17:15 〜 19:15
[MIS06-P08] Precise inter-site correlation of IODP-ODP Japan Sea sediment cores based on core-logging integration
キーワード：IODP、ODP、コア-ロギング統合、ReCoRD (ReC23-03)
Under the Repository Core Re-Discovery Program (ReCoRD) ReC23-03, led by Seki, we are studying the lamina stratigraphy of Miocene Japan Sea sediments and the oceanic environmental changes associated with rapid warming at 10.8 Ma on a 100- to 1000-year scale to elucidate the mechanisms of environmental change in the eastern Asian margin under a climate warmer than today. To this end, we have started a study to further refine the Miocene cyclostratigraphy established at International Ocean Drilling Program (IODP) Exp. 346 Sites U1425 and U1430, and to project this precise chrono-cyclostratigraphy onto Sites 794, 795, and 797, which are legacy cores of the Ocean Drilling Program (ODP).
We found that the variation of resistivity logging (FMS) at Sites U1425 and U1430 is very similar to the variation of core photograph RGB values (Log(R/G); color saturation) measured onboard during the Expedition. The use of FMS and RGB sampled on the order of mm enabled core logging integration on the cm scale. In addition, since FMS is obtained at similar resolution in the legacy cores, it is expected that the Miocene stratigraphic levels can be contrasted on the cm scale among the sites.
Such an exact correlation of the FMS data position onto the stratigraphic position of sediment facies in the core would enable us to apply a generative AI developed by Baharuddin and John (2025 in press) which could regenerate the appearance of sediment facies from FMS data. Since recoveries of the Miocene sections in the legacy cores were poorer due to their fragile property, reconstruction of graphically interpretable sediment facies for the lost section will help us to establish better stratigraphic correlation between IODP U1425/U1430 and the legacy sites.
We found that the variation of resistivity logging (FMS) at Sites U1425 and U1430 is very similar to the variation of core photograph RGB values (Log(R/G); color saturation) measured onboard during the Expedition. The use of FMS and RGB sampled on the order of mm enabled core logging integration on the cm scale. In addition, since FMS is obtained at similar resolution in the legacy cores, it is expected that the Miocene stratigraphic levels can be contrasted on the cm scale among the sites.
Such an exact correlation of the FMS data position onto the stratigraphic position of sediment facies in the core would enable us to apply a generative AI developed by Baharuddin and John (2025 in press) which could regenerate the appearance of sediment facies from FMS data. Since recoveries of the Miocene sections in the legacy cores were poorer due to their fragile property, reconstruction of graphically interpretable sediment facies for the lost section will help us to establish better stratigraphic correlation between IODP U1425/U1430 and the legacy sites.