Arid
DOI10.1016/j.quascirev.2013.07.032
From the Allerod to the mid-Holocene: palynological evidence from the south basin of the Caspian Sea
Leroy, Suzanne A. G.1; Tudryn, Alina2,3; Chalie, Francoise4; Lopez-Merino, Lourdes1; Gasse, Francoise4
通讯作者Leroy, Suzanne A. G.
来源期刊QUATERNARY SCIENCE REVIEWS
ISSN0277-3791
出版年2013
卷号78页码:77-97
英文摘要

Pollen and dinoflagellate cysts have been analysed in a core from the south basin of the Caspian Sea, providing a picture of respectively past vegetation and water salinity for the Late Pleistocene to middle Holocene. A relatively sharp lithological change at 0.86 m depth reflects a shift from detrital silts to carbonates-rich fine silts. From this depth upwards, a Holocene chronology is built based on ten radiocarbon dates on ostracod shells and bulk carbonates.


From the vegetation point of view, the Late Pleistocene deserts and steppes were partially replaced in the most sheltered areas by an open woodland with Pinus, Juniperus-Hippophae-Elaeagnus and even Alnus-Quercus-Pterocarya and Fraxinus, related to the Allerod palynozone. This was interrupted by the Younger Dryas palynozone when Artemisia reaches a maximum in a first instance followed by a very dry phase with only a slight return of Pinus and Quercus and the rare presence of Ulmus-Zelkova. From 11.5 to 8.4 cal. ka BP, an open landscape dominated by shrubs such as Ephedra and progressively increasing Quercus appeared. The final spread of diverse evergreen and deciduous trees is delayed and occurs after 8.4 cal. ka BP. It is suggested that this delay is caused by an arid climate in the Early Holocene linked to high insolation and perhaps to a lake effect.


The dinocyst assemblages fluctuate between slightly brackish (Pyxidinopsis psilata and Spiniferites cruciformis, 7 psu and lower) and more brackish (Impagidinium caspienense, similar to 13 psu). In the Lateglacial (Khvalynian highstand), the assemblages remained dominated by relative low salinity taxa. A late and brief increase of salinity occurred prior to 11.2 cal. ka BP associated with the Mangyshlak lowstand. It is suggested that it was caused by a brief drop in meltwater flow from both the north and the southeast (Uzboy) and a likely evaporation increase. This lowstand occurs quasi at the same time as the end of a longer lowstand in the Black Sea. The freshest waters are then inferred as having occurred between 8.4 and <= 4.4 cal. ka BP, linked to a connection with the Amu Darya and the melting glaciers on the Pamir Mountains.


The Caspian Sea is a sensitive environment, easily perturbed by global climatic changes, such as the Allenod and Holocene warming, and the Lateglacial and Younger Dryas cooling, as well as by regional changes in its hydrography, such as shifts in the Eurasian meltwater and the Volga and Amu Darya inflows. (C) 2013 Published by Elsevier Ltd.


英文关键词Caspian Sea Pollen Dinocysts Vegetation Sea level fluctuations Palaeohydrography Younger Dryas Holocene
类型Article
语种英语
国家England ; France
收录类别SCI-E
WOS记录号WOS:000327908900006
WOS关键词BLACK-SEA ; LEVEL CHANGES ; ARAL SEA ; DINOFLAGELLATE CYSTS ; HOLOCENE VEGETATION ; SURFACE CONDITIONS ; POLLEN RECORD ; LONG-TERM ; HISTORY ; PLEISTOCENE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构French National Research Institute for Sustainable Development ; E17
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179643
作者单位1.Brunel Univ, Inst Environm, Uxbridge UB8 3PH, Middx, England;
2.Univ Paris Sud, Lab IDES, UMR8148, F-91405 Orsay, France;
3.CNRS, F-91405 Orsay, France;
4.Aix Marseille Univ, CNRS, CEREGE, IRD,UM 34,UMR 7330,UMR 161, F-13545 Aix En Provence 04, France
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GB/T 7714
Leroy, Suzanne A. G.,Tudryn, Alina,Chalie, Francoise,et al. From the Allerod to the mid-Holocene: palynological evidence from the south basin of the Caspian Sea[J]. French National Research Institute for Sustainable Development, E17,2013,78:77-97.
APA Leroy, Suzanne A. G.,Tudryn, Alina,Chalie, Francoise,Lopez-Merino, Lourdes,&Gasse, Francoise.(2013).From the Allerod to the mid-Holocene: palynological evidence from the south basin of the Caspian Sea.QUATERNARY SCIENCE REVIEWS,78,77-97.
MLA Leroy, Suzanne A. G.,et al."From the Allerod to the mid-Holocene: palynological evidence from the south basin of the Caspian Sea".QUATERNARY SCIENCE REVIEWS 78(2013):77-97.
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