(Article of periodic en Anglais - 2014)

Document title

Recent developments in the analysis of the Black Mat Layer and cosmic impact at 12.8 ka

Authors(s) and Affiliation(s)

MAHANEY W.C. (1 2) ; KEISER L. (3) ; KRINSLEY D.H. (4) ; WEST A. (5) ; DIRSZOWSKY R. (6) ; ALLEN C.C.R. (7) ; COSTA P. (8 9) ;
(1) Quaternary Surveys, Ontario, Thornhill, CANADA
(2) Dept. of Geography, Univ. Ontario, York, CANADA
(3) Dept. of Geological Sciences, Univ. of Oklahoma, Norman, ETATS-UNIS
(4) Dep. of Geological Sciences, Univ. Oregon, Eugene, ETATS-UNIS
(5) GeoScience Consulting, Arizona, Dewey, ETATS-UNIS
(6) Dept. of Earth Science, Laurentian Univ., Ontario, Sudbury, CANADA
(7) Dept. of Biological Sciences, Queen's Univ., Belfast, ROYAUME-UNI
(8) Centro de Geologia, Fac. de Ciências, Univ., Lisboa, PORTUGAL
(9) Dept. of Geography, School of the Environment, Univ., Dundee, ROYAUME-UNI


New analytical databases reveal a corpus of data indicating that the cosmic impact was a real event, most possibly a cosmic airburst from Earth's encounter with the Taurid Complex comet or unknown asteroid, an event that led to cosmic fragments exploding interhemispherically over widely dispersed areas, including the northern Andes of Venezuela and the Alps on the Italian/French frontier. While the databases in the 2 areas differ somewhat, the overall interpretation is that microtextural evidence in weathering rinds and in sands of associated paleosols and glaciofluvial deposits carry undeniable attributes of melted glassy carbon and Fe spherules, planar deformation features, and impacted minerals of diverse lithologies. In concert with other black mat localities in the Western USA, the Netherlands, coastal France, Syria, Central Asia, Peru, Argentina and Mexico, it appears that a widespread cosmic impact by an asteroid or comet is responsible for deposition of the black mat at the onset of the Younger Dryas glacial event


Article of periodic

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2014, vol. 96, no1 [pp. 99-111]

Bibliographic references : 2 p.

Collation : 5 fig., 1 tabl.




Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/geoa.12033

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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