10:45 AM - 11:00 AM
[MGI28-06] Introduction of the Japan Sea ReCoRD project (ReC23-03: The Japan Sea paleoceanography and paleoclimatology during the Miocene)
Keywords:The Repository Core Re-Discovery Program (ReCoRD), IODP Exp. 346, ODP Leg 127, The Japan Sea, Miocene, paleoceanography and paleoclimatology
In the Repository Core Re-Discovery Program (ReCoRD), repository cores drilled by DSDP, ODP, and IODP, and stored at Kochi Core Center (KCC) are reanalyzed by the ReCoRD research team, which is similar to science parties of drilling expeditions (https://j-desc.org/en/record/).
The non-destructive analysis and sampling party of third ReCoRD project, ReC23-03 “The Japan Sea paleoceanography and paleoclimatology during the Miocene” is conducted in the last year. In this project, we focus on understanding the short time scale oceanic environmental changes in the warmer-than-today world, which is important for addressing future global warming. We are especially focusing on;
1) centennial to millennial scale oceanographic changes recorded in laminated sediments.
2) rapid warming event (~10.8Ma) and subsequent oceanographic condition
To understand oceanographic condition properly, comparison of sediments deposited at different water depth at the same time is necessary.
We use the Miocene Japan Sea sediments recovered at Sites 794, 795, 797 (drilled by ODP Leg 127 in 1989) and Sites U1425 and U1430 (drilled by IODP Exp. 346 in 2013). During ODP Leg 127, many Miocene sediments were drilled from the deeper part of the Japan Sea (Tamaki, 1990). However, core gap exists because of single hole drilling, and high-resolution (less than orbital scale) oceanographic reconstruction has not been conducted enough. Although sediments taken by IODP Exp. 346 provide continuous spliced sediments provided by multi hole drilling (Tada et al., 2015; Irino et al., 2018), the Miocene oceanographic reconstruction is limited because comparison of different water depth is available only during short time period (Tada et al., 2015; Kurokawa et al., 2019). Therefore, in this project, our objective is to reconstruct millennial-scale, three dimensional oceanographic changes during the Miocene using revised high-resolution age models.
In the presentation, we introduce 20 sample requests submitted to the Japan Sea ReCoRD project (ReC23-03), and explain relationship between them and progress of the project. We also present assets of using non-destructive measurement (XRF core scanner, X-ray CT) results during the sampling party.
ReC23-03 members:
Chiaki Aoyagi (Hokkaido University), Takuto Ando (Akita University), Masayuki Ikeda (University of Tokyo), Naoko Ono (Toho University), Yuji Kato (Kochi University), Yusuke Kuwahara (University of Tokyo), Daisuke Kuwano (Kyoto University), Cédric M. John, (Queen Mary University of London), Shunsuke Tagaya (Shinshu University), Nao Taniguchi (Hokkaido University), Mizuki Tojima (University of Tokyo), Fumiko Nara (JAEA), Masato Nosakon (Toho University), Hiroki Hayashi (Shimane University), Kotaro Hoshi (Hokkaido University), Hironao Matsumoto (Tsukuba Uni.), Kazuhide Mimura (GSJ, AIST), An-Sheng Lee (National Taiwan University), Kosei Yamaguchi (Toho University), Haifa AlSalmi (Queen Mary University of London), Daqian Shi (Queen Mary University of London)
The non-destructive analysis and sampling party of third ReCoRD project, ReC23-03 “The Japan Sea paleoceanography and paleoclimatology during the Miocene” is conducted in the last year. In this project, we focus on understanding the short time scale oceanic environmental changes in the warmer-than-today world, which is important for addressing future global warming. We are especially focusing on;
1) centennial to millennial scale oceanographic changes recorded in laminated sediments.
2) rapid warming event (~10.8Ma) and subsequent oceanographic condition
To understand oceanographic condition properly, comparison of sediments deposited at different water depth at the same time is necessary.
We use the Miocene Japan Sea sediments recovered at Sites 794, 795, 797 (drilled by ODP Leg 127 in 1989) and Sites U1425 and U1430 (drilled by IODP Exp. 346 in 2013). During ODP Leg 127, many Miocene sediments were drilled from the deeper part of the Japan Sea (Tamaki, 1990). However, core gap exists because of single hole drilling, and high-resolution (less than orbital scale) oceanographic reconstruction has not been conducted enough. Although sediments taken by IODP Exp. 346 provide continuous spliced sediments provided by multi hole drilling (Tada et al., 2015; Irino et al., 2018), the Miocene oceanographic reconstruction is limited because comparison of different water depth is available only during short time period (Tada et al., 2015; Kurokawa et al., 2019). Therefore, in this project, our objective is to reconstruct millennial-scale, three dimensional oceanographic changes during the Miocene using revised high-resolution age models.
In the presentation, we introduce 20 sample requests submitted to the Japan Sea ReCoRD project (ReC23-03), and explain relationship between them and progress of the project. We also present assets of using non-destructive measurement (XRF core scanner, X-ray CT) results during the sampling party.
ReC23-03 members:
Chiaki Aoyagi (Hokkaido University), Takuto Ando (Akita University), Masayuki Ikeda (University of Tokyo), Naoko Ono (Toho University), Yuji Kato (Kochi University), Yusuke Kuwahara (University of Tokyo), Daisuke Kuwano (Kyoto University), Cédric M. John, (Queen Mary University of London), Shunsuke Tagaya (Shinshu University), Nao Taniguchi (Hokkaido University), Mizuki Tojima (University of Tokyo), Fumiko Nara (JAEA), Masato Nosakon (Toho University), Hiroki Hayashi (Shimane University), Kotaro Hoshi (Hokkaido University), Hironao Matsumoto (Tsukuba Uni.), Kazuhide Mimura (GSJ, AIST), An-Sheng Lee (National Taiwan University), Kosei Yamaguchi (Toho University), Haifa AlSalmi (Queen Mary University of London), Daqian Shi (Queen Mary University of London)