Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming

Contributions to Mineralogy and Petrology
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Abstract

The Absaroka volcanic field is comprised of predominant andesitic volcaniclastic rocks and less abundant potassium-rich mafic lavas (shoshonites and absarokites). Strontium and lead isotopic variations preclude a simple derivation from an isotopically uniform source: Sr87/Sr86, 0.7042 to 0.7090; Pb206/Pb204, 16.31 to 17.30; Pb208/Pb204, 36.82 to 37.64. We postulate that these rocks were derived from a lower crust or upper mantle which underwent a preferential loss of uranium relative to lead approximately 2800??200 m.y. ago. Variations in lead and strontium isotopic compositions are thought to reflect small inhomogeneities in U/Pb and Rb/Sr ratios in the source. ?? 1970 Springer-Verlag.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming
Series title Contributions to Mineralogy and Petrology
DOI 10.1007/BF00371979
Volume 27
Issue 2
Year Published 1970
Language English
Publisher Springer-Verlag
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Contributions to Mineralogy and Petrology
First page 121
Last page 130
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