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Lead-alpha age determinations of granitic rocks from Alaska
John J. Matzko, H.W. Jaffe, C. L. Waring
1957, Trace Elements Investigations 618
Lead-alpha activity age determinations were made on zircon from seven granitic rocks of central and southeastern Alaska. The results of the age determinations indicate two periods of igneous intrusion, one about 95 million years ago, during the Cretaceous period, and another about 53 million years ago, during the early part...