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FINAL REPORT ON A$sup 40$-K$sup 40$ DATING OF IGNEOUS AND METAMORPHIC ROCKS IN WESTERN MONTANA

Richard J. Hayden, John P. Wehrenberg

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Abstract

Igneous and metamorphic rocks from the major igneous Precambrian areas of western Montana were dated by Ar/sup 40/ -K/sup 40/ measurements obtained by use of the isotope dilution method. Data are tabulated. (C.H.)

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What this paper is about

Igneous and metamorphic rocks from the major igneous Precambrian areas of western Montana were dated by Ar/sup 40/ -K/sup 40/ measurements obtained by use of the isotope dilution method. Data are tabulated. (C.H.)

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Available abstract

Igneous and metamorphic rocks from the major igneous Precambrian areas of western Montana were dated by Ar/sup 40/ -K/sup 40/ measurements obtained by use of the isotope dilution method. Data are tabulated. (C.H.)

Key concepts: Igneous rock, Metamorphic rock, Precambrian, Geology, Geochemistry, Isotope dilution, Igneous petrology, Pluton

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