Stepped Holocene sea-level rise and its influence on sedimentation in a large marine embayment: Maputo Bay, Mozambique

被引：23
|
作者：
De Lecea, A. M. [1 ]
Green, A. N. [1 ]
Strachan, K. L. [2 ]
Cooper, J. A. G. [1 ,3 ]
Wiles, E. A. [1 ]
机构：
[1] Univ KwaZulu Natal, Sch Agr Earth & Environm Sci, Geol Sci, Private Bag X54001, Westville, South Africa
[2] Univ KwaZulu Natal, Sch Agr Earth & Environm Sci, Geog, Private Bag X01, ZA-3209 Scottsville, South Africa
[3] Univ Ulster, Sch Environm Sci, Ctr Coastal & Marine Res, Cromore Rd, Coleraine BT52 1SA, Londonderry, North Ireland
来源：
ESTUARINE COASTAL AND SHELF SCIENCE | 2017年 / 193卷
关键词：
Holocene; Environmental changes; Stratigraphy; Shoreline progradation; Stepped sea-level rise; 8.2 ka event; STABLE-ISOTOPES; NORTH-CAROLINA; EVOLUTION; STRATIGRAPHY; FORAMINIFERA; ESTUARY; CARBON; ISLAND; PALEOENVIRONMENTS; PRESERVATION;
D O I：
10.1016/j.ecss.2017.05.015
中图分类号：
Q17 [水生生物学];
学科分类号：
071004 ;
摘要：
The sedimentary record in large marine embayments holds important information on Holocene environmental and sea-level changes. This paper investigates the evolution of a large subtropical marine embayment, Maputo Bay, in southern Mozambique. Using a combination of sediment cores, stable isotope data, seismic reflection profiling and C-14 dating, we show complex back-barrier changes during the Holocene and link these to stepped rises in sea level. Our data reveal a sea-level "slowstand" followed by an abrupt rise that we correlate with the 8.2 ka global rise in sea level. Sedimentological, isotope and seismic evidence point to a subsequent slowstand interspersed by two punctuated rises in sea level that formed clear tidal ravinement surfaces. Sedimentary changes in the embayment are primarily forced by sea-level change, whereby tidal ravinement surfaces sandwich normal regressive packages formed via marginal progradation and shallowing of the system during "slow-" or still-stands. Large marine embayment systems hold great potential in unravelling relative sea-level change. Axiomatically, this reduces their utility as archives of climate-change. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：25 / 36
页数：12
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