Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming
Contributions to Mineralogy and Petrology
By: Z. E. Peterman, B. R. Doe, and H.J. Prostka
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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 |
|---|---|
| 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 |