气候变化领域集成服务门户(CCPortal): Seismic stratigraphy of the inner to mid Agulhas bank; South Africa

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DOI	10.1016/j.quascirev.2019.105979
	Seismic stratigraphy of the inner to mid Agulhas bank; South Africa
	Cawthra H.C.; Frenzel P.; Hahn A.; Compton J.S.; Gander L.; Zabel M.
发表日期	2020
ISSN	0277-3791
卷号	235
英文摘要	The inner to mid continental shelf of the Agulhas Bank, which forms part of the Palaeo-Agulhas Plain, is scattered with Pleistocene deposits. Their wide lateral extension is the expression of a flat underlying substrate, availability of accommodation space, and depositional processes in response to glacio-eustatic sea-level change. We present seismic sub-bottom profiles up to 30 m deep, sediment cores up to 5 m in length and Pleistocene deposits that date back to Marine Isotope Stage (MIS) 7 from the inner to mid shelf between the Breede River in the West and Plettenberg Bay in the East. Radiocarbon and optically stimulated luminescence dates are integrated with microfossil analysis into a seismic stratigraphic model comprised of twenty Quaternary facies units within two depositional sequences bounded by shelf-wide unconformities. Sequence Boundary 1 (SB1) corresponds to the erosional unconformity with bedrock and SB2 to the MIS 2 glacial lowstand. Incised palaeo-river channels are associated with both sequence boundaries and cored deposits also mapped seismically from estuarine, lacustrine and fluvial systems are grouped to represent the lower floodplain. The most pervasive stratigraphic pattern in these shelf deposits is made up of the depositional sequence remnant of the Falling Stage Systems Tract (FSST) forced regression from MIS 5e–2. The other dominant stratigraphic group is the Transgressive Systems Tract (TST) associated with the Post-glacial Marine Transgression. The TST makes up an almost equal proportion of deposits in both sequences in the sedimentological record as the FSST, despite the shorter temporal span of the TST. A Wave Ravinement Surface marks the rise in sea level from the Last Glacial Maximum in a landward direction. © 2019 Elsevier Ltd
英文关键词	Continental shelf; Palaeo-Agulhas Plain; Pleistocene; Post-glacial Marine Transgression
语种	英语
scopus关键词	Glacial geology; Luminescence; Sea level; Seismology; Stratigraphy; Continental shelves; Depositional sequences; Marine isotope stages; Marine transgression; Optically stimulated luminescence; Palaeo-Agulhas Plain; Pleistocene; Transgressive systems tracts; Deposits; bedrock; continental shelf; depositional environment; Last Glacial Maximum; lowstand; marine isotope stage; microfossil; paleoenvironment; paleoseismicity; river channel; sediment core; sedimentary sequence; seismic stratigraphy; transgression; Agulhas Bank; Agulhas Plain; Breede River; Indian Ocean; Plettenberg Bay; South Africa; Western Cape
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151512
作者单位	Geophysics and Remote Sensing Unit, Council for Geoscience, PO Box 572, Bellville, 7535, South Africa; African Centre for Coastal Palaeoscience, Nelson Mandela University, Port Elizabeth, South Africa; Institute of Geosciences, Friedrich Schiller University of Jena, Germany; MARUM Centre for Marine Environmental Sciences, University of Bremen, Germany; Department of Geological Sciences, University of Cape Town, South Africa
推荐引用方式 GB/T 7714	Cawthra H.C.,Frenzel P.,Hahn A.,et al. Seismic stratigraphy of the inner to mid Agulhas bank; South Africa[J],2020,235.
APA	Cawthra H.C.,Frenzel P.,Hahn A.,Compton J.S.,Gander L.,&Zabel M..(2020).Seismic stratigraphy of the inner to mid Agulhas bank; South Africa.Quaternary Science Reviews,235.
MLA	Cawthra H.C.,et al."Seismic stratigraphy of the inner to mid Agulhas bank; South Africa".Quaternary Science Reviews 235(2020).