Physics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74..338a&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 74, no. 4, Aug. 1985, p. 338-346. NASA-supported research.
Physics
9
Anorthosite, Geochronology, Geology, Isotopes, Metamorphism (Geology), Neodymium Isotopes, Ontario, Rocks, Rubidium Isotopes, Samarium Isotopes, Strontium Isotopes
Scientific paper
Sm-Nd and Rb-Sr isotopic data for the Bad Vermilion Lake anorthosite in the Rainy Lake area of the Superior Province of northwesten Ontario show that direct ages of Archean anorthosites can be obtained with these isotopic systems despite the effects of low-grade metamorphism. There is sufficient spread in Sm/Nd between plagioclase megacrysts and coexisting mafic groundmass to allow the determination of reasonably precise internal Sm-Nd isochrons. Initial isotopic ratios of Nd and Sr add to the growing body of data indicating the Superior Province is underlain by depleted mantle.
Ashwal Lewis D.
Morrison David A.
Phinney William C.
Wooden Joseph L.
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