演題概要

オーラルセッション

第3日 5月16日(金) 9:40~10:00 C会場(星雲2)

生物大量絶滅に関わる環境変動の解析: 軽元素安定同位体比分析によるアプローチ

(筑波大院生命環境)
o丸岡照幸上松佐知子指田勝男

Mass extinction is a decline of biodiversity at which exceptionally large numbers of species of the global biota go extinct simultaneously within a relatively short period of geological time. The following catastrophic events are proposed as the triggers that can induce mass extinction; (a) massive volcanism, such as continental flood and oceanic plateau volcanism, (b) impact of extraterrestrial material, and (c) increase of cosmic ray flux by astronomical events, such as supernovae, gamma-ray bursts and encounters with spiral arms. We briefly review stable isotope studies to infer the trigger for a specific mass extinction event and its subsequent environmental perturbations.