Statistical analysis of ITRAX XRF data to identify marine incursion, sediment source, and saltwater leaching in tsunami deposits

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dc.contributor.authorKain, CLen_AU
dc.contributor.authorChagué-Goff, Cen_AU
dc.contributor.authorGoff, JRen_AU
dc.contributor.authorGadd, PSen_AU
dc.date.accessioned2016-05-17T23:39:45Zen_AU
dc.date.available2016-05-17T23:39:45Zen_AU
dc.date.issued2015-12-16en_AU
dc.date.statistics2016-05-18en_AU
dc.description.abstractGeochemical investigation of fine-grained tsunami sediments has found that a characteristic salinity signature can be commonly found in tsunami deposits and underlying soils following an event. We extend this method to assess historic and paleotsunami deposits and investigate a wider range of particle sizes, with the aim of identifying whether salinity signatures are present and determining the source material of the deposits. Geochemical and mineralogical investigation of seven short cores was undertaken at four sites in New Zealand, where historic and/or palaeotsunami deposits were present as sand, silt or gravel layers intercalated between soils. Geochemical signatures were measured using a high-resolution ITRAX X-ray fluorescence (XRF) core scanner and results were analysed using Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA). We were able to explore the signatures of historical events, verify that prehistoric deposits were laid down by tsunamis, and compare these sediments with the background depositional environment. A t-test of means was applied for salinity marker elements (S, Cl, Br) in the soils immediately above and below tsunami sand layers, to test for evidence of saltwater leaching. The dominant mineralogy of the sediments was determined using portable X-ray diffraction and the data used to consider source material and interpret the corresponding XRF data. Geochemical signatures were found to be site specific, depending primarily on the composition of the material. PCA and HCA results clearly distinguished the signature of the tsunami deposits from the background material at each individual site and were able to confirm or deny palaeodeposits as tsunami-related, by comparison with the signatures of known events in the same core or nearby. © 2014 American Geophysical Union.en_AU
dc.identifier.citationKain, CL, Chagué-Goff, C, Goff, J, & Gadd, P. (2015). Statistical analysis of ITRAX XRF data to identify marine incursion, sediment source, and saltwater leaching in tsunami deposits. Paper presented at the AGU Fall Meeting, 14-18 December 2015, Moscone South.en_AU
dc.identifier.conferenceenddate18 December 2015en_AU
dc.identifier.conferencenameAGU Fall Meetingen_AU
dc.identifier.conferenceplaceSan Fransisco, Californiaen_AU
dc.identifier.conferencestartdate14 December 2015en_AU
dc.identifier.govdoc6410en_AU
dc.identifier.otherNH33A-1894en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6819en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm15/webprogram/Paper62348.htmlen_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectGeochemical surveysen_AU
dc.subjectAquatic ecosystemsen_AU
dc.subjectTsunamisen_AU
dc.subjectSedimentsen_AU
dc.subjectSoilsen_AU
dc.titleStatistical analysis of ITRAX XRF data to identify marine incursion, sediment source, and saltwater leaching in tsunami depositsen_AU
dc.typeConference Abstracten_AU
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