Computer Science
Scientific paper
Jan 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28...87c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 1, pp.87-90
Computer Science
13
Scientific paper
U-Pb and K-Ar isotopic age analyses were performed on zircon, monazite, biotite and hornblende samples from the Little Belt and Beartooth Mountains of Montana, and the Catalina Mountains of Arizona. In the Little Belt Mountains, three events were dated: formation or resetting of zircons 2500 m.y. ago; metamorphism, 1920 m.y. ago; and intrusion of Laramide porphyries, 120 m.y. ago. In the Beartooth Mountains, the results indicate that the detrital zircons found in the Precambrian metasedimentary rocks are more than 3100 m.y. old. In the Catalina Mountains, the results suggest that the Catalina gneiss was initially formed ~1650 m.y. ago and was remetamorphosed 30-40 m.y. ago. The zircons from all three areas give highly discordant isotopic ages. The discordances can be accounted for by either episodic lead loss or isotopic fractionation followed by ground water removal, but are incompatible with the hypothesis that continuous diffusion is the predominant mechanism.
Catanzaro E. J.
Kulp Laurence J.
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