Cyclochronology of the Eocene-Oligocene transition from the

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TitleCyclochronology of the Eocene-Oligocene transition from the Cape Roberts Project-3 core, Victoria Land basin, AntarcticaAbstractAbout 34 million years ago, at the Eocene-Oligocene (E-O) transition, EarthÅ› climate underwent a substantial change from relatively ice-free gÌreen house Ìconditions to a glacial state marked by the establishment of a permanent ice sheet on Antarctica. Our understanding of the Antarctic cryospheric evolution across the E-O climate transition relies on indirect marine geochemical proxies and, hitherto, it has not been possible to reconcile the pattern of inferred ice-sheet growth from these fÌar-field Ìproxy records with direct physical evidence of ice sheet behaviour from the proximal Antarctic continental margin. Here we present a correlation of cyclical changes recorded in the CRP-3 drill hole sediment core from the western Ross Sea, that are related to oscillations in the volume of a growing East Antarctic Ice Sheet, with well dated lower latitude records of orbital forcing and climate change across the E-O transition. We evaluate the results in the light of the age model available for the CRP-3A succession. Our cyclostratigraphy developed on the basis of repetitive vertical facies changes and clast peak abundances within sequences matches the floating cyclochronology developed in deep-sea successions for major glacial events. The astrochronological calibration of the CRP-3 succession represents the first high-resolution correlation of direct physical evidence of orbitally controlled glaciation from the Antarctic margin to geochemical records of paleoclimate changes across the E-O climate transition. â"' 2011 Elsevier B.V.AcknowledgementsThe Cape Roberts Project was made possible through the resources and close collaboration of the Antarctic programmes of Australia, Germany, Italy, New Zealand, The Netherlands, United Kingdom, and the United States of America. We thank all of our colleagues from the Cape Roberts Science Team and the people of McMurdo Station, Scott Base and Cape Roberts Camp for logistical support. Reviews by two anonymous reviewers and the Associate Editor Mike Bentley helped to improve the manuscript.

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1st AuthorGaleotti, S.AuthorGaleotti, S.Lanci, L.Florindo, F.Naish, T.Sagnotti, L.Sandroni, S.Talarico, F.Year2012JournalPalaeogeography, Palaeoclimatology, PalaeoecologyVolume335-336Pages84-94DOI10.1016/j.palaeo.2011.08.011URLhttps://www.scopus.com/inward/recor.....a6003a2e15ef6ecde7ef02cf2Keywordschronologyclimate variationcontinental margincryospherecyclostratigraphydeep seaEocene-Oligocene boundaryglaciationice sheetpaleoclimateproxy climate record, AntarcticaCape RobertsEast AntarcticaVictoria Land Basin, rank5Author KeywordsAntarcticaCRP-3 drill holeCyclostratigraphyEocene-Oligocene climate transition

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TypeArticleCitationGaleotti, S., Lanci, L., Florindo, F., Naish, T., Sagnotti, L., Sandroni, S. and Talarico, F. (2012). Cyclochronology of the Eocene-Oligocene transition from the Cape Roberts Project-3 core, Victoria Land basin, Antarctica. Palaeogeography, Palaeoclimatology, Palaeoecology, 335-336: 84-94 IdentifierGaleotti201284Relevancerank5

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Naish, T.