Extraterrestrial 3He flux variability during the Triassic recorded in pelagic bedded cherts of Japan

Key Points

• To investigate the variability of extraterrestrial 3He flux during the Triassic period as recorded in Japanese cherts.
• Analysis of pelagic bedded cherts from Japan
• Measurement of He ratios to assess extraterrestrial material influx
• Correlation of data with the Manicouagan impact event
• Identification of a sudden influx of fine-grained extraterrestrial material indicated by He ratios
• Timing of this event closely aligns with the Manicouagan impact (215.4 Ma)
• Establishment of a potential link between asteroid disruption and increased dust production during the Triassic.