Sources and sinks of sediment to the Amazon margin: The Amapa coast

被引：13

作者：

Allison, MA

Nittrouer, CA

Faria, LEC

Mendes, AC

机构：

[1] SUNY STONY BROOK,MARINE SCI RES CTR,STONY BROOK,NY 11794

[2] UNIV FED PARA,DEPT GEOL,PROMAR,BR-66050 BELEM,PARA,BRAZIL

来源：

GEO-MARINE LETTERS | 1996年 / 16卷 / 01期

关键词：

D O I：

10.1007/BF01218836

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 10(6) tons yr(-1) to the Amazon advective mud stream. Local rivers are sediment-poor (total suspended discharge similar to 1 x 10(6) tons yr(-1)), but form depositional sandflats on the shoreface downdrift of the river mouths. Mudflat accumulation in northern Amapa sequesters 10(6)-10(7) tons yr(-1) by tidal-flat aggradation, alongshore mudcape accretion, and sediment trapping by mangroves. The processes temporarily store 1.5 x 10(8) tons of Amazon mud in January-June.

引用

页码：36 / 40

页数：5

共 19 条

[1]

ALLISON MA, 1994, J COASTAL RES, V10, P488

[2] RATES AND MECHANISMS OF SHOREFACE PROGRADATION AND RETREAT DOWNDRIFT OF THE AMAZON RIVER MOUTH [J].