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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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C Tvůrce(i) 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)Číslo článku 4185 Zdroj.dok. Scientific Reports. - : Nature Publishing Group - ISSN 2045-2322
Roč. 10, č. 1 (2020)Poč.str. 22 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Younger Dryas Boundary ; Airburst ; Magnetism ; Impact ; culture transition Vědní obor RIV DB - Geologie a mineralogie Obor OECD Geology Způsob publikování Open access Institucionální podpora GLU-S - RVO:67985831 UT WOS 000529485400001 EID SCOPUS 85081527922 DOI 10.1038/s41598-020-60867-w Anotace 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. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2021 Elektronická adresa https://www.nature.com/articles/s41598-020-60867-w
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