Unroofing of the Himalayas; a view from apatite fission-track analysis of Bengal Fan sediments

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doi: 10.1029/92GL02743
Author(s): Corrigan, Jeff D.; Crowley, Kevin D.
Author Affiliation(s): Primary:
University of Texas at Austin, Department of Geological Sciences, Austin, TX, United States
Other:
Miami University, United States
Volume Title: Geophysical Research Letters
Source: Geophysical Research Letters, 19(23), p.2345-2348. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276 CODEN: GPRLAJ
Note: In English. 26 refs.; illus. incl. sketch map
Summary: 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 µm. These young ages and long track lengths indicate that rocks in the upper crust of Bengal Fan source areas cooled rapidly (≥15 °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. Copyright 1992 by the American Geophysical Union.
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 03 Geochronology; 06 Petrology, Sedimentary; Apatite; Asia; Bengal Fan; Cenozoic; Denudation; Fission-track dating; Geochronology; Himalayas; Indian Ocean; Leg 116; Lower Miocene; Miocene; Neogene; ODP Site 717; ODP Site 718; Ocean Drilling Program; Phosphates; Provenance; Quaternary; Sediment transport; Sedimentation; Tertiary; Turbidite
Coordinates: S010116 S005547 E0812404 E0812324
Record ID: 1993037952
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.