Ages in the Precambrian Terrane of Death Valley, California

Creators: Wasserburg, G. J.; Wetherill, G. W.; Wright, Lauren A.

Abstract

The Sr⁸⁷-Rb⁸⁷ and A⁴⁰-A⁴⁰ ages of minerals contained in three pre-Pahrump igneous and metamorphic rocks were determined. The results indicate an event at 1.7 X 10⁹ years. Since the rock types investigated have distinct continental affinities, it is concluded that continental growth has not occurred in this area since that time. Concordant ages obtained on two rocks gave results in disagreement with the observed field relationships.

Additional Information

This work was supported in part by a National Science Foundation grant. The authors are indebted to C. R. Allen, R. H. Engel, A. E. J. Jahns, and L. T. Silver for many critical observations and stimulating discussions. The help of John Wilson in determining the modal analyses and of John Doak for maintenance of the mass spectrometer is greatly appreciated.

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Ages in the Precambrian Terrane of Death Valley, California

Abstract

Additional Information

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