DOI: 10.1016/j.palaeo.2015.02.020
论文题名: Climatic signature of two mid-late Holocene fluvial incisions formed under sea-level highstand conditions (Pisa coastal plain, NW Tuscany, Italy)
作者: Sarti G. ; Rossi V. ; Amorosi A. ; Bini M. ; Giacomelli S. ; Pappalardo M. ; Ribecai C. ; Ribolini A. ; Sammartino I.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 424, 期: 1 起始页码: 183
结束页码: 195
语种: 英语
英文关键词: Channel incision
; Climate change
; Mid-late Holocene
; Pisa Plain
; Pollen
; Stratigraphic architecture
英文摘要: A multi-proxy (stratigraphic, geomorphological, palynological, geophysical) study of mid-late Holocene deltaic-alluvial deposits beneath the Pisa Plain (Tuscany, Italy) reveals short-term enhances of fluvial activity under relative sea-level highstand (HST) conditions (last ~7000 cal yr BP). Early HST delta progradation led to the progressive infill of a broad lagoon area (~5000 cal yr BP), followed by the development of a stable alluvial depositional environment (~4000 cal yr BP). The intense phase of alluvial aggradationwas punctuated by two events of enhanced fluvial incision that cut down to 10 m the underlying lagoonal substrate. The two erosive events,which reflect centennial-scale changes in the aggradation/degradation ratio, are chronologically constrained to the Eneolithic-Bronze age transition (~3800 cal yr BP) and to the Bronze-Iron age transition (2900-2800 cal yr BP), respectively. A detailed pollen profile highlights the correlation between these erosive events and two phases of increased humidity (Abies peaks 1 and 2) recorded in several sites of Europe. This correlation suggests a key-role of climate fluctuations in triggering channel incision. The peculiar high compressibility of the lagoonal substrate can also have acted as a factor able to foster the deepening of the channels. In contrast, the role of relative sea-level changes and human impact on the activation of the two erosive processes appears negligible. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69105
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Science, University of Pisa, Pisa, Italy; Department of Biological, Geological and Environmental Sciences, University of Bologna, Italy
Recommended Citation:
Sarti G.,Rossi V.,Amorosi A.,et al. Climatic signature of two mid-late Holocene fluvial incisions formed under sea-level highstand conditions (Pisa coastal plain, NW Tuscany, Italy)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,424(1)