Enhanced flux of extraterrestrial 3He across the Permian–Triassic boundary

The ca 252 Ma Permian–Triassic boundary (PTB) represents the most severe mass extinction event of the Phanerozoic, with the disappearance of ~ 80% of marine invertebrate species. Large-scale eruption of the Siberian Traps is the commonly favored cause, although the link between volcanism and extinct...

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Bibliographic Details
Published in:Progress in earth and planetary science 2019-02, Vol.6 (1), p.1-12, Article 18
Main Authors: Onoue, Tetsuji, Takahata, Naoto, Miura, Mitsutaka, Sato, Honami, Ishikawa, Akira, Soda, Katsuhito, Sano, Yuji, Isozaki, Yukio
Format: Article
Language:English
Subjects:
6. Interdisciplinary research
Asteroids
Atmospheric Sciences
Bedded chert
Biogeosciences
Deep sea
Dust
Dust particles
Earth and Environmental Science
Earth Sciences
Extinction
Geophysics/Geodesy
Helium
Hydrogeology
Inner solar system
Interplanetary dust
Marine invertebrates
Mass extinctions
Mino Belt
Permian
Planetology
Platinum group element
Research Article
Stratigraphy
Triassic
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Summary:The ca 252 Ma Permian–Triassic boundary (PTB) represents the most severe mass extinction event of the Phanerozoic, with the disappearance of ~ 80% of marine invertebrate species. Large-scale eruption of the Siberian Traps is the commonly favored cause, although the link between volcanism and extinction remains debated. Here, we report evidence for an extraterrestrial 3 He influx in the PTB section of deep-sea bedded cherts from Japan. This unusual signal indicates a significant increase in the influx of interplanetary dust particles, likely related to an asteroid shower in the inner solar system. High-resolution stratigraphy indicates that the peak flux of dust particles occurred during the final 500 kyr of the Permian, concurrent with a pre-extinction decline in radiolarian diversity.
ISSN:2197-4284
2197-4284
DOI:10.1186/s40645-019-0267-0