NDLI: Deep-sea record of impact apparently unrelated to mass extinction in the Late Triassic

Content Provider	PubMed Central
Author	Onoue, Tetsuji Sato, Honami Nakamura, Tomoki Noguchi, Takaaki Hidaka, Yoshihiro Shirai, Naoki Ebihara, Mitsuru Osawa, Takahito Hatsukawa, Yuichi Toh, Yosuke Koizumi, Mitsuo Harada, Hideo Orchard, Michael J. Nedachi, Munetomo
Abstract	The 34-million-year (My) interval of the Late Triassic is marked by the formation of several large impact structures on Earth. Late Triassic impact events have been considered a factor in biotic extinction events in the Late Triassic (e.g., end-Triassic extinction event), but this scenario remains controversial because of a lack of stratigraphic records of ejecta deposits. Here, we report evidence for an impact event (platinum group elements anomaly with nickel-rich magnetite and microspherules) from the middle Norian (Upper Triassic) deep-sea sediment in Japan. This includes anomalously high abundances of iridium, up to 41.5 parts per billion (ppb), in the ejecta deposit, which suggests that the iridium-enriched ejecta layers of the Late Triassic may be found on a global scale. The ejecta deposit is constrained by microfossils that suggest correlation with the 215.5-Mya, 100-km-wide Manicouagan impact crater in Canada. Our analysis of radiolarians shows no evidence of a mass extinction event across the impact event horizon, and no contemporaneous faunal turnover is seen in other marine planktons. However, such an event has been reported among marine faunas and terrestrial tetrapods and floras in North America. We, therefore, suggest that the Manicouagan impact triggered the extinction of terrestrial and marine organisms near the impact site but not within the pelagic marine realm.
Related Links	http://dx.doi.org/10.1073/pnas.1209486109
Ending Page	19139
Page Count	6
Starting Page	19134
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	47
Volume Number	109
Language	English
Publisher	National Academy of Sciences
Publisher Date	2012-11-20
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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