Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8882
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dc.contributor.authorallFlorindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallFarmer, R. K.; Department of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USAen
dc.contributor.authorallHarwood, D. M.; Department of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USAen
dc.contributor.authorallCody, R. D.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealanden
dc.contributor.authorallLevy, R.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealanden
dc.contributor.authorallBohaty, S. M.; School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UKen
dc.contributor.authorallCarter, L.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealanden
dc.contributor.authorallWinkler, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.date.accessioned2014-01-28T13:54:34Zen
dc.date.available2014-01-28T13:54:34Zen
dc.date.issued2013-11en
dc.identifier.urihttp://hdl.handle.net/2122/8882en
dc.description.abstractNew paleomagnetic results from lower-to-middle Miocene samples from Ocean Drilling Program (ODP) Holes 744A and 744B, cored during ODP Leg 119 on the southern Kerguelen Plateau (Indian Ocean sector; Southern Ocean), provide a chronostratigraphic framework for an existing and under-utilized paleoclimate archive during a key period of Antarctic climate and ice sheet evolution. Site 744 is strategically positioned for high-latitude paleoceanographic and paleoclimatic studies because it lies within the southern domain of the Antarctic Circumpolar Current (ACC) and in proximity to the large and active Lambert Glacier-Amery Ice Shelf drainage system of the East Antarctic Ice Sheet. Magnetostratigraphic results were reported previously for this site, but technical difficulties and limited sampling prevented confident correlation of the magnetic polarity record with the geomagnetic polarity timescale. Our results, which are constrained by new semi-quantitative analyses of diatom assemblages and radiolarian first and last appearance events that are evaluated within a regional Southern Ocean biostratigraphic dataset through Constrained Optimization (CONOP) model runs, permit significant refinement of previous age models for the lower-to-middle Miocene sequence recovered at Site 744 (spanning the interval from ~ 21 to 13.7 Ma). An extended record of sediment accumulation, with average sedimentation rates of ~ 0.7–0.9 cm/kyr, is interrupted by a series of hiatuses in the middle Miocene. These disruptions in sediment supply, or erosional events, could mark a local response of north–south fluctuations in the location and/or strength of the Antarctic Circumpolar Current during transient glacial events within the Mid-Miocene Climate Optimum (MMCO; ~ 17 to 14.45 Ma). With the enhanced age control provided by this study, combined with a refined chronostratigraphy for the underlying upper Eocene to Oligocene strata, Site 744 becomes a good candidate for future high-resolution stable isotope and microfossil paleoecological work, which will further elucidate the late Paleogene and early Neogene paleoenvironmental history of the Southern Ocean.en
dc.language.isoEnglishen
dc.publisher.nameElsevier Science Limiteden
dc.relation.ispartofGlobal and planetary changeen
dc.relation.ispartofseries/ 110 (2013)en
dc.subjectAntarcticaen
dc.subjectPaleoclimateen
dc.subjectMioceneen
dc.subjectDiatom biostratigraphyen
dc.subjectPaleomagnetismen
dc.subjectCONOPen
dc.titlePaleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarcticaen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber434 – 454en
dc.subject.INGV03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatologyen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transporten
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.10. Stratigraphyen
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetismen
dc.identifier.doi10.1016/j.gloplacha.2013.05.004en
dc.description.obiettivoSpecifico2.2. Laboratorio di paleomagnetismoen
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.relation.issn0921-8181en
dc.relation.eissn1872-6364en
dc.contributor.authorFlorindo, F.en
dc.contributor.authorFarmer, R. K.en
dc.contributor.authorHarwood, D. M.en
dc.contributor.authorCody, R. D.en
dc.contributor.authorLevy, R.en
dc.contributor.authorBohaty, S. M.en
dc.contributor.authorCarter, L.en
dc.contributor.authorWinkler, A.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentDepartment of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USAen
dc.contributor.departmentDepartment of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USAen
dc.contributor.departmentAntarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealanden
dc.contributor.departmentAntarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealanden
dc.contributor.departmentSchool of Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UKen
dc.contributor.departmentAntarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealanden
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione AC, Roma, Italia-
crisitem.author.deptDepartment of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USA-
crisitem.author.deptDepartment of Geosciences, University of Nebraska-Lincoln, Lincoln, NE 68588-0340, USA-
crisitem.author.deptAntarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand-
crisitem.author.deptNational Oceanography Centre, University of Southampton, Southampton, UK.-
crisitem.author.deptAntarctic Research Centre, Victoria University of Wellington, Kelburn Parade, PO Box 600, Wellington 6012, New Zealand-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.orcid0000-0002-6058-9748-
crisitem.author.orcid0000-0002-0653-0059-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent03. Hydrosphere-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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