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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
arts and humanities
The last interglacial sea-level high stand on the southern Cape coastline of South Africa
Quaternary Research, Volume 73, No. 2, Year 2010
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Description
The continental margin of southern South Africa exhibits an array of emergent marginal marine sediments permitting the reconstruction of long-term eustatic sea-level changes. We report a suite of optical luminescence ages and supplementary amino acid racemization data, which provide paleosea-level index points for three sites on this coastline. Deposits in the Swartvlei and Groot Brak estuaries display tidal inlet facies overlain by shoreface or eolian facies. Contemporary facies relations suggest a probable high stand 6.0-8.5 m above modern sea level (amsl). At Cape Agulhas, evidence of a past sea-level high stand comprises a gravel beach (ca. 3.8 m amsl) and an overlying sandy shoreface facies (up to 7.5 m amsl). OSL ages between 138 ± 7 ka and 118 ± 7 ka confirm a last interglacial age for all marginal marine facies. The high stand was followed by a sea-level regression that was associated with the accumulation of eolian dunes dating to between 122 ± 7 ka and 113 ± 6 ka. These data provide the first rigorous numerical age constraints for last interglacial sea-level fluctuations in this region, revealing the timing and elevation of the last interglacial high stand to broadly mirror a number of other far-field locations. Crown Copyright © 2009.
Authors & Co-Authors
Andrew S. Carr, Andrew S.
United Kingdom, Leicester
University of Leicester
Bateman, Mark D.
United Kingdom, Sheffield
The University of Sheffield
Roberts, David L.
South Africa, Pretoria
Council for Geoscience
Murray-Wallace, Colin V.
Australia, Wollongong
University of Wollongong
Jacobs, Zenobia
Australia, Wollongong
University of Wollongong
Holmes, Peter J.
South Africa, Bloemfontein
University of the Free State
Statistics
Citations: 97
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1016/j.yqres.2009.08.006
ISSN:
00335894
e-ISSN:
10960287
Study Locations
South Africa