Mathematics – Logic
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.327..612j&link_type=abstract
Nature (ISSN 0028-0836), vol. 327, June 18, 1987, p. 612-614. Research supported by the Geological Survey of Canada, EMR, and NS
Mathematics
Logic
14
Comet Nuclei, Meteorite Craters, Meteorites, Planetary Craters, Breccia, Extraterrestrial Matter, Impact Damage, Iridium, Earth, Impacts, Impact Craters, Position (Location), Description, Melts, Meteorites, Structure, Breccia, Shock Effects, Deformation, Features, Characteristics, Enrichment, Siderophiles, Iridium, Origin, Formation, Stony Meteorites, Comet Nuclei, Size, Diameter, Diagrams, Chemistry, Samples, Terrestrial, Field Studies, Photomicrographs, Stratigraphy
Scientific paper
The identification of an underwater extraterrestrial impact crater on the North Atlantic continental shelf, 200 km south-east of Nova Scotia, Canada, is reported. The impact, in early Eocene time, produced a complex structure with a submarine crater, a central structural high and an inner topographic ring. The crater is filled with breccia, which exhibits shock deformation features. Lack of enrichment of the melt rocks in siderophile elements compared with basement rocks and a slight enrichment in iridium, suggest that the impactor was either a stony meteorite or a cometary nucleus. The diameter of the impactor is estimated to be 2-3 km.
Jansa L. F.
Pe-Piper Georgia
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