DOI: 10.1016/j.quascirev.2014.12.004
Scopus记录号: 2-s2.0-84920972563
论文题名: Lateglacial/Holocene environmental changes in the mediterranean alps inferred from lacustrine sediments
作者: Brisset E. ; Guiter F. ; Miramont C. ; Revel M. ; Anthony E.J. ; Delhon C. ; Arnaud F. ; Malet E. ; de Beaulieu J.-L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 110 起始页码: 49
结束页码: 71
语种: 英语
英文关键词: 14C ages
; Cirque glaciers
; Holocene climatic optimum
; Lake sediment
; Lateglacial
; Mediterranean alps
; Pollen biostratigraphy
Scopus关键词: Biostratigraphy
; Catchments
; Glacial geology
; Lakes
; Sedimentation
; <sup>14</sup>C ages
; Holocenes
; Lake sediments
; Lateglacial
; Mediterranean alps
; Sediments
; biostratigraphy
; cirque
; climate forcing
; core analysis
; deglaciation
; facies
; glacier retreat
; Holocene
; lacustrine deposit
; late glacial
; Mediterranean environment
; paleoclimate
; terrigenous deposit
; Alps
英文摘要: This study investigates sediment cores from the Mediterranean alpine lakes located in upvalley cirques upper than 1700 metres a.s.l. using sedimentological, palynological and geomorphological studies, in order to document environmental changes following the last phase of glacier retreat. These results are considered in the framework of the deglaciation characterized from 16 sediment cores from high-altitude lakes and mires including 104 14C ages and geomorphological studies of the Mediterranean Alps. Considering each sediment core proxy as an independent observation, i.e., comparisons between 14C ages and palynostratigraphy, between 14C ages and lithostratigraphy, between palynostratigraphy and lithostratigraphy, these data are aimed at contributing to a better understanding of the timing of postglacial environmental changes. The 14C ages combined with pollen biostratigraphy indicate that the deglaciation of cirque catchments is dated between 14,500 and 13,000cal. BP, i.e., during the Lateglacial Interstadial (Greenland Interstadial-1e). The sixteen lacustrine and mire sediment records are systematically characterized by three units from bottom to top: organic-poor blue clay, beige to light-brown silty clay and organic rich dark brown gyttja lithotype. During the Younger Dryas, lakes located below 2300m a.s.l. were ice-free and their pollen record indicates steppe conditions. The sedimentary facies also informs on the timing of glacial-dominated processes. The onset of organic-rich gyttja is dated at 11,000cal. BP suggesting the last influence of cirque glaciers in these lakes at the beginning of the Holocene. The timing of the onset of this organic rich unit differs in sites (±2000 years) probably due to an altitudinal and exposure gradient of the glacial cirques. The presence of gyttja from 11,000cal. BP to Present indicates biogenic infilling lake for all the Holocene. Even though the literature have indicated rock glacier advances occurred during the Holocene (Subboreal and LIA) in the south of the Alps, no significant sedimentological patterns related to glacier fluctuations are recorded in Lake Vens. The glacier fluctuations in the Mediterranean Alps are concomitant with those dated in the non-Mediterranean Alps, thus suggesting a main common climate forcing. However, the increase in terrigenous sediment inputs since 1800cal. BP is mainly due to human activities. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60030
Appears in Collections: 过去全球变化的重建
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作者单位: Aix-Marseille Université, CNRS, IRD, Collège de France, UM 34 CEREGE, EuropÔle Méditerranéen de l'Arbois, BP 80, Aix-en-Provence Cedex 4, France; Aix-Marseille Université, CNRS, UMR 7263 IMBE, EuropÔle Méditerranéen de l'Arbois, BP 80, Aix-en-Provence Cedex 4, France; ECCOREV Research Federation, EuropÔle Méditerranéen de l'Arbois, BP 80, Aix-en-Provence Cedex 4, France; Université Nice Sophia Antipolis, CNRS, UMR 7329 GEOAZUR, 250 rue A. Einstein, Valbonne-Sophia Antipolis, France; Institut Universitaire de France, France; Université Nice Sophia Antipolis, CNRS, UMR 7264 CEPAM, Camp. Saint-Jean-d'Angély, 24 Av. des Diables Bleus, Nice Cedex 4, France; Université de Savoie, CNRS, UMR 5204 EDYTEM, PÔle Montagne Campus scientifique, le-Bourget-du-Lac Cedex, France
Recommended Citation:
Brisset E.,Guiter F.,Miramont C.,et al. Lateglacial/Holocene environmental changes in the mediterranean alps inferred from lacustrine sediments[J]. Quaternary Science Reviews,2015-01-01,110