An improved radiocarbon chronology for MD-982167, eastern Indian Ocean: synchronizing paleomagnetic intensity and 10Be across the Laschamp event

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dc.contributor.authorLevchenko, VAen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorOpdyke, BNen_AU
dc.contributor.authorMifsud, Cen_AU
dc.contributor.authorWilliams, AGen_AU
dc.contributor.authorKlootwijk, Cen_AU
dc.date.accessioned2010-11-05T04:26:21Zen_AU
dc.date.available2010-11-05T04:26:21Zen_AU
dc.date.issued2009-06-02en_AU
dc.date.statistics2009-06-02en_AU
dc.description.abstractThe production rate of cosmogenic isotopes 10Be and 14C is influenced by variations in the primary cosmic-ray flux and by changes of the Earth’s magnetic field, which has experienced a number of significant perturbations during the late Quaternary (e.g. Laschamp excursion, ca. 41 kyr BP). Understanding these changes and synchronizing variations in paleomagnetic intensity derived from various marine sediment cores can often help constrain the quality of 14C dating, particularly for times beyond IntCal04 between 30 and 50 kyr ago, leading to improved overall core chronologies and determination of ocean sedimentation rates. An often used proxy for these paleomagnetic changes is the concentration of atmospheric fallout of 10Be in marine sediments. The ocean core MD-982167 recovered from the Scott Plateau in the eastern Indian Ocean (13°09′S, 121°35′E; depth of 1981m) has an established δ18O stable isotope stratigraphy and a high sedimentation rate of 10 to 20 cm/kyr based on a preliminary chronology tied to ice-core records. This in turn makes MD-982167 amenable to high-resolution 10Be assay across the Laschamp period. We have completed measurements of 10Be and 14C (in both foraminifera and fine sediments) and paleomagnetic intensity in core MD-982167. We are able to correlate variations in 10Be with paleomagnetic intensity recorded in these ocean sediments based on our detailed radiocarbon age-depth profile and confirm a strong presence of the Laschamp excursion at 39.9 ± 1.3 kyr BP. Comparing the variations of atmospheric-derived 10Be in MD-982167 tied to our improved radiocarbon chronology with 10Be established from the ice cores and will allow much better correlation between marine sedimentary and ice-core records across recent stadial and interstadial climatic events.en_AU
dc.identifier.citationLevchenko, V., Fink, D., Opdyke, B., Mifsud, C., Williams, A., & Klootwijk, C. (2009). An improved radiocarbon chronology for MD-982167, eastern Indian Ocean: synchronizing paleomagnetic intensity and 10Be across the Laschamp event. Presentation to the 20th International Radiocarbon Conference, 31st May - 5th June 2009, Big Island, Hawaii: Kailua-Kona.en_AU
dc.identifier.conferenceenddate5 June 2009en_AU
dc.identifier.conferencename20th International Radiocarbon Conferenceen_AU
dc.identifier.conferenceplaceHawaii: Kailua-Kona.en_AU
dc.identifier.conferencestartdate31 May 2009en_AU
dc.identifier.govdoc3026en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2826en_AU
dc.language.isoenen_AU
dc.publisher20th International Radiocarbon Conferenceen_AU
dc.subjectCarbon 14en_AU
dc.subjectIndian Oceanen_AU
dc.subjectPaleomagnetismen_AU
dc.subjectBeryllium 10en_AU
dc.subjectQuaternary perioden_AU
dc.subjectIsotope datingen_AU
dc.titleAn improved radiocarbon chronology for MD-982167, eastern Indian Ocean: synchronizing paleomagnetic intensity and 10Be across the Laschamp eventen_AU
dc.typeConference Presentationen_AU
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