Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1177/0959683608095577 |
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
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ISSN | 0959-6836 |
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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