DOI: 10.1016/j.palaeo.2013.05.015
论文题名: A shallow water record of the onset of the Messinian salinity crisis in the Adriatic foredeep (Legnagnone section, Northern Apennines)
作者: Gennari R. ; Manzi V. ; Angeletti L. ; Bertini A. ; Biffi U. ; Ceregato A. ; Faranda C. ; Gliozzi E. ; Lugli S. ; Menichetti E. ; Rosso A. ; Roveri M. ; Taviani M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 386 起始页码: 145
结束页码: 164
语种: 英语
英文关键词: Integrated stratigraphy
; Messinian
; Multi-proxy palaeoenvironmental reconstruction
; Northern Apennine
; Palaeoceanography
; Palaeoclimate
英文摘要: The Legnagnone section (North-eastern Apennines) represents one of the few shallow water records of the onset of the Messinian salinity crisis. Here we present a detailed description of a ~200kyr time interval encompassing the pre-/syn-evaporitic transition based on a multidisciplinary approach, integrating sedimentological, bio-magnetostratigraphical, palaeontological and stable isotope data. Such a shallow water setting is potentially more sensitive to the palaeoenvironmental change leading to the MSC than the more often studied deeper Mediterranean basin. The aquatic palaeoenvironmental reconstruction proposed here is based on the study of foraminifer, ostracod and mollusc assemblages. It depicts a change from infralittoral (20-50m) to inner circalittoral environment (60-100m) that, since 6.12Ma, was progressively affected by a reduction of oxygen at the sea floor punctuated by short-lived anoxic events. At least three cooling events have been recognized on the basis of relative abundance data in mid to high altitude pollen, which, before 6.03Ma, are in phase with abundance peaks of Turborotalia spp., a taxon indicating eutrophic and cool surface waters. The absence of stress-tolerant benthic foraminifers during these peaks points to strong ventilation episodes triggered by a generally cooler climate. The proximity of a deltaic system and the consequent riverine input probably caused a salinity decrease of the surface waters, hindering the proliferation of planktonic foraminifers in the water column, which prevalently occur in short influxes and disappear at ca. 6Ma. Our results suggest that the onset of the crisis occurred during a phase of relative sea level high stand, whereas no evidences of sea level drop can be envisaged. The palaeoclimatic reconstruction based on palynological data indicates the dominance of a "subtropical humid forest" vegetation type, where fresh water swamps are well represented. From 6.03Ma onward, the transition to the salinity crisis is marked by more pronounced cyclical expansions of the temperate broad-leaved deciduous forest, along with herbaceous taxa. The establishment of the strongly evaporative condition at the crisis onset is not associated with major vegetational changes towards drier conditions, but linked to a sudden increase of δ18O and the disappearance of benthic foraminifers just prior to the deposition of the 1st laminated carbonate, which represents the base of the Primary Lower Gypsum unit. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69659
Appears in Collections: 过去全球变化的重建
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作者单位: Università degli Studi di Parma, V.le G.P. Usberti 157/A, 43100 Parma, Italy; ALP Laboratory, Via Madonna dei Boschi 76, 12016 Peveragno (CN), Italy; ISMAR-CNR, Via Gobetti 101, 40129 Bologna, Italy; Università degli Studi di Firenze, Via La Pira 4, 50121 Firenze, Italy; IGG-CNR, Sezione di Firenze, Via G. La Pira, 4, 50121 Firenze, Italy; ENI-AGIP, Via Emilia, 1, 20097 San Donato Milanese, Italy; Università Roma Tre, Largo S. Leonardo Murialdo, 1, I-00146, Roma, Italy; Università degli Studi di Modena e Reggio Emilia, Piazza S. Eufemia 19, 41100 Modena, Italy; Università di Catania, Corso Italia, 55, 95129, Catania, Italy
Recommended Citation:
Gennari R.,Manzi V.,Angeletti L.,et al. A shallow water record of the onset of the Messinian salinity crisis in the Adriatic foredeep (Legnagnone section, Northern Apennines)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,386