Arid
DOI10.1016/j.revpalbo.2014.08.011
Palaeoclimate and palaeoenvironments in central Mediterranean during the last 1.6 Ma before the onset of the Messinian Salinity Crisis: A case study from the Northern Apennine foredeep basin
Bertini, Adele; Menichetti, Elena
通讯作者Bertini, Adele
来源期刊REVIEW OF PALAEOBOTANY AND PALYNOLOGY
ISSN0034-6667
EISSN1879-0615
出版年2015
卷号218页码:106-116
英文摘要

The palynological record from late Tortonian-early Messinian sediments of the Trave section (Central Italy) allows for a floristic, vegetational, and palaeoclimatic reconstruction between 7.61 and 6.33 Ma. The sedimentary succession includes 34 precession-controlled cycles expressed by marl and organic-rich/sapropel alternations. This rhythmicity, reflecting the enhanced influence of climate, is also recorded by the pollen content of both sapropels, dominated by subtropical to warm temperate angiosperm taxa, and marly limestones dominated by Pins and other Pinaceae saccatae. At the same time the overall percentage decreases throughout the section of Pinus and other Pinaceae saccatae, as well as the distality index values [Dinocysts/(Dinocysts + pollen)], reflect the hydrological response of the Mediterranean to the progressive decrease of the Atlantic inputs. The palynological record points out the successive steps of the reduction of Atlantic-Mediterranean exchanges, with persistent relatively stable marine conditions in the Mediterranean until 7.2 Ma, followed by a phase of restriction since 7 Ma which becomes more pronounced at 6.7 Ma. Between 7.61 to 633 Ma the palynological signature of climate supports prevalent subtropical to warm/temperate conditions with high humidity despite minor cooler episodes between ca 7.6 and 6.5 Ma. However, the major expansion of temperate broad-leaved deciduous taxa amongst thermophilous angiosperm taxa, could reflect a slight increase of seasonality in connection with the major shallowing of the Mediterranean gateway under a tectonic control, since 6.7 Ma. The comparison with available pollen records from both southern and western sites, where drier conditions and expanded herbaceous cover dominate, demonstrate latitudinal and longitudinal gradients within the Mediterranean area. However, neither in the moister Northern Apennines, nor in the drier southern Italian and Spanish settings, is the progression to the Messinian Salinity Crisis marked by dramatic changes towards more arid climate conditions and significant increase of C4-plants. Knowledge of the complex and composite vegetation and climate scenarios in the Mediterranean proves to be relevant for comprehensive reconstructions of the history of the Messinian salinity crisis onset. (C) 2014 Elsevier B.V. All rights reserved.


英文关键词Central Mediterranean Messinian salinity crisis onset Late Tortonian-early Messinian pre-evaporitic interval Vegetation Climate Palynology
类型Article
语种英语
国家Italy
收录类别SCI-E
WOS记录号WOS:000357232700008
WOS关键词MONTE-DEI-CORVI ; CALCAREOUS NANNOFOSSIL BIOSTRATIGRAPHY ; BOUNDARY STRATOTYPE SECTION ; POLARITY TIME-SCALE ; LATE MIOCENE ; INTEGRATED STRATIGRAPHY ; LATE QUATERNARY ; PALEOCEANOGRAPHIC CONDITIONS ; BENTHIC FORAMINIFERA ; FANEROMENI SECTION
WOS类目Plant Sciences ; Paleontology
WOS研究方向Plant Sciences ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/190245
作者单位Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy
推荐引用方式
GB/T 7714
Bertini, Adele,Menichetti, Elena. Palaeoclimate and palaeoenvironments in central Mediterranean during the last 1.6 Ma before the onset of the Messinian Salinity Crisis: A case study from the Northern Apennine foredeep basin[J],2015,218:106-116.
APA Bertini, Adele,&Menichetti, Elena.(2015).Palaeoclimate and palaeoenvironments in central Mediterranean during the last 1.6 Ma before the onset of the Messinian Salinity Crisis: A case study from the Northern Apennine foredeep basin.REVIEW OF PALAEOBOTANY AND PALYNOLOGY,218,106-116.
MLA Bertini, Adele,et al."Palaeoclimate and palaeoenvironments in central Mediterranean during the last 1.6 Ma before the onset of the Messinian Salinity Crisis: A case study from the Northern Apennine foredeep basin".REVIEW OF PALAEOBOTANY AND PALYNOLOGY 218(2015):106-116.
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