Japan Geoscience Union Meeting 2021

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS28] Evolution of Pelagic Realm

Sat. Jun 5, 2021 1:45 PM - 3:15 PM Ch.26 (Zoom Room 26)

convener:Atsushi Matsuoka(Department of Geology, Faculty of Science, Niigata University), Toshiyuki Kurihara(Graduate School of Science and Technology, Niigata University), Junichiro Kuroda(Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, the University of Tokyo), XIN LI(State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences), Chairperson:Atsushi Matsuoka(Department of Geology, Faculty of Science, Niigata University), Junichiro Kuroda(Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, the University of Tokyo)

1:45 PM - 2:00 PM

[MIS28-01] Toward a global correlation of the Jurassic–Cretaceous boundary among pelagic, neritic and terrestrial sequences in the Pacific and Asia

*Atsushi Matsuoka1 (1.Department of Geology, Faculty of Science, Niigata University)

Keywords:Jurassic-Cretaceous boundary, International Subcommission on Cretaceous Stratigraphy, Berriasian Working Group, Global Boundary Stratotype Section and Point , deep-sea drilling, radiolaria

The decision of the Global Boundary Stratotype Section and Point (GSSP) of the Jurassic–Cretaceous boundary (JKB) is one of urgent tasks because the JKB is the last system boundary without stratotype in the Phanerozoic. The previous Berriasian Working Group (BWG) in the International Subcommission on Cretaceous Stratigraphy (ISCS) decided to use the base of the Calpionella alpina Subzone as the primary marker and proposed the Tre Maroua section in south France as the candidate for the GSSP of the Berriasian Stage in 2019. However, the ISCS did not support this proposal as the result of ballot by the voting members. Upon this situation, a new working group was organized in December 2020. The new chairperson is Jacek Grabowski in the Polish Geological Institute. The author (AM) is one of the BWG members (20 in total) and is expected to review radiolarian biostratigraphy and to provide new data from the pelagic sequences especially in the Pacific and Asian regions. Aims of the current BWG are to choose the primary marker and to propose the GSSP candidate for the base of the Berriasian Stage. Continuous sequences in the pelagic realm have a great potential for clarifying tie points among biostratigraphy, chemostratigraphy, magnetostratigraphy and any stratigraphies. This presentation introduces ongoing activities of the BWG including a global correlation among pelagic, neritic and terrestrial sequences in the Pacific and Asian regions around the JKB. A new proposal for deep-sea drilling in the western Pacific is also presented.