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Science 20 November 1964:
Vol. 146. no. 3647, pp. 1049 - 1053
DOI: 10.1126/science.146.3647.1049-a
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Articles

Rubidium-Strontium Isochron Study of the Grenville Front near Lake Timagami, Ontario

James A. Grant 1

1 Division of Geological Sciences, California Institute of Technology, Pasadena, California

Rubidium-strontium isotopic analyses of whole-rock samples and of constituent minerals from a suite of rocks taken across the Grenville Front demonstrate that granitic rocks of the Superior province, with a primary age of approximately 2.4 billion years, and older metasedimentary rocks were reconstituted during Grenville metamorphism, at approximately 930 million years, and now form part of the Grenville province.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)