Particle-size distribution of inferred tsunami deposits in Sur Lagoon,Sultanate of Oman |
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| Authors: | SV Donato EG Reinhardt JI Boyce JE Pilarczyk BP Jupp |
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| Institution: | 1. School of Biological, Earth and Environmental Sciences, UNSW Australia, Sydney, NSW 2052, Australia;2. Institute for Environmental Research, Australian Nuclear and Science Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;3. Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, Casilla (P.O. Box) 1020, Valparaíso 1, Chile;1. Graduate School of Frontier Science, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8561, Japan;2. Earthquake Research Institute, University of Tokyo, 1-1-1, Yayoi, Bunkyo, Tokyo 113-0032, Japan;3. Now at National Museum of Nature and Science, 4-1-1, Amakubo, Tsukuba, Ibaraki, 305-0005, Japan;1. Clermont Université, Université Blaise Pascal, GEOLAB, BP 10448, F-63000 Clermont-Ferrand, France;2. Clermont Université, Université Blaise Pascal, Laboratoire Magmas et Volcans, BP 10448, F-63000 Clermont-Ferrand, France;3. CNRS, UMR 6042, GEOLAB, F-63057 Clermont-Ferrand, France;4. CNRS, UMR 6524, LMV, F-63038 Clermont-Ferrand, France;5. IRD, R 163, LMV, F-63038 Clermont-Ferrand, France;6. Clermont Université, Université d''Auvergne, INSERM UMR 990, F-63005 Clermont-Ferrand, France;7. Université Bordeaux 1, CNRS-UMR 5805 EPOC, Avenue des Facultés, BP 184, F-33405 Talence, France;1. International Research Institute of Disaster Science, Tohoku University, Aoba 6-6-40, Aramaki, Aoba-ku, Sendai 980-8579, Japan;2. School of Engineering, Tohoku University, Aoba 6-6, Aramaki, Aoba-ku, Sendai 980-8579, Japan;3. Faculty of Liberal Arts, Tohoku Gakuin University, 2-1-1 Tenjinzawa, Izumi-ku, Sendai, Miyagi 981-3193, Japan;4. Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan;1. IDL-FCGUL, Faculdade de Ciências de Lisboa, Ed. C3.3.22, Campo Grande, 1749-016, Portugal;2. CIMA-FCT, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal;3. Departamento de Geología y Geoquímica, Universidad Autónoma de Madrid, 28049-Madrid, Spain;4. Laboratório Nacional de Energia e Geologia (LNEG), Apartado 7586, Alfragide, 2721-866, Portugal;5. Departamento de Geodinámica y Paleontología, Facultad de Ciencias Experimentales, Campus de El Carmen, Avda. Tres de Marzo, 21071-Huelva, Spain |
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| Abstract: | The sedimentary characteristics of shell beds within an interpreted tsunami deposit from Sur Lagoon, Oman were examined using shell taphonomy and high-resolution particle-size analysis. The tsunami bed was deposited by the 28 November, 1945 tsunami generated by the Makran subduction zone. Q-mode cluster analysis of particle-size data was evaluated as a means of discriminating individual tsunamite shell layers from lagoonal intertidal deposits. Results showed that the tsunami shell bed was more poorly sorted, and heterogeneous (in both the digested and undigested samples) than the background lagoonal sediments. The tsunami bed thickness correlated generally with the thickness of the shell-bed, however, cluster analysis extended the tsunami unit several centimeters above or below the shell bed in some cores. The particle-size analysis also showed subtle textural trends in the tsunami unit, suggesting that the tsunami bed was deposited in several distinctive phases during tsunami incursion into Sur Lagoon. The findings indicate that cluster analysis of particle-size data can be used to identify tsunami beds in intertidal environments and holds potential for identifying paleotsunami deposits in sediments from embayed intertidal–subtidal siliciclastic systems where obvious sedimentary structures may be absent. |
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