Petrogenesis of melt rocks, Manicouagan impact structure, Quebec

Details Petrogenesis of melt rocks, Manicouagan impact structure, Quebec Petrogenesis of melt rocks, Manicouagan impact structure, Quebec

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2773s&link_type=abstract

Journal of Geophysical Research, vol. 83, June 10, 1978, p. 2773-2788.

Physics

20

Melting, Meteorite Craters, Meteoritic Damage, Mineralogy, Petrology, Breccia, Canada, Quartz, Shock Heating, Vertical Distribution

Scientific paper

It is suggested, on the basis of previous theoretical studies of shock waves, that the Manicouagan melt formed in 1 or 2 s in a 5-km-radius hemisphere near the point of impact. The melt and the less shocked debris surrounding it flowed downward and outward for a few minutes until the melt formed a lining of a 5- to 8-km deep, 15- to 22-km-radius cavity. Extremely turbulent flow thoroughly homogenized the melt and promoted the incorporation and progressive digestion of debris that had been finely fragmented (but not melted) to grain sizes of less than one mm by the passage of the shock waves. The equilibration of clasts and melt, plagioclase nucleation, and readjustment of the crater floor are discussed.

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