What question did this study set out to answer?

To investigate the variability of extraterrestrial 3He flux during the Triassic period as recorded in Japanese cherts.

May 13, 2026Proceedings of the Japan Academy Series B0 citationsOpen Access

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

TOTetsuji OnoueKyushu University KSKohei SetoyamaKyushu University HSHonami SatoKyushu University

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.

Abstract

He ratios, indicating a sudden influx of fine-grained extraterrestrial material. The timing of this excursion closely coincides with the Manicouagan impact event (215.4 Ma), suggesting a link between asteroid disruption and enhanced dust production during the Triassic.

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