Open AccessPalaeohydrology of the Siwalik Group along the Bakiya Khola section, central Nepal Himalaya
Author(s) -
Prakash Das Ulak
Publication year - 2002
Publication title -
journal of nepal geological society
Language(s) - English
Resource type - Journals
ISSN - 2676-1378
DOI - 10.3126/jngs.v26i0.32082
Subject(s) - foreland basin , geology , sedimentary depositional environment , fluvial , paleontology , palaeochannel , structural basin , group (periodic table) , sinuosity , section (typography) , paleocurrent , sedimentary rock , pleistocene , main central thrust , geomorphology , geochemistry , tectonics , chemistry , business , organic chemistry , advertising
Middle Miocene to Early Pleistocene fluvial sediments of the Siwalik Group comprises many fining-upward cycles from several to tens of metres thick. It is a foreland basin sediment with a coarsening-upward succession as a whole. The palaeohydrology and evolution of the fluvial depositional system of the group in the Bakiya Khola section of central Nepal was established using the grain size analyses, sedimentary structures and thickness of fining-upward cycles. Stratigraphically from older to younger sequence, the velocity and channel gradient of the palaeofluvial system varies from 0.28 m/s to 3.3 m/s and 2.9x10-5 to 3.4x10-4 m/m, respectively. The progressive changes in palaeovelocity and palaeochannel gradient reflect the southward propagation of thrust activities in the Himalayan front.