JpGU-AGU Joint Meeting 2017

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[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS20] [JJ] Evolution of the Pelagic Realm

Thu. May 25, 2017 10:45 AM - 12:15 PM 201B (International Conference Hall 2F)

convener:Atsushi Matsuoka(Department of Geology, Faculty of Science, Niigata University), Toshiyuki Kurihara(Graduate School of Science and Technology, Niigata University), Tetsuji Onoue(Earth and Environmental Sciences, Graduate School of Science and Technology, Kumamoto University), Katsunori Kimoto(Japan Agency for Marine-Earth Science and Technology), Chairperson:Atsushi Matsuoka(Department of Geology, Faculty of Science, Niigata University), Chairperson:Toshiyuki Kurihara(Graduate School of Science and Technology, Niigata University)

12:00 PM - 12:15 PM

[MIS20-06] Bioturbation in the Pacific abyssal plain: its paleontological and sedimentological implications

★Invited papers

*Koji Seike1, Hidetaka Nomaki2 (1.Atmosphere and Ocean Research Institute, University of Tokyo, 2.JAMSTEC)

Keywords:Burrow, Trace fossil, Ichnology, Sedimentary structures

Abyssal plain is the largest single marine ecosystem on Earth and contains abundant benthic fauna living on and in the seafloor sediment such as gastropods, bivalves, polychaetes, echinoderms, and crustaceans. The benthic fauna are important in the seafloor environments, because they mix sediments, disrupt microstratigraphy, and influence the biogeochemistry of seafloor sediment. The process of biomixing of sediment is known as bioturbation. The abyssal plain is characterized by low-sedimentation rate thereby being heavily disturbed by bioturbation. Hence, investigating nature of bioturbation is essential for further understanding on organism–sediment interactions, and is also important for sedimentology and paleontology. In this presentation, we review previous biological and ichnological studies on the abyssal plain settings, and show preliminary result of our ongoing research project on bioturbation and biogeochemical cycles under different settings on organic carbon input to the seafloor in the Pacific abyssal plain.