日本地球惑星科学連合2018年大会

講演情報

[JJ] Eveningポスター発表

セッション記号 B (地球生命科学) » B-CG 地球生命科学複合領域・一般

[B-CG10] 顕生代生物多様性の変遷:絶滅と多様化

2018年5月21日(月) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:磯崎 行雄(東京大学大学院総合文化研究科広域科学専攻広域システム科学系)、澤木 佑介(東京大学大学院総合文化研究科)

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

*藤崎 渉1松井 洋平1 (1.国立研究開発法人海洋研究開発機構)

キーワード:オルドビス紀生物多様性イベント、有機炭素同位体比、深海チャート、スコットランド

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.