Arid
DOI10.1177/0959683608095577
A Holocene-late Pleistocene aeolian record from lunette dunes of the western Free State panfield, South Africa
Holmes, Peter J.1; Bateman, Mark D.2; Thomas, David S. G.3,4; Telfer, Matt W.3; Barker, Charles H.1; Lawson, Martin P.5
通讯作者Holmes, Peter J.
来源期刊HOLOCENE
ISSN0959-6836
出版年2008
卷号18期号:8页码:1193-1205
英文摘要

The greatest concentration of pans in southern Africa occurs in the western Free State province, South Africa. A feature of many Free State pans is their fringing lunettes, located on the southern and southeastern margins. Lunette dunes associated with pans in the neighbouring and presently drier Kalahari region show depositional ages, determined by optically stimulated luminescence (OSL) dating, primarily in the Holocene. However, to date, the precise timing of Free State lunette accumulation has not been investigated. The morphology, sedimentology and age of lunettes at five pan sites in the western Free State panfield are reported here. The lunettes form distinct topographic features, with heights up to 5 m above the pan floor, and all have been dissected by gully erosion. Sediment in the sand size class dominates in the lunettes, often overlying clay-rich basal or pan floor sediments. The intra- and intersite data consistency of 46 OSL ages is interpreted as reflecting regional causal factors responsible for lunette accretion, with phases of lunette building at 12-10 ka, 5.5-3 ka, 2-1 ka and 0.3-0.07 ka ago. These are in good agreement with the findings from pan-fringing lunettes in the southwest Kalahari and consistent with established records of palaeocirculation and wind direction over central southern Africa during the late Pleistocene. Lunettes in the western Free State are currently not in a major accretion phase. They are subject to degradation by localized fluvial erosion, with sediment being recycled into the pans.


英文关键词Aeolian lunette dunes OSL dating pan sediment South Africa late Pleistocene Holocene
类型Article
语种英语
国家South Africa ; England
收录类别SCI-E
WOS记录号WOS:000261243200004
WOS关键词SOUTHWESTERN KALAHARI DESERT ; LUMINESCENCE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构University of Oxford
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/157591
作者单位1.Univ Orange Free State, Dept Geog, ZA-9300 Bloemfontein, South Africa;
2.Univ Sheffield, Dept Geog, Sheffield Ctr Int Drylands Res, Sheffield S10 2TN, S Yorkshire, England;
3.Univ Oxford, Oxford Univ Ctr Environm, Sch Geog, Oxford OX1 3QY, England;
4.Univ Cape Town, Dept Geog & Environm Sci, ZA-7700 Rondebosch, South Africa;
5.i level, London W1W 8BE, England
推荐引用方式
GB/T 7714
Holmes, Peter J.,Bateman, Mark D.,Thomas, David S. G.,et al. A Holocene-late Pleistocene aeolian record from lunette dunes of the western Free State panfield, South Africa[J]. University of Oxford,2008,18(8):1193-1205.
APA Holmes, Peter J.,Bateman, Mark D.,Thomas, David S. G.,Telfer, Matt W.,Barker, Charles H.,&Lawson, Martin P..(2008).A Holocene-late Pleistocene aeolian record from lunette dunes of the western Free State panfield, South Africa.HOLOCENE,18(8),1193-1205.
MLA Holmes, Peter J.,et al."A Holocene-late Pleistocene aeolian record from lunette dunes of the western Free State panfield, South Africa".HOLOCENE 18.8(2008):1193-1205.
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