Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming
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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.
Study Area
Publication type | Article |
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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 |
Description | 10 p. |
First page | 121 |
Last page | 130 |
Country | United States |
State | Wyoming |
Other Geospatial | Absaroka volcanic field |
Google Analytic Metrics | Metrics page |