Late Quaternary climatic variations on the Latium and Campanian Margin of the Tyrrhenian Sea

Variazioni climatiche tardo quaternarie nel Margine Campano e Laziale, Mar Tirreno

Abstract

A multidisciplinary investigation was carried out on two cores, MC 82-12 (Palinuro intraslope basin) and ML 83-21 (Pontinia intraslope basin), recovered during a cruise carried out in 1983, in the eastern part of the Tyrrhenian Sea, funded by C.N.R. Quantitative analyses of planktonic foraminifers, along with oxygen and carbon stable isotopes analyses, and mineralogical and petrological studies on tephra layers allowed to recognize and date, by means of isotopic stratigraphy, the main climatic events of the Late Quaternary: the Last Glacial Maximum, the Younger Dryas event, as well as Termination IA and IB. The planktonic assemblages recognized in the two cores correlate well between them and with the oxygen isotopic signal, even if there are some discrepancies, related to oceanographic factors other than temperature influencing the foraminifers distribution.

Riassunto

Uno studio multidisciplinare è stato condotto su due carote sedimentarie, MC 82-12 (bacino di Palinuro) e ML 83-21 (bacino di Pontinia), recuperate durante una crociera del 1983, finanziata dal C.N.R., lungo il margine orientale del Mar Tirreno. Le analisi quantitative sui foraminiferi planctonici, unite alle analisi degli isotopi stabili dell’ossigeno e del carbonio e a studi mineralogici e petrografici di strati sabbiosi di origine vulcanica, hanno permesso di riconoscere e datare, per mezzo della stratigrafia isotopica, gli eventi climatici principali del Tardo Quaternario: l’ultimo massimo glaciale, l’eventoYounger Dryas, così come le due fasi della deglaciazione (Termination IA e IB). Le associazioni planctoniche riconosciute nelle due carote si correlano bene tra di loro e con le curve dell’ossigeno, e le differenze esistenti sono da mettere in relazione, oltre che alla temperatura, ad altri fattori oceanografici, come la salinità, che influenzano la distribuzione dei foraminiferi.

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Correspondence to Judith A. McKenzie.

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Pervenuta in forma definitiva all’Accademia il 4 novembre 1998.

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McKenzie, J.A., Sbaffi, L., Wezel, F.C. et al. Late Quaternary climatic variations on the Latium and Campanian Margin of the Tyrrhenian Sea. Rend. Fis. Acc. Lincei 9, 293–313 (1998). https://doi.org/10.1007/BF02904440

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Key words

  • Tyrrhenian Sea
  • Planktonic foraminifers
  • Oxygen stable isotopes
  • Late Quaternary