globalchange  > 气候减缓与适应
DOI: 10.1016/j.quascirev.2017.12.002
Scopus记录号: 2-s2.0-85038214162
论文题名:
Depositional and sea-level history from MIS 6 (Termination II) to MIS 3 on the southern continental shelf of South Africa
作者: Cawthra H.C.; Jacobs Z.; Compton J.S.; Fisher E.C.; Karkanas P.; Marean C.W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 181
起始页码: 156
结束页码: 172
语种: 英语
Scopus关键词: Deposits ; Geology ; Luminescence ; Sea level ; Sedimentology ; Stratigraphy ; Continental shelves ; Depositional environment ; Initial depositions ; Marine isotope stages ; Optically stimulated luminescence ; Sea-level fluctuations ; Sediment deposition ; Sedimentary facies ; Deposition ; continental shelf ; depositional environment ; eolian deposit ; facies ; marine isotope stage ; meltwater ; midlatitude environment ; Pleistocene ; sea level change ; shoreline ; water depth ; Mossel Bay ; South Africa ; Western Cape
英文摘要: Pleistocene shoreline deposits comprised of calcified shallow marine (palaeobeach) and aeolian (palaeodune) facies found along mid-latitude coastlines can be useful indicators of past sea levels. Here, we describe a succession of such deposits that are presently exposed both above (subaerial) and below (submerged) mean sea level along the southern Cape coast of South Africa, 18 km east of the town of Mossel Bay. The submerged units provide a window on Late Pleistocene coastal processes, as palaeoshoreline deposits in this study extend to water depths of up to 55 m on the mid-shelf. Five sedimentary facies were identified in the strata and were compared to modern depositional environments of the local littoral zone, which include aeolian dune, upper shoreface, foreshore, intertidal swash and back-barrier settings. Twenty-two geological units were observed and mapped. Some of these units were directly dated with optically stimulated luminescence (OSL) dating. OSL ages were obtained for ten samples from the subaerial and twelve samples from the submerged deposits. Those geological units not directly dated were interpreted based on sedimentology and field/stratigraphic relationships to dated units. The stratigraphy and chronology of the succession indicates a record of initial deposition during Termination II (T-II) meltwater events, preceding and leading to marine isotope stage (MIS) 5e. Indicators for multiple sea-level fluctuations between MIS 5d and MIS 4, and sediment deposition at the end of MIS 4 and start of MIS 3 are also found. Both regressive and transgressive depositional cycles are well-preserved in the succession. We propose that palaeodune and palaeobeach deposits along the South Coast of South Africa have no clear preference for deposition during sea-level transgressions or regressions. Sediment deposition more closely mirrors the rate of sea level change, with deposition and preservation either during times of rapid sea-level movement, or oscillation around still-stand events. Periods of relatively slow average rise or fall of sea level are represented by erosional planation surfaces in this record. © 2017 Elsevier Ltd
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112315
Appears in Collections:气候减缓与适应

Files in This Item:

There are no files associated with this item.


作者单位: Marine Geoscience Unit, Council for Geoscience, PO Box 572, Bellville, 7535, South Africa; Centre for Coastal Palaeoscience, Nelson Mandela University, Port Elizabeth, Eastern Cape 6031, South Africa; ARC Centre of Excellence for Australian Biodiversity and Heritage, Centre for Archaeological Science, School of Earth and Environmental Sciences, University of WollongongNew South Wales 2522, Australia; Department of Geological Sciences, University of Cape Town, University Avenue, Rondebosch, 7700, South Africa; Institute of Human Origins, School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85287-2402, United States; Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, WITS, Johannesburg, 2050, South Africa; Malcolm H. Wiener Laboratory for Archaeological Science, American School of Classical Studies, Souidias 54, Athens, 10676, Greece

Recommended Citation:
Cawthra H.C.,Jacobs Z.,Compton J.S.,et al. Depositional and sea-level history from MIS 6 (Termination II) to MIS 3 on the southern continental shelf of South Africa[J]. Quaternary Science Reviews,2018-01-01,181
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Cawthra H.C.]'s Articles
[Jacobs Z.]'s Articles
[Compton J.S.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Cawthra H.C.]'s Articles
[Jacobs Z.]'s Articles
[Compton J.S.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Cawthra H.C.]‘s Articles
[Jacobs Z.]‘s Articles
[Compton J.S.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.