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A multidisciplinary approach for reconstructing the stratigraphic framework of the last 40 ka in a bathial area of the eastern Tyrrhenian Sea.

Morabito S.1, Petrosino P.2, Milia A.1,Sprovieri M.3, Tamburrino S.1

 

1 Istituto per l'Ambiente Marino Costiero (IAMC)—CNR, Calata Porta di Massa, Interno Porto di Napoli 80, 80133 Napoli, Italy

2 Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Università degli Studi di Napoli Federico II, Largo San Marcellino 10, 80138 Napoli, Italy Affiliazione 2

3 Istituto per l'Ambiente Marino Costiero (IAMC)—CNR, Via del Mare 3, 91021 Campobello di Mazara (Tp), Italy

 

Global and Planetary Change 123 (A), 121-138, 2014

Doi: 10.1016/j.gloplacha.2014.10.005

 

Abstract


figureabs vetr

A detailed integrated stratigraphic framework for the last 40 ka in the eastern Tyrrhenian Sea (central Mediterranean) was obtained through quantitative analyses of planktonic foraminifera assemblages, tephrostratigraphical studies and δ18O measurements on the basinal CET1 cored succession. Relative abundance fluctuations in the planktonic foraminifera assemblages allowed the identification of nine known eco-biozones and several bioevents recognized in the Tyrrhenian area and that are useful for correlations between Mediterranean marine records. Compositional changes in the planktonic foraminifera assemblages together with variations in the oxygen isotope record allowed us to detect the major climatic global fluctuations and some of the minor events that occurred during the investigated time interval. A total of 12 visible tephra layers and cryptotephras have been recognized and correlated with their volcanic sources and/or with known explosive events of Campanian and Sicilian–Aeolian volcanoes. A stratigraphic relationship between foraminiferal and climatic events and tephra layers has been highlighted. For the first time ecostratigraphic and tephrostratigraphic methodswere combined to obtain a detailed integrated  stratigraphy for the last 40 ka in the Tyrrhenian area. The achieved stratigraphic framework provides a useful stratigraphic reference record for the investigated area.

 

 

Key-words: Late Quaternary, Ecostratigraphy, Tephrostratigraphy, Oxygen isotopes, Tyrrhenian Sea

 

 Legenda: Integrated stratigraphic record of CET1 core. The succession of tephra layers and eco-biozones recognized in the cored succession are reported on the left. Eco-biozones are correlated to (*) Greenland Stadials and Interstadials of the INTIMATE event stratigraphy (Blockley et al., 2012) and to (**) the Mangerud et al. (1974) intervals. Ages (cal ka BP) obtained for eco-biozone boundaries are also reported.Modeled ages for tephra layers are reported in Table 3. Climatic events are also highlighted by the G. ruber relative abundance fluctuations and by the δ18O record.