2024-03-29T01:08:51Z
https://eprints.whiterose.ac.uk/cgi/oai2
oai:eprints.whiterose.ac.uk:1067
2014-06-06T08:23:24Z
7374617475733D707562
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756E69743D536865666669656C64:536865666669656C642E5F5243:536865666669656C642E494452
756E69743D536865666669656C64:536865666669656C642E464353:536865666669656C642E47454F
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7072696D6F3D6861735F7075626C6963
https://eprints.whiterose.ac.uk/1067/
Aeolianite and barrier dune construction spanning the last two glacial-interglacial cycles from the southern Cape coast, South Africa
Bateman, M.D.
Holmes, P.J.
Carr, A.S.
Horton, B.P.
Jaiswal, M.K.
The southern Cape region of South Africa has extensive coastal aeolianites and barrier dunes. Whilst previously reported, limited knowledge of their age has precluded an understanding of their relationship with the climatic and sea-level fluctuations that have taken place during the Late Quaternary. Sedimentological and geomorphological studies combined with an optical dating programme reveal aeolianite development and barrier dune construction spanning at least the last two glacial–interglacial cycles. Aeolianite deposition has occurred on the southern Cape coast at ca 67–80, 88–90, 104–128, 160–189 and >200 ka before the present. Using this and other published data coupled with a better understanding of Late Quaternary sea-level fluctuations and palaeocoastline configurations, it is concluded that these depositional phases appear to be controlled by interglacial and subsequent interstadial sea-level high stands. These marine transgressions and regressions allowed onshore carbonate-rich sediment movement and subsequent aeolian reworking to occur at similar points in the landscape on a number of occasions. The lack of carbonates in more recent dunes (Oxygen Isotope Stages 1/2 and 4/5) is attributed not to leaching but to changes to carbonate production in the sediment source area caused by increased terrigenous material and/or changes in the balance between the warm Agulhas and nutrient-rich Benguela ocean currents
2004-07
Article
PeerReviewed
text
en
https://eprints.whiterose.ac.uk/1067/1/Bateman_et_al_2004_author_version.pdf
Bateman, M.D., Holmes, P.J., Carr, A.S. et al. (2 more authors) (2004) Aeolianite and barrier dune construction spanning the last two glacial-interglacial cycles from the southern Cape coast, South Africa. Quaternary Science Reviews, 23 (14-15). pp. 1681-1698. ISSN 0277-3791
http://dx.doi.org/10.1016/j.quascirev.2004.02.001
doi:10.1016/j.quascirev.2004.02.001
oai:eprints.whiterose.ac.uk:1071
2014-06-07T01:22:50Z
7374617475733D707562
74797065733D61727469636C65
756E69743D536865666669656C64:536865666669656C642E5F5243:536865666669656C642E494452
756E69743D536865666669656C64:536865666669656C642E464353:536865666669656C642E47454F
696E737469747574696F6E3D536865666669656C64
7072696D6F3D6861735F7075626C6963
https://eprints.whiterose.ac.uk/1071/
Extending the aridity record of the Southwest Kalahari: current problems and future perspectives
Bateman, M.D.
Thomas, D.S.G.
Singhvi, A.K.
An extensive luminescence-based chronological framework has allowed the reconstruction of expansions and contractions of the Kalahari Desert over the last 50 ka. However, this chronology is largely based on near-surface pits and sediment exposures. These are the points on the landscape most prone to reactivation and resetting of the luminescence dating ‘clock’. This is proving to be a limiting feature for extending palaeoenvironmental reconstructions further back in time. One way to obviate this is to sample desert marginal areas that only become active during significant arid phases. An alternative is to find and sample deep stratigraphic exposures. The Mamatwan manganese mine at Hotazel in the SW Kalahari meets both these criteria. Luminescence dating of this site shows the upper sedimentary unit to span at least the last 60 ka with tentative age estimates from underlying cemented aeolian units dating back to the last interglacial and beyond. Results from Mamatwan are comparable to new and previously published data from linear dunes in the SW Kalahari but extend back much further. Analysis of the entire data set of luminescence ages for the SW Kalahari brings out important inferences that suggest that different aeolian forms (1) have been active over different time scales in the past, (2) have different sensitivities to environmental changes and (3) have different time scales over which they record and preserve the palaeoenvironmental record. This implies that future optically stimulated luminescence work and palaeoenvironmental reconstructions must consider both site location and its relationship to desert margins and sediment depositional styles, so that the resolution and duration of the aridity record can be optimally understood.
2003
Article
PeerReviewed
text
en
https://eprints.whiterose.ac.uk/1071/1/Bateman_et_al_2003_author_version__mamatwan.pdf
Bateman, M.D., Thomas, D.S.G. and Singhvi, A.K. (2003) Extending the aridity record of the Southwest Kalahari: current problems and future perspectives. Quaternary International, 111 (1). pp. 37-49. ISSN 1040-6182
http://dx.doi.org/10.1016/S1040-6182(03)00013-2
doi:10.1016/S1040-6182(03)00013-2
oai:eprints.whiterose.ac.uk:2258
2014-06-09T16:07:48Z
7374617475733D707562
74797065733D61727469636C65
756E69743D536865666669656C64:536865666669656C642E5F5243:536865666669656C642E494452
756E69743D536865666669656C64:536865666669656C642E464353:536865666669656C642E47454F
696E737469747574696F6E3D536865666669656C64
7072696D6F3D6861735F7075626C6963
https://eprints.whiterose.ac.uk/2258/
The chronostratigraphy of Late Pleistocene glacial and periglacial aeolian
activity in the Tuktoyaktuk Coastlands, NWT, Canada
Bateman, M.D.
Murton, J.B.
Aeolian periglacial sand deposits are common in the Tuktoyaktuk Coastlands of Western Arctic Canada. Regionally extensive and thick aeolian sand-sheet deposits have been observed in two major stratigraphic settings: within a sand unit characterized by large aeolian dune deposits; and interbedded with glaciofluvial outwash from the Laurentide Ice Sheet (LIS). Small, localized sand sheets have also been observed along the tops of sandy bluffs, within sequences of drained thermokarst lakes deposits and as an involuted veneer above buried basal ice of the LIS.
On the basis of radiocarbon and optically stimulated luminescence (OSL) dates from preserved periglacial aeolian sand sheets and dunes a regional chronostratigraphy is presented which indicates that both extensive dunes and sand sheets accumulated mainly between ca 30 and 13 ka. A switch to dominantly sand-sheet aggradation at ca 14–13 ka, with sand sheets forming widely until ca 8 ka, is attributed to (a) surface armouring by glacial deposits associated with the advance of the LIS; and (b) amelioration of the climate from cold aridity. An absence of OSL dates between ca 8 and 1 ka suggests that sand sheets stabilized during much of the Holocene. Local sand-sheet aggradation during recent centuries has occurred near sandy bluffs and on the floors of drained thermokarst lakes. The OSL dates constrain the maximum extent of the LIS in the Tuktoyaktuk Coastlands to Marine Isotope Stage 2.
Elsevier
2006-10
Article
PeerReviewed
text
en
https://eprints.whiterose.ac.uk/2258/1/Bateman_and_murton_author_version%5B1%5D.pdf
Bateman, M.D. and Murton, J.B. (2006) The chronostratigraphy of Late Pleistocene glacial and periglacial aeolian activity in the Tuktoyaktuk Coastlands, NWT, Canada. Quaternary Science Reviews, 25 (19-20). pp. 2552-2568. ISSN 0277-3791
http://dx.doi.org/10.1016/j.quascirev.2005.07.023
doi:10.1016/j.quascirev.2005.07.023
oai:eprints.whiterose.ac.uk:2264
2014-06-05T05:19:37Z
7374617475733D707562
74797065733D61727469636C65
756E69743D536865666669656C64:536865666669656C642E5F5243:536865666669656C642E494452
756E69743D536865666669656C64:536865666669656C642E464353:536865666669656C642E47454F
696E737469747574696F6E3D536865666669656C64
7072696D6F3D6861735F7075626C6963
https://eprints.whiterose.ac.uk/2264/
Preserving the palaeoenvironmental record in Drylands: Bioturbation
and its significance for luminescence-derived chronologies
Bateman, M.D.
Boulter, C.H.
Carr, A.S.
Frederick, C.D.
Peter, D.
Wilder, M.
Luminescence (OSL) dating has revolutionised the understanding of Late Pleistocene dryland activity. However,
one of the key assumptions for this sort of palaeoenvironmental work is that sedimentary sequences have been
preserved intact, enabling their use as proxy indicators of past changes. This relies on stabilisation or burial
soon after deposition and a mechanism to prevent any subsequent re-mobilisation. As well as a dating
technique OSL, especially at the single grain level, can be used to gain an insight into post-depositional
processes that may distort or invalidate the palaeoenvironmental record of geological sediment sequences.
This paper explores the possible impact of bioturbation (the movement of sediment by flora and fauna) on
luminescence derived chronologies from Quaternary sedimentary deposits in Texas and Florida (USA) which
have both independent radiocarbon chronologies and archaeological evidence. These sites clearly illustrate the
ability of bioturbation to rejuvenate ancient weathered sandy bedrock and/or to alter depositional stratigraphies
through the processes of exhumation and sub-surface mixing of sediment. The use of multiple OSL replicate
measurements is advocated as a strategy for checking for bioturbated sediment. Where significant OSL
heterogeneity is found, caution should be taken with the derived OSL ages and further measurements at the
single grain level are recommended. Observations from the linear dunes of the Kalahari show them to have no
bedding structure and to have OSL heterogeneity similar to that shown from the bioturbated Texan and Florida
sites. The Kalahari linear dunes could have therefore undergone hitherto undetected post-depositional sediment
disturbance which would have implications for the established OSL chronology for the region.
Elsevier
2007-02-15
Article
PeerReviewed
text
en
https://eprints.whiterose.ac.uk/2264/1/bateman_et_al_2006_author_version%5B1%5D.pdf
Bateman, M.D., Boulter, C.H., Carr, A.S. et al. (3 more authors) (2007) Preserving the palaeoenvironmental record in Drylands: Bioturbation and its significance for luminescence-derived chronologies. Sedimentary Geology, 195 (1-2). pp. 5-19. ISSN 0037-0738
http://dx.doi.org/10.1016/j.sedgeo.2006.07.003
doi:10.1016/j.sedgeo.2006.07.003