SESS 0_retro e indice edi.pub Il Quaternario Italian Journal of Quaternary Sciences 24, (Abstract AIQUA, Roma 02/2011), Congresso AIQUA Il Quaternario Italiano: conoscenze e prospettive Roma 24 e 25 febbraio 2011 Ms. received: Testo ricevuto il MEDITERRANEAN SAPROPELS AND PLIO-PLEISTOCENE HIGH-LOW LATITUDES CONNECTIONS Florence Colleoni1, Simona Masina 1,2, Alessandra Negri 1,3 & Alice Marzocchi1 1 CMCC, BOLOGNA, 2 INGV BOLOGNA 3 Universita’ Politecnica delle Marche, Ancona Corresponding author: A. Negri ABSTRACT: Colleoni et al. Mediterranean sapropels and Plio-Pleistocene high-low latitudes connections. (IT ISSN 0384-3356, 2011) We present a comparison of the mediterranean stable isotopic planktic foraminifera record to analogous records in the Atlantic ocean in order to evidence the high-low latitude connections during the Plio-Pleistocene interval. RIASSUNTO: Colleoni et al., Sapropel del mediterraneo e connessione tra alte e bassse latitudini nel Plio-Pleistocene. (IT ISSN 0384-3356, 2011) Abbiamo confrontato uno studio del record isotopico dell’ossigeno ottenuto su foraminiferi planktonici nel mare mediter- raneo con record analoghi provenienti dall’oceano Atlantico per evidenziare le possibili connessioni climatiche tra alte e basse latitudini durante il Plio-Pleistocene.. Key words: Mediterranean sea , Sapropel, High-low latitude connections Parole chiave:Mare mediterraneo, Sapropel. Connessione alte-basse latitudini During the Late Pliocene, a gradual cooling of the global climate led to the onset of Northern Hemi- sphere Glaciations toward 3 Million years ago (Ma). Through external forcings and internal cli- mate feedbacks, the Mediterranean testifies of these large scale climate changes by means of rhythmic sediment, alternating marly limestone, marls and organic carbon rich sediments layers (sapropel). We consider the planktonic δ18O stack of four Mediterranean cores (Medstack, LOURENS et al., 2004 ; WANG et al., 2010) spanning the en- tire Plio-Pleistocene period. The Medstack is fur- ther compared with four North Atlantic high lati- tudes benthic δ18O records and North Atlantic tropical benthic δ18O and aeolian dust flux records. The time-evolutive power spectrum of these time- series were performed on the orbital bands at 100 kyr, 41 kyr and 23 kyr. Results show that the cli- mate variability of the Mediterranean is tightly linked to that of the Tropical records prior the onset of Northern Hemisphere Glaciations, being dominated by pre- cession. After 3 Ma, all latitudes exhibit a similar variability with increasing power in the 41 kyr band, in both benthic and planktonic records. However, the Mediterranean seems to be still influenced by tropical climate dynamics which is in turn paced, after ~2.5 Ma, by high latitudes glacial/interglacial alternation. REFERENCES LOURENS L. J. (2004) - Revised tuning of Ocean Drilling Program Site 964 and KC01B (Mediterranean) and implications for the d18O, tephra, calcareous nannofos- sil, and geomagnetic reversal chronologies of the past 1.1 Myr. Paleoceanography 19, PA3010. WANG P., TIAN J. & LOURENS L. J. (2010) – Obscuring of long eccentricity cyclicity in Pleistocene oceanic carbon isotope records. Earth Planet. Sc. Lett. 290, 319-330. 207 January 13, 2011 13 gennaio 2011