Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2345c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 23, p. 2345-2348.
Physics
14
Fans (Landforms), Geochronology, Orography, Sediment Transport, Himalayas, Tertiary Period
Scientific paper
Apatite fission-track analysis of Early Miocene to Quaternary distal Bengal Fan sediments from ODP Leg 116 provides a unique perspective on denudation processes associated with the Tertiary Himalayan orogeny. These sediments yield pooled apatite fission-track ages that are 0- to 10-m.y. older than depositional ages. Mean track lengths range from 13.2 to 14.8 microns. These young ages and long track lengths indicate that rocks in the upper crust of Bengal Fan source areas cooled rapidly (equal to or more than 15 deg C/m.y.), implying denudation rates of several hundreds of meters per million years. These observations support the hypothesis that nearly continuous unroofing of a large source area, similar to the dimensions of the present Himalayan and southern Tibetan Plateau deformation front, and an efficient transport system, similar to the present Himalaya-Ganges-Brahmaputra system, supplied sediment to the Bengal Fan since the Early Miocene.
Corrigan Jeff D.
Crowley Kevin D.
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