干旱区生态环境知识资源中心(Arid): Palaeoenvironmental reconstruction of Kathu Pan, South Africa, based on sedimentological data

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DOI	10.1016/j.quascirev.2019.106153
	Palaeoenvironmental reconstruction of Kathu Pan, South Africa, based on sedimentological data
	Lukich, Vasilija 1; Cowling, Sharon 1; Chazan, Michael 2,3
通讯作者	Lukich, Vasilija
来源期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
出版年	2020
卷号	230
英文摘要	Several studies have highlighted the importance of collecting well-dated records of palaeoenvironmental changes on desert margins, particularly in the semi-arid interior of southern Africa. Here we describe sediments at three sites in Kathu Pan, a pan complex overlying karstic bedrock at the southern edge of the Kalahari Basin. Sinkholes have exposed sedimentary sequences dating back to the Pleistocene, making it possible to document multiple palaeoenvironmental regimes in this landscape. Using a multi analytical sedimentological approach, including micromorphology, energy dispersive X-ray spectrometry, electron microprobe, loss-on-ignition, laser diffractometry and luminescence dating, we demonstrate that the sediments at Kathu Pan represent an environment fluctuating among a number of thresholds for accumulation of different kinds of transported and authigenic sediments. Within the Pleistocene sands at the base of our studied sedimentary sequence, the presence of palygorskite, indicative of less extreme evaporative control, represents a semi-arid environment from 156 +/- 11 ka to 32 +/- 2 ka (Marine Isotope Stages 6-3). Increased moisture availability at 84 +/- 4 ka and at 96 +/- 5 ka (possibly during Marine Isotope Stages 5a and 5c, respectively) is reflected in the sands by the formation of palygorskite in concert with the deposition and oxidation of organic material. As the climate became increasingly arid, possibly in response to global cooling during the Last Glacial Maximum (21 +/- 2 ka), Kathu Pan crossed a threshold, and deposition of CaCO3 dominated over that of palygorskite. In the Holocene beds within our studied unit, alternating CaCO3- and organic-dominated deposits, sometimes in very fine laminae, reflect an increase in the amplitude of either seasonal or annual changes in water availability. (C) 2020 Elsevier Ltd. All rights reserved.
英文关键词	Pleistocene Holocene Sedimentology Paleoenvironments South Africa Optical methods Micromorphology Sediment mineralogy Archaeology
类型	Article
语种	英语
国家	Canada ; South Africa
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000514754000007
WOS关键词	GRAIN-SIZE DISTRIBUTION ; KALAHARI GROUP SEDIMENTS ; SOUTHWESTERN KALAHARI ; LATE PLEISTOCENE ; WONDERWERK CAVE ; PEDOGENIC PALYGORSKITE ; DUNE ACCUMULATION ; CLIMATE-CHANGE ; CLAY-MINERALS ; LAKE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315388
作者单位	1.Univ Toronto, Dept Earth Sci, 22 Russell St, Toronto, ON M5S 3B1, Canada; 2.Univ Toronto, Dept Anthropol, 19 Russell St, Toronto, ON M5S 2S2, Canada; 3.Univ Witwatersrand, Evolutionary Studies Inst, 1 Jan Smuts Ave, ZA-2000 Johannesburg, South Africa
推荐引用方式 GB/T 7714	Lukich, Vasilija,Cowling, Sharon,Chazan, Michael. Palaeoenvironmental reconstruction of Kathu Pan, South Africa, based on sedimentological data[J],2020,230.
APA	Lukich, Vasilija,Cowling, Sharon,&Chazan, Michael.(2020).Palaeoenvironmental reconstruction of Kathu Pan, South Africa, based on sedimentological data.QUATERNARY SCIENCE REVIEWS,230.
MLA	Lukich, Vasilija,et al."Palaeoenvironmental reconstruction of Kathu Pan, South Africa, based on sedimentological data".QUATERNARY SCIENCE REVIEWS 230(2020).