Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

B (Biogeosciences) » B-CG Complex & General

[B-CG10] Phanerozoic biodiversity change: Extinction and diversification

Mon. May 21, 2018 10:45 AM - 12:15 PM 102 (1F International Conference Hall, 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), Chairperson:Sawaki Yusuke(The University of Tokyo)

10:45 AM - 11:05 AM

[BCG10-07] P/T Boundary and C60 Fullerenes - A Materials Science Perspective -

★Invited Papers

*Hisanori Shinohara1, Ayano Nakagawa1, Yukio Isozaki2 (1.Nagoya University, 2.University of Tokyo)

Keywords:P/T boundary, C60 fullerene, growth mechanism

The P/T boundary is a cutting-edge topic not only in earth science but in nanoscience and materials science, ever since "C60 fullerene" was discovered in P/T boundary sections in the Inuyama area, central Japan in 1999. Since the formation of C60 fullerene molecules could only be achieved under somewhat restricted conditions such as imperfect combustion of unsaturated hydrocarbons, the founding of C60 molecules in any geological sections suggests the occurence, for exapmpe, of an anoxia triggered by wildfires. In fact, at the time of the C60 discovery in the Inuyama's P/T sections, we hypothsized that the C60 molecules were likely synthesized within locally anoxic zone in the extensive wildfires on the supercontinent Pangea and deposited on an anoxic deep-sea floor of the superocean Panthalassa.

Here, we report the discovery of C60 fullerene in Ubara P/T boundary sections in Hyogo Prefecture. Surprisingly, the amount of C60 found in these sections is more than two orders of magnitude larger than those found in the Inuyama P/T boundary. The presence of such a huge amount of C60 fullerene in the Ubara P/T boundary could not reasonably be explaied only by the extensive wildfires.