From the PNAS in 2012. This has the same Carbon-14 dating problem that everything else from that horizon has and there is a strong possibility that such an impact drastically altered the atmospheric balance of Carbon isotopes : PNAS July 10, 2012 vol. 109 no. 28 Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago
- Ted E. Buncha,1,
- Robert E. Hermesb,
- Andrew M.T. Moorec,
- Douglas J. Kennettd,
- James C. Weavere,
- James H. Wittkea,
- Paul S. DeCarlif,
- James L. Bischoffg,
- Gordon C. Hillmanh,
- George A. Howardi,
- David R. Kimbelj,
- Gunther Kletetschkak,l,
- Carl P. Lipom,
- Sachiko Sakaim,
- Zsolt Revayn,
- Allen Westo,
- Richard B. Firestonep, and
- James P. Kennettq
aGeology Program, School of Earth Science and Environmental Sustainability, Northern Arizona University, Flagstaff, AZ 86011;
bLos Alamos National Laboratory (retired), Los Alamos, NM 87545;
cCollege of Liberal Arts, Rochester Institute of Technology, Rochester, NY 14623;
dDepartment of Anthropology, Pennsylvania State University, University Park, PA 16802;
eWyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138;
fSRI International, Menlo Park, CA 94025;
gUS Geological Survey, Menlo Park, CA 94025;
hInstitute of Archaeology, University College London, London, United Kingdom;
iRestoration Systems, LLC, Raleigh, NC 27604;
jKimstar Research, Fayetteville, NC 28312;
kFaculty of Science, Charles University in Prague, and
lInstitute of Geology, Czech Academy of Science of the Czech Republic, v.v.i., Prague, Czech Republic;
mInstitute for Integrated Research in Materials, Environments, and Society (IIRMES), California State University, Long Beach, CA 90840;
nForschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, Munich, Germany;
oGeoScience Consulting, Dewey, AZ 86327;
pLawrence Berkeley National Laboratory, Berkeley, CA 94720; and
qDepartment of Earth Science and Marine Science Instititute, University of California, Santa Barbara, CA 93106
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Edited by* Steven M. Stanley, University of Hawaii, Honolulu, HI, and approved April 30, 2012 (received for review March 19, 2012)
Abstract
It has been proposed that fragments of an asteroid or comet impacted Earth, deposited silica-and iron-rich microspherules and other proxies across several continents, and triggered the Younger Dryas cooling episode 12,900 years ago. Although many independent groups have confirmed the impact evidence, the hypothesis remains controversial because some groups have failed to do so. We examined sediment sequences from 18 dated Younger Dryas boundary (YDB) sites across three continents (North America, Europe, and Asia), spanning 12,000 km around nearly one-third of the planet. All sites display abundant microspherules in the YDB with none or few above and below. In addition, three sites (Abu Hureyra, Syria; Melrose, Pennsylvania; and Blackville, South Carolina) display vesicular, high-temperature, siliceous scoria-like objects, or SLOs, that match the spherules geochemically. We compared YDB objects with melt products from a known cosmic impact (Meteor Crater, Arizona) and from the 1945 Trinity nuclear airburst in Socorro, New Mexico, and found that all of these high-energy events produced material that is geochemically and morphologically comparable, including: (i) high-temperature, rapidly quenched microspherules and SLOs; (ii) corundum, mullite, and suessite (Fe3Si), a rare meteoritic mineral that forms under high temperatures; (iii) melted SiO2 glass, or lechatelierite, with flow textures (or schlieren) that form at > 2,200 °C; and (iv) particles with features indicative of high-energy interparticle collisions. These results are inconsistent with anthropogenic, volcanic, authigenic, and cosmic materials, yet consistent with cosmic ejecta, supporting the hypothesis of extraterrestrial airbursts/impacts 12,900 years ago. The wide geographic distribution of SLOs is consistent with multiple impactors.
More associated references:
Origin and provenance of spherules and magnetic grains at the Younger Dryas boundary Proc. Natl. Acad. Sci. USA 2013 110 (38) E3557-E3566
Large Pt anomaly in the Greenland ice core points to a cataclysm at the onset of Younger Dryas Proc. Natl. Acad. Sci. USA 2013 110 (32) 12917-12920
Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago Proc. Natl. Acad. Sci. USA 2013 110 (23) E2088-E2097
Independent evaluation of conflicting microspherule results from different investigations of the Younger Dryas impact hypothesis Proc. Natl. Acad. Sci. USA 2012 109 (44) E2960-E2969
Source:
http://frontiers-of-anthropology.blogspot.com/2014/08/resource-younger-dryas-impact.html
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