globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.06.005
论文题名:
Estuarine Lago Mare fauna from the Tertiary Piedmont Basin indicates episodic Atlantic/Mediterranean exchange during the final stage of the Mediterranean Salinity Crisis
作者: Grunert P.; Harzhauser M.; Rosenthal Y.; Carnevale G.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 457
起始页码: 70
结束页码: 79
语种: 英语
英文关键词: Lago Mare ; Mediterranean ; Messinian ; Sr isotopes ; Stable isotopes ; Trace elements
英文摘要: The geochemical signature of fossils from Lago Mare deposits at Moncucco Torinese (NW Italy) indicates a temporary marine ingression into the Tertiary Piedmont Basin just before the Miocene/Pliocene boundary. Isotope (δ18O, δ13C, 87Sr/86Sr) and trace element (Sr/Ca, Ba/Ca) data from mollusk shells of multiple species and croaker otoliths indicate an upper estuarine environment with considerable seasonal variability in evaporation and freshwater input. Reconstructed salinities < 10 psu and low 87Sr/86Sr values indicate the close proximity of a watershed draining off of Mesozoic ophiolites and carbonates of the Alps and/or Apennines. Communication with an open marine environment is supported by otoliths of fully marine fishes such as lanternfishes, codlets, and slimeheads found in the same assemblage that carry a euhaline signature close to open ocean values. A thorough taphonomic evaluation renders reworking of the otoliths from pre-evaporitic deposits unlikely; instead we explain their presence in the Lago Mare assemblage as related to large predatory marine fish that periodically migrated into marginal marine and estuarine environments.The presence of a paralic paleobiotope with thalassogenic water in the Tertiary Piedmont Basin contradicts ideas of the Mediterranean as a brackish lake fed by the Paratethys during the latest stage of the Mediterranean Salinity Crisis. Instead, our data support previous notions of temporary Atlantic/Mediterranean exchange during sea-level highstands preceding the permanent re-connection at the Miocene/Pliocene transition. The establishment of short-lived and disjunct estuarine and lagoonal environments such as in the Tertiary Piedmont Basin during marine ingressions also puts highly variable 87Sr/86Sr values and occurrences of shallow water benthic foraminifera in Lago Mare deposits of other Mediterranean basins into a new perspective. © 2016.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68364
Appears in Collections:过去全球变化的重建

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作者单位: Institute of Earth Sciences, University of Graz, NAWI Graz, Heinrichstrasse 26, Graz, Austria; Department of Earth and Planetary Sciences, Rutgers University, 610 Taylor Road, Piscataway, NJ, United States; Department of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ, United States; Geological-Paleontological Department, Natural History Museum Vienna, Burgring 7, Vienna, Austria; Dipartimento di Scienze della Terra, Università degli Studi Torino, Via Valperga Caluso 35, Torino, Italy

Recommended Citation:
Grunert P.,Harzhauser M.,Rosenthal Y.,et al. Estuarine Lago Mare fauna from the Tertiary Piedmont Basin indicates episodic Atlantic/Mediterranean exchange during the final stage of the Mediterranean Salinity Crisis[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,457
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