georefid:2012-069529SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1016/j.palaeo.2011.04.0082012-01-01publicationgeorefid:2012-069529doi:10.1016/j.palaeo.2011.04.008Houben, Alexander J. P.Utrecht University, Biomarine Sciences, Utrecht, Netherlandsauthorvan Mourik, Caroline A.Istituto Nazionale di Geofisica e Vulcanologia, ItalyauthorMontanari, AlessandroDurham University, United KingdomauthorCoccioni, RodolfoUniversity of Massachusetts-Amherst, United StatesauthorBrinkhuis, HenkStockholm University, SwedenauthorElsevier, Amsterdam, NetherlandspublisherdocumentHardcopyIn: Escutia, Carlota (editor), Florindo, Fabio (editor), Bentley, Michael J. (editor), DeConto, Robert M. (editor), Cenozoic evolution of Antarctic climates, oceans and ice sheets335-33675-83The Eocene-Oligocene Transition (EOT approximately 34 Ma) reflects the onset of major Antarctic glaciation. The primary geochemical signature of the EOT is two approximately 300 kyr spaced shifts in increasing deep-sea oxygen isotope values, possibly reflecting both global cooling and/or increasing ice volume. A way to assess the respective contribution of continental ice is to quantify concomitant glacio-eustatic sea level change. This is usually expressed in relatively shallow marine depositional settings. One potentially suitable region is in the Vicentinian Alps, NE Italy, where marginal marine deposits document sea level changes during the EOT. By correlating stable isotope-, bio- and magnetostratigraphic information between three distant regions, we are able to relate the shallow marine sections to the Pacific oxygen isotope record from Ocean Drilling Program (ODP) Site 1218 of Coxall et al. (2005). Microfacies, sedimentological, and biotic analysis suggests that associated with the first isotope shift (EOT-1) sea level fell approximately 20 m, and with the ultimate shift, the Oligocene Isotope Event 1 (Oi-1) sea level fell some 50-60 m. Distribution patterns of temperature sensitive dinoflagellates from a coeval central Italian section reveal that the early stages of the EOT were accompanied by sea surface cooling, whereas no sustained cooling is noted in association with the Oi-1. This suggests that the initial EOT shift(s) reflect a mixed signal of ice volume and temperature whereas the Oi-1 primarily reflects expansion of the Antarctic cryosphere. Abstract Copyright (2012) Elsevier, B.V.completedStratigraphyAntarcticabiostratigraphycarbonate rocksCenozoicclastic rockscorrelationcryospheredepositional environmentDinoflagellataEast PacificEoceneEocene-Oligocene boundaryEquatorial PacificEuropeForaminiferageochemistryglacial environmentglaciomarine environmentInvertebrataisotope ratiosisotopesItalyLeg 199limestonelower OligocenemagnetostratigraphyMarches Italymarine environmentmarine sedimentsmarlmicrofaciesmicrofossilsNorth PacificNortheast PacificO-18/O-16Ocean Drilling ProgramODP Site 1218OligoceneoxygenPacific OceanpaleoclimatologypaleoecologyPaleogenepaleotemperaturepalynomorphsPriabona ItalyProtistasea-level changessedimentary rockssedimentsshallow-water environmentSouthern Europestable isotopesstratigraphic boundaryTertiarytransition zonesUmbria Italyupper EoceneVeneto ItalyVicenza Italyurn:org.iodp:exp:199urnlargerWorkCitationcampaignurn:org.iodp:exp:199:site:1218urnlargerWorkCitationstudyurn:org.iodp:exp:199urnlargerWorkCitationcampaignEnglishgeoscientificInformation-135.220013.57008.530046.4100Veneto ItalyUmbria ItalyMarches Italy