globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.12.035
论文题名:
Late Pleistocene to Holocene evolution of the Emba Delta, Kazakhstan, and coastline of the north-eastern Caspian Sea: Sediment, ostracods, pollen and dinoflagellate cyst records
作者: Richards K.; Mudie P.; Rochon A.; Athersuch J.; Bolikhovskaya N.; Hoogendoorn R.; Verlinden V.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 468
起始页码: 427
结束页码: 452
语种: 英语
英文关键词: Caspian Sea ; Dinocysts ; Ostracods ; Palynology ; Pollen ; Stratigraphy
英文摘要: Six cores, each approximately 10 m long, of late Pleistocene to Holocene age were studied from the Emba Delta region in the north-eastern Caspian Sea. Radiocarbon dates provide ages within the range of 47,820 to 12,020 cal BP for the middle sections, and for post-1950 close to surface. The ages fall within Marine Isotope Stage (MIS) 3, MIS 2 and MIS 1 (with MIS 4 also inferred). Four lithological units are present, each separated by an erosional contact. Unit 4 is equated with MIS 4 and consists of over-consolidated, east-west trending aeolian sands deposited during the late Pleistocene Atelian lowstand. Unit 3 is equated with MIS 3 and is a low-energy, shallow open water or lagoonal deposit based on ostracod faunas. Pollen from mesophilic trees is common, confirming warm climatic conditions. Floristic elements such as Engelhardia and Carya were shared with East Asia. Frequent Taxodiaceae pollen occurs, derived from Glyptostrobus pensilis, a seasonal freshwater swamp tree, now found naturally only in isolated relict stands in East Asia. This suggests that the north-eastern Caspian region was a ‘refugium’ supporting Glyptostrobus swamp vegetation during MIS 3. There is no evidence to indicate that these are reworked occurrences. Unit 2 consists of early Khvalynian transgressive barrier sands and Unit 1 of shoreface sands and muds of Holocene age. The late Khvalynian highstand and the Last Glacial Maximum (LGM) record are eroded by the Mangyshlak unconformity after ca. 12,500 cal BP. The Holocene interval contains frequent foraminifera and dinoflagellate cysts (dinocysts) of restricted ‘marine’ affinity (e.g. Lingulodinium machaerophorum). The dinocysts Pterocysta cruciformis and Impagidinium inaequalis are found commonly in the Caspian Sea for the first time. Results are compared with palynological and ostracod assemblages in surface samples from the eastern Caspian Sea coastal region. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67980
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作者单位: KrA Stratigraphic Ltd., 116 Albert Drive, Deganwy, Conwy, United Kingdom; Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Amsterdam, Netherlands; Geological Survey Canada-Atlantic, Box 2008, Dartmouth, Canada; ISMER, Université du Québec à Rimouski, Rimouski, Canada; StrataData Ltd., 17 The Bothy, Ottershaw Park, Surrey, United Kingdom; Faculty of Geography, Lomonosov Moscow State University, Moscow, Russian Federation; Delft University of Technology, Delft, Netherlands; Deltares, Princetonlaan 6, Utrecht, Netherlands; Centrica Energy (E&P), Justice Mill Lane, Aberdeen, United Kingdom

Recommended Citation:
Richards K.,Mudie P.,Rochon A.,et al. Late Pleistocene to Holocene evolution of the Emba Delta, Kazakhstan, and coastline of the north-eastern Caspian Sea: Sediment, ostracods, pollen and dinoflagellate cyst records[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,468
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