Other
Scientific paper
Jun 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29..673p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 6, pp.673-709
Other
5
Scientific paper
Analyses for major elements and nine trace elements are given for seventy anorthositic rocks collected from the Morin pluton near Montreal, eight other bodies of anorthosite in Quebec and one in New York. The relationships of major and minor elements in anorthosites are discussed. The following average amounts of some trace elements in anorthositic rocks have been computed (in ppm): An average composition of the Morin pluton has been computed from analyses of various parts of the pluton. The study of trace elements indicates that the diversity of rock types in the western part of the Morin pluton (the "Mauve facies") is due to magmatic differentiation proceeding towards enrichment in iron. The eastern part of the pluton (the "Chertsey facies") differs chemically from the Mauve type; it is believed to represent a separate intrusion, possibly modified chemically by an intense dynamic stress. Several smaller bodies of anorthositic rocks to the south of the Morin area are chemically similar to the geographically closest parts of the Morin pluton, indicating that a buried part of the pluton extends to the south for at least 20 miles. One of the small bodies of anorthosite was found by deep drilling under 3100 feet of Paleozoic sediments.
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