Manicouagan impact melt, Quebec. I - Stratigraphy, petrology, and chemistry

Details Manicouagan impact melt, Quebec. I - Stratigraphy, petrology, and chemistry Manicouagan impact melt, Quebec. I - Stratigraphy, petrology, and chemistry

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2737f&link_type=abstract

Journal of Geophysical Research, vol. 83, June 10, 1978, p. 2737-2759.

Physics

40

Chemical Analysis, Meteorite Craters, Meteoritic Damage, Mineralogy, Petrology, Stratigraphy, Canada, Melting, Photogeology

Scientific paper

A sheet of clast-laden impact melt 230 m thick and 55 km in diameter forms an annular plateau surrounding an uplift of shocked anorthosite within the moderately eroded Manicouagan structure. Three gradational units of the melt sheet are characterized with respect to grain size, inclusions, texture, and mineralogy. The melt rocks as a group are chemically homogeneous with a bulk composition similar to that of latite and with no statistically significant regional chemical variations. The melt is not completely chemically homogeneous as a local mafic variant represented by two samples with poikilitic texture was found. These poikilitic rocks texturally resemble some Apollo 17 impact melt rocks and are inferred to have had a similar origin and thermal history.

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