Reports

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

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Science  20 Nov 1964:
Vol. 146, Issue 3647, pp. 1049-1053
DOI: 10.1126/science.146.3647.1049-a

Abstract

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.