| Seminar: | CPS Seminar |
| date: | 2017 March 23(Thu)16:00-17:30 |
| room: | CPS Seminar room |
| speaker: | Tetsuji Onoue (Kumamoto University Dept. of Earth & Environmental Sciences・Associate Professor) |
| organizer: | Yoshiyuki Hayashi |
| title: | Accretion of extraterrestrial matter and environmental changes recorded in the pelagic deep-sea deposits of Japan |
| abstract: | Permian to Jurassic bedded chert sequences in the Japanese accretionary complexes are recognized as pelagic deep-sea deposits and characterized by a very low sedimentation rate (less than a few millimeters per thousand years) and absence of coarse-grained terrigenous clastics. Owing to their low sedimentation rate and long-term continuous deposition, these bedded cherts could provide the accretion history of extraterrestrial matter over geologic time. In this talk, I will review studies of extraterrestrial matter in bedded chert sequences from the Jurassic accretionary complexes, southwest Japan. The following topics will be presented and discussed in the seminar: (1) The origin and significance of fossil micrometeorites found in the Triassic and Jurassic bedded cherts; (2) collapse of marine ecosystem triggered by a Late Triassic impact event. |
| keywords: | Permian, Triassic, accretionary complex, meteorite impact, micrometeorites |