Sources and sinks of sediment to the Amazon margin: The Amapa coast |
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| Authors: | M A Allison C A Nittrouer L E C Faria Jr O M Silveira A C Mendes |
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| Institution: | (1) Marine Sciences Research Center, State University of New York, 11794-5000 Stony Brook, New York, USA;(2) PROMAR, Departamento de Geologia, Universidade Federal do Para, Av. Perimetral s/n, 66050 Belem-Para, Brazil;(3) Present address: Department of Oceanography, Texas A&M University, 5007 Avenue U, 77551 Galveston, Texas, USA |
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| Abstract: | Modern and Holocene muddy strata were studied along the shoreline adjacent to the Amazon river mouth using sedimentological, radiochemical, physical, and seismic methods. The present paper is a synthesis of the results, collected during the AmasSeds project, that is used to outline a regional shoreline sediment budget. Erosion of relict Amazon muds in southern Amapa supplies 106 tons yr–1 to the Amazon advective mud stream. Local rivers are sediment-poor (total suspended discharge ~ 1 × 106 tons yr–1), but form depositional sandflats on the shoreface downdrift of the river mouths. Mudflat accumulation in northern Amapa sequesters 106–107 tons yr–1 by tidal-flat aggradation, alongshore mudcape accretion, and sediment trapping by mangroves. The processes temporarily store 1.5 × 108 tons of Amazon mud in January–June. |
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