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Bolide impact triggered the Late Triassic extinction event in equatorial Panthalassa.

ABSTRACT: Extinctions within major pelagic groups (e.g., radiolarians and conodonts) occurred in a stepwise fashion during the last 15 Myr of the Triassic. Although a marked decline in the diversity of pelagic faunas began at the end of the middle Norian, the cause of the middle Norian extinction is uncertain. Here we show a possible link between the end-middle Norian radiolarian extinction and a bolide impact. Two palaeoenvironmental events occurred during the initial phase of the radiolarian extinction interval: (1) a post-impact shutdown of primary and biogenic silica production within a time span of 10(4)-10(5) yr, and (2) a sustained reduction in the sinking flux of radiolarian silica for ~0.3 Myr after the impact. The catastrophic collapse of the pelagic ecosystem at this time was probably the dominant factor responsible for the end-middle Norian conodont extinction.

SUBMITTER: Onoue T

PROVIDER: S-EPMC4937377 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature

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Bolide impact triggered the Late Triassic extinction event in equatorial Panthalassa.

Onoue Tetsuji T Sato Honami H Yamashita Daisuke D Ikehara Minoru M Yasukawa Kazutaka K Fujinaga Koichiro K Kato Yasuhiro Y Matsuoka Atsushi A

Scientific reports 20160708

Extinctions within major pelagic groups (e.g., radiolarians and conodonts) occurred in a stepwise fashion during the last 15 Myr of the Triassic. Although a marked decline in the diversity of pelagic faunas began at the end of the middle Norian, the cause of the middle Norian extinction is uncertain. Here we show a possible link between the end-middle Norian radiolarian extinction and a bolide impact. Two palaeoenvironmental events occurred during the initial phase of the radiolarian extinction ...[more]

PMID: 27387863

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