Heavy minerals in the 2011 Tohoku-oki tsunami deposits—insights into sediment sources and hydrodynamics

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dc.contributor.authorJagodziński, Ren_AU
dc.contributor.authorSternal, Ben_AU
dc.contributor.authorSzczuciński, Wen_AU
dc.contributor.authorChagué-Goff, Cen_AU
dc.contributor.authorSugawara, Den_AU
dc.date.accessioned2020-10-12T22:50:56Zen_AU
dc.date.available2020-10-12T22:50:56Zen_AU
dc.date.issued2012-12-30en_AU
dc.date.statistics2020-10-13en_AU
dc.description.abstractThe 2011 Tohoku-oki tsunami left sand and mud deposits more than 4 km inland on the coastal plain of Sendai, Japan. The tsunami deposits, pre-tsunami soils and beach sediments were analysed for grain size, and heavy mineral content and assemblages to test the applicability of heavy mineral analyses in the identification of tsunami deposits and interpretation of associated sedimentation processes. Heavy minerals comprised on average 35% of the tsunami deposit in the 0.125–0.25 mm grain size fraction. The most common were orthopyroxenes, clinopyroxenes, amphiboles, limonites and opaque minerals. Heavy mineral concentrations and assemblages were similar in the tsunami deposits, beach and pre-tsunami soils and sediments and thus tsunami deposits could not simply be identified based on their heavy minerals. Sediment provenance analysis revealed that tsunami deposits left within 1.5 km of the shoreline were mostly eroded from the beach, dune and local soils, while deposits farther inland (> 1.5 km) were mostly derived from local soil erosion. No evidence was found for a significant contribution of offshore sediments. Detailed analyses revealed that the lowermost portion of tsunami deposits was mostly of local origin, while the sediment source of the upper portion was variable. A comparison with a previous study of heavy minerals in 2004 IOT deposits confirms that heavy minerals in tsunami deposits are mostly source-dependent and may represent a useful supplementary tool in studies of tsunami deposits. However, the interpretation must always be placed in the local geological context and corroborated with other “tsunami proxies”. © 2020 Elsevier B.V.en_AU
dc.identifier.citationJagodziński, R., Sternal, B., Szczuciński, W., Chagué-Goff, C., & Sugawara, D. (2012). Heavy minerals in the 2011 Tohoku-oki tsunami deposits—insights into sediment sources and hydrodynamics. Sedimentary Geology, 282, 57-64. doi:10.1016/j.sedgeo.2012.07.015en_AU
dc.identifier.issn0037-0738en_AU
dc.identifier.journaltitleSedimentary Geologyen_AU
dc.identifier.pagination57-64en_AU
dc.identifier.urihttps://doi.org/10.1016/j.sedgeo.2012.07.015en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/9893en_AU
dc.identifier.volume282en_AU
dc.language.isoenen_AU
dc.publisherElsevier B.V.en_AU
dc.subjectTsunamisen_AU
dc.subjectJapanen_AU
dc.subjectMineralsen_AU
dc.subjectGeologic depositsen_AU
dc.subjectSedimentationen_AU
dc.subjectCoastal regionsen_AU
dc.subjectGrain sizeen_AU
dc.subjectLimoniteen_AU
dc.subjectClinoptiloliteen_AU
dc.subjectAmphiboleen_AU
dc.subjectErosionen_AU
dc.titleHeavy minerals in the 2011 Tohoku-oki tsunami deposits—insights into sediment sources and hydrodynamicsen_AU
dc.typeJournal Articleen_AU
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