Khola section of west Nepal Himalaya

 

Prakash Das Ulak

Department of Geology, Tri–Chandra Campus,

Tribhuvan University, Kathmandu, Nepal

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Jour. Nep. Geol. Soc., Vol. 31, 2005, 33-42

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ABSTRACT

About 5 km thick Neogene Siwalik Group in the Surai Khola section of west Nepal comprises many fining-upward cycles, which are from several metres to tens of metres thick. However, the Siwalik sequence as a whole reveals a coarseningupward trend. The palaeohydrological reconstruction of the Siwalik Group was based mainly on two parameters: the sediment grain size and the thickness of individual fining-upward successions. The estimated palaeoflow velocity in the Siwalik Group varies from 0.32 to 4.76 m/s, palaeochannel gradient ranges from 5.29x10-5 to 9.59x10-4 m/m, and palaeodischarge fluctuates from 1 to 104 m3/s, in the stratigraphically upward direction. These palaeohydrological parameters indicate a gradual change in fluvial system, presumably owing to the southward propagation of thrusts.

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