Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2761g&link_type=abstract
Journal of Geophysical Research, vol. 83, June 10, 1978, p. 2761-2771.
Physics
19
Bedrock, Chemical Composition, Melting, Meteorite Craters, Meteoritic Damage, Mineralogy, Canada, Lithology, Petrology, Rocks
Scientific paper
The basement rocks of Manicouagan exhibit a wide compositional range (40-72% SiO2). Least squares mixing calculations indicate that the average composition of the Manicouagan melt sheet can be modeled for 9 major and 11 trace elements by a mixture of 4.5% anorthosite, 55.5% mafic gneiss, and 40.0% tan gneiss with a granitic-granodioritic composition. The underrepresentation of anorthosite relative to its present distribution is considered. The homogeneous composition of the melt (57.75 + or - 1.21% SiO2) relative to that of the postulated target is explained in a model outlining the dynamic conditions existing during the formation of the melt and its accompanying movement into the excavated cavity.
Floran R. J.
Grieve Richard A. F.
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