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

Contributions to Mineralogy and Petrology

By:
, , and
DOI: 10.1007/BF00371979

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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