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Title
Enormous Ganges-Brahmaputra sediment discharge during strengthened early Holocene monsoon
Author:
Goodbred, SL; Kuehl, SA;
Addresses:
SUNY Stony Brook, Marine Sci Res Ctr, Stony Brook, NY 11794 USA SUNY StonyBrook Stony Brook NY USA 11794 Ctr, Stony Brook, NY 11794 USA Virginia Inst Marine Sci, Coll William & Mary, Gloucester Point, VA 23062 USA Virginia Inst Marine Sci Gloucester Point VA USA 23062 oint, VA 23062 USA
Heading Title:
GEOLOGY
issue: 12, volume: 28, year: 2000,
pages: 1083 - 1086
SICI:
0091-7613(200012)28:12<1083:EGSDDS>2.0.ZU;2-S
Source:
ISI
Language:
ENG
Subject:
SEA-LEVEL RECORD; LATE PLEISTOCENE; RIVER SYSTEM; BENGAL; OCEAN; ENVIRONMENTS; HIGHSTAND; CLIMATE; SHELF; DELTA;
Keywords:
climate effects; deltaic sedimentation; river discharge; sediment budget; Ganges-Brahmaputra River;
Document Type:
Article
Nature:
Serial
Edition:
Physical, Chemical & Earth Sciences
Citations:
33
Reviewed:
Addresses for extracts:
Address: Goodbred, SL SUNY Stony Brook, Marine Sci Res Ctr, Stony Brook, NY 11794 USA SUNY Stony Brook Stony Brook NY USA 11794 rook, NY 11794 USA
Citation:
S.L. Goodbred and S.A. Kuehl, "Enormous Ganges-Brahmaputra sediment discharge during strengthened early Holocene monsoon", GEOLOGY, 28(12), 2000, pp. 1083-1086

Abstract

Rivers are the main source of terrigenous sediment delivered to continental margins and thus exert a major control on coastal evolution and sequence development. However, little is known about past changes in fluvial sediment loads despite the recognition of significant variation under changing climatic regimes. In this study we present the first quantified estimate of sediment discharge for a major river system under conditions of an intensified early Holocene monsoon. Development of the Ganges-Brahmaputra River deltabegan ca. 11 000 yr B.P., when rising sea level flooded the Bengal basin, thereby trapping most of the river's discharge on the inner margin. Chronostratigraphic data from these deltaic deposits are used to calculate the rates of sediment storage on the margin, which provide a minimum estimate of the river's past sediment load. Results reveal that similar to5 x 10(12) m(3) of sediment was stored in the Bengal basin from ca, 11 000 to 7000 yr B.P., which corresponds to a mean load of 2.3 x 10(9) t/yr. In comparison, modern sediment load of the Ganges-Brahmaputra is similar to1 x 109 t/yr, ranking it first among the world's rivers and underscoring the significance of a two-fold increase sustained over 4 k.y. Furthermore, the timing of immense discharge in the early Holocene strongly suggests its relation to a stronger than present southwest monsoon in South Asia. Similar patterns of high monsoon-related sediment discharge have been noted throughout the tropics and subtropics, suggesting a widespread fluviosedimentary response, the potential magnitude of which is show-cased by the Ganges-Brahmaputra system.

ASDD Area Sistemi Dipartimentali e Documentali, Bologna University, Review Catalogue
Document created on 24/04/19 at 17:49:29