[B-CG08] Phanerozoic biodiversity change: Extinction and diversification

Tue. May 28, 2019 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Yukio Isozaki(Department of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo), Yusuke Sawaki(The University of Tokyo)

Phanerozoic biodiversity is the consequence of repeated extinctions and following diversifications in the past, which were caused by large-scale environmental changes, in particular, by extremely rapid and drastic forcing that changed the environments of the biosphere. Irreversible and episodic changes in material cycling on the planet and influences of severe galactic cosmic radiation enhanced by encounter with dark cloud are nominated as major driving mechanisms for the alleged rapid, large-scale environmental perturbations. The biodiversity change in the fossiliferous Phanerozoic record is characterized by 5 major mass extinctions within the long-term trend of diversity increase. Nonetheless, each extinction event has been explained rather in ad hoc manner, without any universal explanation. Therefore, ultimate triggers that caused the Phanerozoic biodiversity still remain as unsolved issues. This session discusses the ancient environmental changes related to Phanerozoic biodiversity under a new light of the recent progress in geology.

[BCG08-P01] Marine Osmium isotope record across the Aptian/Albian boundary to elucidate the relationship between the Oceanic Anoxic Event 1b and massive volcanic activities at the Southern Kerguelen Plateau

*Hironao Matsumoto¹, Junichiro Kuroda¹, Rodolfo Coccioni², Naohiko Ohkouchi³, Nanako O. Ogawa³, Saburo Sakai³, Katsuhiko Suzuki³, Fabrizio Frontalini², Andrea Mazzoli² (1.Department of Earth and Planetary Science, The University of Tokyo, 2.DiSPeA, University of Urbino, 3.Japan Agency for Marine-Earth Science and Technology)

[BCG08-P02] Rhaetian (Late Triassic) conodont biostratigraphy of the Panthalassa Ocean and the final extinction of conodonts at the end of the Triassic

*Kanna Yamasaki¹, Daisuke Yamashita², Tetsuji Onoue¹ (1.Kumamoto University, 2.Satsumasendai City Office)

[BCG08-P03] Paleoenvironmental changes across the Permian/Triassic boundary sections in the Mino Belt, central Japan

*Shinya Uemura¹, Tetsuji Onoue¹ (1.Kumamoto University)

[BCG08-P04] Geotectonic history of Mona Complex in Anglesey-Lleyn, Wales

*HISASHI ASANUMA¹, Yusuke Sawaki¹, Shigenori Maruyama² (1.The University of Tokyo, 2.Earth-Life Science Institute, Tokyo Institute of Technology)

[BCG08-P05] Radiogenic Sr isotope chemostratigraphy of the Ediacaran Doushantuo Formation in the Yangtze Craton, South China

*Yusuke Sawaki¹ (1.The University of Tokyo)

Session information