Introduction (10:45 AM - 10:50 AM)
Session information
[J] Oral
B (Biogeosciences ) » B-CG Complex & General
[B-CG08] Phanerozoic biodiversity change: Extinction and diversification
Tue. May 28, 2019 10:45 AM - 12:15 PM 105 (1F)
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), Chairperson:Yukio Isozaki(Department of Earth Science and Astronomy, 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.
10:50 AM - 11:10 AM
[BCG08-01] The Ediacaran-Cambrian transition of North China
★Invited Papers
*Xingliang Zhang1 (1.State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, and Department of Geology, Northwest University)
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11:10 AM - 11:30 AM
[BCG08-02] The Qingjiang biota – An extraordinary new Burgess Shale-type fossil Lagerstätte from the early Cambrian of South China
★Invited Papers
*Dongjing Fu1, Xingliang Zhang1, Robert R. Gains2 (1.State Key Laboratory of the Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environment, Department of Geology, Northwest University, Xi’an 710069, PR China, 2.Department of Geology, Pomona College, Claremont, CA 91711, USA)
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11:30 AM - 11:50 AM
[BCG08-03] Enhanced flux of extraterrestrial 3He across the Permian–Triassic boundary
★Invited Papers
*Tetsuji Onoue1, Naoto Takahata2, Honami Sato4, Akira Ishikawa3, Katsuhito Soda1, Yuji Sano2, Yukio Isozaki2 (1.Kumamoto Univ., 2.Univ. Tokyo, 3.Tokyo Inst. Tech., 4.Chiba Inst. Tech.)
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11:50 AM - 12:10 PM
[BCG08-04] End-Triassic Mass Extinction: Causes and Consequences
★Invited Papers
*Wataru Fujisaki1 (1.Japan Agency for Marine-Earth Science and Technology)
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Discussion (12:10 PM - 12:15 PM)