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dc.contributor.authorGriggs, Adam J.
dc.contributor.authorDavies, Siwan M.
dc.contributor.authorAbbott, Peter M.
dc.contributor.authorColeman, Mark
dc.contributor.authorPalmer, Adrian P.
dc.contributor.authorRasmussen, Tine Lander
dc.contributor.authorJohnston, Richard
dc.date.accessioned2018-02-09T09:48:53Z
dc.date.available2018-02-09T09:48:53Z
dc.date.issued2015-12-30
dc.description.abstractLocalized tephra deposition in marine sequences is the product of many complex primary and secondary depositional processes. These can significantl y influence the potential applicability of tephra depos- its as isochronous marker horizons and current techniques, used in isolation, may be insufficient to fully unravel these processes. Here we demonstrate the innovative application of X-ray microtomography ( m CT) to success- fully identify tephra deposits preserved within marine s ediments and use these parameters to reconstruct their internal three-dimensional structure. Three-dimensiona l visualizations and animations of tephra dispersal in the sediment permit a more thorough assessment of postdepositional processes revealing a number of complex microsedimentological features that are not revealed by conventional methods. These features include biotur- bation burrows and horizontally discontinuous tephra packages, which have important ramifications for the stratigraphic placement of the isochron in a sedimentary sequence. Our results demonstrate the potential for utilizing rigorous two and three-dimensional microsedimentological analysis of the ichnofabric to enhance and support the use of tephra deposits as isochronous marker horizons and to identify the stratigraphic position that best reflects the primary fallout of ash. The application also provides an exceptional insight into the style and rate of sedimentation processes and permits an assessment of the stratigraphic integrity of a tephra deposit. We discuss the possibility of applying these m CT methods to the identification of cryptotephras within various paleoclimatic sequences and to enhance our understanding of marine sedimentation processes.en_US
dc.identifier.citationGriggs, A.J., Davies, S.M., Abbott, P.M., Coleman, M., Palmer, A.P., Rasmussen, T.L.R., Johnston, R. Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography. Geochemistry Geophysics Geosystems. 2015;16(12):4329-4343en_US
dc.identifier.cristinIDFRIDAID 1319994
dc.identifier.doi10.1002/2015GC006073
dc.identifier.issn1525-2027
dc.identifier.urihttps://hdl.handle.net/10037/12111
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.journalGeochemistry Geophysics Geosystems
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGEen_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.titleVisualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomographyen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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