[B-PT27_28PM1] Phanerozoic biodiversity change: Extinction and diversification

Mon. Apr 28, 2014 2:15 PM - 4:00 PM 213 (2F)

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(Tokyo Institute of Technology), Tomohiko Sato(Graduate School of Arts and Sciences, The University of Tokyo), Chair:Yusuke Sawaki(Tokyo Institute of Technology)

Biotic evolution was the consequence of repeated extinction and following diversification in the past, which was 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 in galactic cosmic radiation are nominated as major driving mechanism 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. Lately, the supply of essential element/material has emerged as a significant factor that determined the past evolution course. This session discusses the Phanerozoic biodiversity change under a new light of the recent progress in geology.

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2:15 PM - 2:30 PM

[BPT27-04] A global ocean oxidation event immediately after the Early Triassic thermal maximum

*Kunio KAIHO¹, Satoshi TAKAHASHI², Paul GORJAN³, Zhong-qiang CHEN⁴, Jinnan TONG⁴ (1.Tohoku University, 2.University of Tokyo, 3.Washington University, 4.China University of Geosciences)

2:30 PM - 2:45 PM

[BPT27-05] Cyanobacterial proliferation during the Early Triassic

*Ryosuke SAITO¹, Kunio KAIHO¹, Masahiro OBA¹, Jinnan TONG¹, Zhong-qiang CHEN¹, Satoshi TAKAHASHI¹, Jing CHEN¹ (1.Institute of Geology and Paleontology)

2:45 PM - 3:00 PM

[BPT27-06] Mo depleted ocean after the end Permian mass extinction referred from Mo and U behaviors in pelagic deep-sea sedimentary

*Satoshi TAKAHASHI¹, Shin-ichi YAMASAKI², Yasumasa OGAWA³, Kazuhiko KIMURA⁴, Kunio KAIHO⁵, Takeyoshi YOSHIDA⁵, Noriyoshi TSUCHIYA² (1.Department of Earth and Planetary Science, the University of Tokyo, 2.Graduate School of Environmental Studies, Tohoku University, 3.Graduate School of Engineering and Resource Science, Akita University, 4.School of food, Agricultual and Environmental Science, Miyagi University, 5.Department of Earth Science, Graduate School of Science, Tohoku University)

3:00 PM - 3:15 PM

[BPT27-07] Nitrogen isotope chemostratigraphy across the Permian-Triassic boundary at Chaotian, Sichuan, South China.

*Masafumi SAITOH¹, Yuichiro UENO¹, Manabu NISHIZAWA², Yukio ISOZAKI³, Ken TAKAI² (1.Tokyo Institute of Technology, 2.JAMSTEC, 3.The University of Tokyo)

3:15 PM - 3:30 PM

[BPT27-08] A remarkable sea-level drop and global cooling in the late Middle Permian: record from the mid-superoceanic limestone

*Daisuke KOFUKUDA¹, Yukio ISOZAKI¹, Hisayoshi IGO², Tomomi KANI³, Toyoho ISHIMURA⁴ (1.The University of Tokyo, Komaba, 2.Insititute of Natural History, 3.Kumamoto University, 4.AIST)

3:30 PM - 3:45 PM

[BPT27-09] Middle to Late Permian seawater Sr isotope variation linked to the glaciation/deglaciation

*Tomomi KANI¹, Daisuke KOFUKUDA², Yukio ISOZAKI² (1.Department of Earth and Environmental Sciences, Kumamoto University, 2.Department of Earth Science and Astronomy, The University of Tokyo)

3:45 PM - 4:00 PM

[BPT27-10] A unique low-latitude-type molluskan assemblage from the Permian Iwaizaki limestone in the S. Kitakami belt, NE Japan

*Yukio ISOZAKI¹, Tomoki KASE² (1.Dept. Earth Science & Astronomy, University of Tokyo, 2.National Science Museum)