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A 12,800-year-old layerwith cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bayстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 24 сентября 2025 г.
- Авторы: Moore C.R., Tselmovich V.A., LeCompte M.A., West A., Culver S.J., Mallinson D.J., et al.
- Журнал: PLoS ONE
- Том: 20
- Номер: 8
- Год издания: 2025
- Издательство: Public Library of Science
- Местоположение издательства: United States
- Первая страница: 1
- Последняя страница: 29
- DOI: 10.1371/journal.pone.0328347
- Аннотация: The Younger Dryas Impact Hypothesis (YDIH) posits that ~12,800 years ago Earth encountered the debris stream of adisintegrating comet, triggering hemisphere-wide airbursts, atmospheric dust loading, and the deposition of a distinctive suite ofextraterrestrial (ET) impact proxies at the Younger Dryas Boundary (YDB). Until now, evidence supporting this hypothesis has comeonly from terrestrial sediment and ice-core records. Here we report the first discovery of similar impact-related proxies in oceansediments from four marine cores in Baffin Bay that span the YDB layer at water depths of 0.5–2.4 km, minimizing the potential formodern contamination. Using scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) and laser ablationICP-MS, we detect synchronous abundance peaks of metallic debris geochemically consistent with cometary dust, co-occurringwith iron- and silica-rich microspherules (4–163 μm) that are predominantly of terrestrial origin with minor (<2 wt%) ETcontributions. These microspherules were likely formed by low-altitude touchdown airbursts and surface impacts of cometfragments and were widely dispersed. In addition, single-particle ICP-TOF-MS analysis reveals nanoparticles (<1 μm) enriched inplatinum, iridium, nickel, and cobalt. Similar platinum-group element anomalies at the YDB have been documented at dozens ofsites worldwide, strongly suggesting an ET source. Collectively, these findings provide robust support for the YDIH. The impactevent likely triggered massive meltwater flooding, iceberg calving, and a temporary shutdown of thermohaline circulation,contributing to abrupt Younger Dryas cooling. Our identification of a YDB impact layer in deep marine sediments underscores thepotential of oceanic records to broaden our understanding of this catastrophic event and its climatological impacts.
- Добавил в систему: Цельмович Владимир Анатольевич