georefid:2004-070980SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G20580.12004-01-01publicationgeorefid:2004-070980doi:10.1130/G20580.1John, Cedric M.Universitaet Potsdam, Institut fuer Geowissenschaften, Potsdam, Federal Republic of GermanyauthorKarner, Garry D.Lamont-Doherty Earth Observatory, United StatesauthorMutti, MariaauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)32 (9)829-832delta (super 18) O (sub benthic) values from Leg 194 Ocean Drilling Program Sites 1192 and 1195 (drilled on the Marion Plateau) were combined with deep-sea values to reconstruct the magnitude range of the late middle Miocene sea-level fall (13.6-11.4 Ma). In parallel, an estimate for the late middle Miocene sea-level fall was calculated from the stratigraphic relationship identified during Leg 194 and the structural relief of carbonate platforms that form the Marion Plateau. Corrections for thermal subsidence induced by Late Cretaceous rifting, flexural sediment loading, and sediment compaction were taken into account. The response of the lithosphere to sediment loading was considered for a range of effective elastic thicknesses (10<T (sub e) <40 km). By overlapping the sea-level range of both the deep-sea isotopes and the results from the backstripping analysis, we demonstrate that the amplitude of the late middle Miocene sea-level fall was 45-68 m (56.5+ or -11.5 m). Including an estimate for sea-level variation using the delta (super 18) O (sub benthic) results from the subtropical Marion Plateau, the range of sea-level fall is tightly constrained between 45 and 55 m (50.0+ or -5.0 m). This result is the first precise quantitative estimate for the amplitude of the late middle Miocene eustatic fall that sidesteps the errors inherent in using benthic foraminifera assemblages to predict paleo-water depth. The estimate also includes an error analysis for the flexural response of the lithosphere to both water and sediment loads. Our result implies that the extent of ice buildup in the Miocene was larger than previously estimated, and conversely that the amount of cooling associated with this event was less important.completedStratigraphyIsotope geochemistryancient ice agesAnomalinidaeAustralasiaAustraliabackstrippingbenthic taxabiochemistrycarbonate platformsCassidulinaceaCenozoicCibicidoidesCoral Seadeep-sea environmenteustacyflexureForaminiferageochemistrygeophysical methodsgeophysical profilesgeophysical surveysglacial environmentglaciomarine environmentInvertebrataisotope ratiosisotopesLeg 194lithosphereloadingmarine environmentMarion Plateaumechanical propertiesmicrofossilsmiddle MioceneMioceneNeogeneO-18/O-16Ocean Drilling Programoceanic lithosphereODP Site 1192ODP Site 1193ODP Site 1194ODP Site 1195oxygenPacific OceanpaleobathymetrypaleoecologyplateausProtistaQueensland Australiareflection methodsRotaliinasea-level changesseismic methodsseismic profilesSouth PacificSouthwest Pacificstable isotopessurveysTertiaryWest Pacificurn:org.iodp:exp:194urnlargerWorkCitationcampaignurn:org.iodp:exp:194:site:1192urnlargerWorkCitationstudyurn:org.iodp:exp:194urnlargerWorkCitationcampaignurn:org.iodp:exp:194:site:1193urnlargerWorkCitationstudyurn:org.iodp:exp:194urnlargerWorkCitationcampaignurn:org.iodp:exp:194:site:1194urnlargerWorkCitationstudyurn:org.iodp:exp:194urnlargerWorkCitationcampaignurn:org.iodp:exp:194:site:1195urnlargerWorkCitationstudyurn:org.iodp:exp:194urnlargerWorkCitationcampaignEnglishgeoscientificInformation151.4700152.4100-20.3500-20.1400