Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Evening Poster

B (Biogeosciences) » B-CG Complex & General

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

Mon. May 21, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, 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)

[BCG10-P05] Carbon-cycle perturbations in the deep Iapetus during the Great Ordovician Biodiversification Event

*Wataru Fujisaki1, Yohei Matsui1 (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:Great Ordovician Biodiversification Event (GOBE), organic carbon isotopes, deep-sea bedded cherts, Scotland

The Ordovician represents a period of major biospheric change in the Earth history, including a long-term biodiversification followed by a short-term extinction; the latter has been linked to a global cooling episode. The three-fold increase in biodiversity of throughout the Ordovician is known as the Great Ordovician Biodiversification Event (GOBE), which has been a focus of numerous paleo-environmental investigations in the fossiliferous shallow-marine strata deposited along continental margins. However, strata of deep-sea facies have not been focused in previous paleo-environmental studies, although they occupied extensive oceanic domains.
Deep-sea bedded cherts in the Ballantrae accretionary complex in SW Scotland is appropriate for checking the Ordovician extinction-related paleo-environmental information in the deep Iapetus Ocean. To examine the perturbations in C-cycle in the deep oceans during the GOBE, we preliminary report the organic carbon isotopic records from the Middle Ordovician deep-sea cherts at Bennane Head, Ballantrae Complex, SW Scotland.