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

Tetsuji Onoue, Naoto Takahata, Mitsutaka Miura, Honami Sato, Akira Ishikawa, Katsuhito Soda, Yuji Sano, Yukio Isozaki

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13 Citations (Scopus)


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. [Figure not available: see fulltext.].

Original languageEnglish
Article number18
JournalProgress in Earth and Planetary Science
Issue number1
Publication statusPublished - Dec 1 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)


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