Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

B (Biogeosciences) » B-CG Complex & General

[B-CG09] Decoding the history of Earth: From Hadean to the present

Mon. May 21, 2018 3:30 PM - 5:00 PM Convention Hall B (CH-B) (2F International Conference Hall, Makuhari Messe)

convener:Tsuyoshi Komiya(Department of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo), Yasuhiro Kato(Department of Systems Innovation, Graduate School of Engineering, University of Tokyo), Katsuhiko Suzuki(国立研究開発法人海洋研究開発機構・海底資源研究開発センター), Chairperson:Komiya Tsuyoshi

3:30 PM - 3:45 PM

[BCG09-01] Pseudo-supercontinent Pangea; what is true super-continent?

*Shigenori Maruyama1, Inna Safonova2, M Santosh3 (1.Earth-Life Science Institute, Tokyo Institute of Technology, 2.Novosibirsk State University, 3.China University of Geosciences)

Keywords:Pangea, Supercontinent

Supercontinent Pangea played a critical role for the idea of continental drift, and led an establishment of plate tectonics through ocean-floor spreading. The definition of supercontinent is to one huge continent formed by connecting all continents with each other.

In addition, the Miocene Earth must have been a supercontinent, because all continents were connected together, at least continental crusts centered in Asia with Africa, Saudi-Arabia, Australia, N. America, S. America together with middle America, and Antarctica with S. America through small island arc called Georgia arc (?).

After the period of establishment of plate tectonics, the mechanical process to form a supercontinent has been argued, and was proposed the process of supercontinent formation by TTT junctions to swallow continents through time. If we follow the process, Pangea and Miocene Earth are not the true supercontinent, because it was an apparent stage to lead final supercontinent Amasia ca.250 m.y. after the present.