Enormous Ganges-Brahmaputra sediment discharge during strengthened early Holocene monsoon

Research Article| December 01, 2000 Enormous Ganges-Brahmaputra sediment discharge during strengthened early Holocene monsoon Steven L. Goodbred, Jr; Steven L. Goodbred, Jr 1Marine Sciences Research Center, State University of New York, Stony Brook, New York 11794-5000, USA Search for other works by this author on: GSW Google Scholar Steven A. Kuehl Steven A. Kuehl 2Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, Virginia 23062, USA Search for other works by this author on: GSW Google Scholar Geology (2000) 28 (12): 1083–1086. https://doi.org/10.1130/0091-7613(2000)28<1083:EGSDDS>2.0.CO;2 Article history received: 22 May 2000 rev-recd: 25 Aug 2000 accepted: 06 Sep 2000 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Steven L. Goodbred, Steven A. Kuehl; Enormous Ganges-Brahmaputra sediment discharge during strengthened early Holocene monsoon. Geology 2000;; 28 (12): 1083–1086. doi: https://doi.org/10.1130/0091-7613(2000)28<1083:EGSDDS>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search 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 delta began ca. 11000 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 ∼5 × 1012 m3 of sediment was stored in the Bengal basin from ca. 11000 to 7000 yr B.P., which corresponds to a mean load of 2.3 × 109 t/yr. In comparison, modern sediment load of the Ganges-Brahmaputra is ∼1 × 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 showcased by the Ganges-Brahmaputra system. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.