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Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C
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SYSNO ASEP 0524947 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C Author(s) Moore, A. M. T. (US)
Kennett, J. P. (US)
Napier, W. M. (GB)
Bunch, T. E. (US)
Weaver, J. C. (US)
LeCompte, M. A. (US)
Adedeji, V. (US)
Hackley, P.C. (US)
Kletetschka, Günther (GLU-S) RID, SAI, ORCID
Hermes, R. E. (US)
Wittke, J. H. (US)
Razink, J. J. (US)
Gaultois, M. W. (GB)
West, A. (US)Article number 4185 Source Title Scientific Reports. - : Nature Publishing Group - ISSN 2045-2322
Roč. 10, č. 1 (2020)Number of pages 22 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords Younger Dryas Boundary ; Airburst ; Magnetism ; Impact ; culture transition Subject RIV DB - Geology ; Mineralogy OECD category Geology Method of publishing Open access Institutional support GLU-S - RVO:67985831 UT WOS 000529485400001 EID SCOPUS 85081527922 DOI 10.1038/s41598-020-60867-w Annotation At Abu Hureyra (AH), Syria, the 12,800-year-old Younger Dryas boundary layer (YDB) contains peak abundances in meltglass, nanodiamonds, microspherules, and charcoal. AH meltglass comprises 1.6 wt.% of bulk sediment, and crossed polarizers indicate that the meltglass is isotropic. High YDB concentrations of iridium, platinum, nickel, and cobalt suggest mixing of melted local sediment with small quantities of meteoritic material. Approximately 40% of AH glass display carbon-infused, siliceous plant imprints that laboratory experiments show formed at a minimum of 1200°–1300 °C, however, reflectance-inferred temperatures for the encapsulated carbon were lower by up to 1000 °C. Alternately, melted grains of quartz, chromferide, and magnetite in AH glass suggest exposure to minimum temperatures of 1720 °C ranging to >2200 °C. This argues against formation of AH meltglass in thatched hut fires at 1100°–1200 °C, and low values of remanent magnetism indicate the meltglass was not created by lightning. Low meltglass water content (0.02–0.05% H2O) is consistent with a formation process similar to that of tektites and inconsistent with volcanism and anthropogenesis. The wide range of evidence supports the hypothesis that a cosmic event occurred at Abu Hureyra ~12,800 years ago, coeval with impacts that deposited high-temperature meltglass, melted microspherules, and/or platinum at other YDB sites on four continents. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2021 Electronic address https://www.nature.com/articles/s41598-020-60867-w
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