[M-GI31] 地球掘削科学

[MGI31-P08] Physical properties records of sedimentary successions recovered in the Gulf of Cadiz and Alboran Basin: preliminary results of IODP Expedition 401

*Xunhui XU¹、Rachel FLECKER²、Emmanuelle DUCASSOU³、Trevor WILLIAMS⁴、Fadl RAAD⁵、Jonathan STINE⁶、Manuel TEIXEIRA⁷、Shaoru YIN⁸、Sarah FEAKINS⁹、Clara BLÄTTLER¹⁰、Kosuke EGAWA¹¹、Erika TANAKA¹²、Weiren LIN¹、the IODP Expedition 401 Scientists (1.Kyoto University、2.University of Bristol、3.University of Bordeaux、4.Texas A&M University、5.Università di Corsica Pasquale Paoli、6.University of Minnesota-Twin Cities、7.University of Lisbon、8.Second Institute of Oceanography, Ministry of Natural Resources、9.University of Southern California、10.University of Chicago、11.Kyushu University、12.Kochi University)

キーワード：Evolution of Atlantic-Mediterranean gateway, Messinian Salinity Crisis, Physical properties, Environmental change

International Ocean Discovery Program (IODP) Expedition 401 recovered Plio-Miocene successions from the Atlantic and western Mediterranean Sea. As the first land-to-sea drilling project, Expedition 401 aims to uncover the seawater exchange record between Atlantic and Mediterranean before, during, and after the Messinian Salinity Crisis (MSC) and the role of gateway evolution.

Sites U1610 and U1611, located in the Gulf of Cadiz and Alboran Basin, respectively, are highlighted in this presentation due to the variety in sedimentary and post-depositional features at these sites. In addition to the carbonate contents, records of physical properties, including gamma-ray attenuation bulk density, magnetic susceptibility, P-wave velocity, natural gamma ray radiation, thermal conductivity, color and lightness information of recovered sediments were recovered in Sites U1610 and U1611. It can provide a first view about the differential physical properties of the formations and possible post-deposition environments at the Atlantic-Mediterranean gateway.