Japan Geoscience Union Meeting 2022

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[E] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS07] Developments and applications of XRF-core scanning techniques in natural archives

Fri. May 27, 2022 3:30 PM - 5:00 PM 304 (International Conference Hall, Makuhari Messe)

convener:Jyh-Jaan Steven Huang(Institute of Oceanography, National Taiwan University), convener:Atsuko Amano(National institute of Advanced Industrial Science and Technology), Masafumi MURAYAMA(Faculty of Agriculture and Marine Science, Kochi University), convener:Ludvig A Lowemark(National Taiwan University), Chairperson:Jyh-Jaan Steven Huang(Institute of Oceanography, National Taiwan University), Atsuko Amano(National institute of Advanced Industrial Science and Technology), Masafumi MURAYAMA(Faculty of Agriculture and Marine Science, Kochi University), Ludvig A Lowemark(National Taiwan University)

3:35 PM - 3:55 PM

[MIS07-01] Use of XRF core scanning for submarine paleoseismology

★Invited Papers

*Ken Ikehara1 (1.Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology)

Keywords:submarine paleoseismology, XRF core scanning, event deposit

Examining geological evidences on the past large earthquakes and tsunamis preserved in the sedimentary successions is essential to reconstruct the long-term history of earthquakes and tsunamis and to deliver observational data that help to reduce uncertainties in seismic hazard assessment for long return periods. To detect earthquake- and tsunami-related event deposits in the sedimentary successions, non-destructive geochemical characterization using µ-XRF core scanning has been often performed. Differences in grain-size and grain-composition between event and non-event deposits affect geochemical compositions. Rapid and non-destructive measurement of µ-XRF core scanning gives us useful information on detection of event deposits even which are difficult to distinguish visually. Geochemical properties of event deposits are also useful for sediment provenance analysis. However, some geochemical proxies are useless to distinguish event and non-event deposits when grain-size and compositions have little difference each other. In the case, combination with the other methodologies such as visual observation, radiography, grain fabric and physical properties are quite important. In this presentation, I will show you some XRF core scanning results of marine cores collected from the Japanese water for the purpose of submarine paleoseismology.