Arid
DOI10.1073/pnas.1204453109
Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago
Bunch, Ted E.1; Hermes, Robert E.3; Moore, Andrew M. T.2; Kennett, Douglas J.4; Weaver, James C.5; Wittke, James H.1; DeCarli, Paul S.6; Bischoff, James L.7; Hillman, Gordon C.8; Howard, George A.9; Kimbel, David R.10; Kletetschka, Gunther11,12; Lipo, Carl P.13; Sakai, Sachiko13; Revay, Zsolt14; West, Allen15; Firestone, Richard B.16; Kennett, James P.17,18
通讯作者Bunch, Ted E.
来源期刊PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
出版年2012
卷号109期号:28页码:E1903-E1912
英文摘要

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 format >2,200 degrees 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.


英文关键词tektite microcraters oxygen fugacity trinitite
类型Article
语种英语
国家USA ; England ; Czech Republic ; Germany
收录类别SCI-E
WOS记录号WOS:000306642100005
WOS关键词LIBYAN DESERT GLASS ; EXTRATERRESTRIAL IMPACT ; MURRAY SPRINGS ; BLACK MAT ; HYPOTHESIS ; SPHERULES ; TUNGUSKA ; EVENTS ; MEXICO
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
来源机构United States Geological Survey ; University of London
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174626
作者单位1.No Arizona Univ, Sch Earth Sci & Environm Sustainabil, Geol Program, Flagstaff, AZ 86011 USA;
2.Rochester Inst Technol, Coll Liberal Arts, Rochester, NY 14623 USA;
3.Los Alamos Natl Lab, Los Alamos, NM 87545 USA;
4.Penn State Univ, Dept Anthropol, University Pk, PA 16802 USA;
5.Harvard Univ, Wyss Inst Biol Inspired Engn, Cambridge, MA 02138 USA;
6.SRI Int, Menlo Pk, CA 94025 USA;
7.US Geol Survey, Menlo Pk, CA 94025 USA;
8.UCL, Inst Archaeol, London, England;
9.LLC, Raleigh, NC 27604 USA;
10.Kimstar Res, Fayetteville, NC 28312 USA;
11.Charles Univ Prague, Fac Sci, CR-11636 Prague 1, Czech Republic;
12.Acad Sci Czech Republic, Vvi, Inst Geol, Prague, Czech Republic;
13.Calif State Univ Long Beach, IIRMES, Long Beach, CA 90840 USA;
14.Tech Univ Munich, Forschungsneutronenquelle Heinz Maier Leibnitz FR, Munich, Germany;
15.GeoSci Consulting, Dewey, AZ 86327 USA;
16.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA;
17.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA;
18.Univ Calif Santa Barbara, Inst Marine Sci, Santa Barbara, CA 93106 USA
推荐引用方式
GB/T 7714
Bunch, Ted E.,Hermes, Robert E.,Moore, Andrew M. T.,et al. Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago[J]. United States Geological Survey, University of London,2012,109(28):E1903-E1912.
APA Bunch, Ted E..,Hermes, Robert E..,Moore, Andrew M. T..,Kennett, Douglas J..,Weaver, James C..,...&Kennett, James P..(2012).Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,109(28),E1903-E1912.
MLA Bunch, Ted E.,et al."Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 109.28(2012):E1903-E1912.
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