Physics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...255..443b&link_type=abstract
Science (ISSN 0036-8075), vol. 255, Jan. 24, 1992, p. 443-446. Research supported by Petroleum Research Fund, W. Keck Foundation
Physics
23
Mesozoic Era, Metamorphism (Geology), Meteorite Collisions, Petrology, Quartz, Crystallography, Extinction, Italy, Shales
Scientific paper
Quartz grains that appear to have been shock-metamorphosed occur within three closely spaced shale beds from the uppermost Triassic ('Rhaetian') Calcare a Rhaetavicula in the Northern Apennines of Italy. The upper shale coincides with the abrupt termination of the distinctive, uppermost Triassic Rhaetavicula fauna and is overlain by the Hettangian (Lower Jurassic) Calcare Massiccio; no extinctions appear to be associated with the two lower layers, which occur 1.2 and 2.4 meters below the boundary shale. Approximately 5 to 10 percent of the quartz grains within these layers exhibit one or more sets of planar deformational features whose orientations cluster around the rational crystallographic planes (basal, omega, and pi) most commonly observed in shocked quartz. Textural and stratigraphic observations support an interpretation of at least three closely spaced impacts at the end of the Triassic.
Bice David M.
McCauley S.
McRoberts C. A.
Newton Robert C.
Reiners Peter W.
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