| 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. |
| Genre: | Article |
| ProdID: | 70001637 |
| Citation Author: | Peterman, Z. E.; Doe, B. R.; Prostka, H. J. |
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| Citation End Page: | 130 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Contributions to Mineralogy and Petrology |
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| Citation Publisher: | Springer-Verlag |
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| Citation Search Results Text: | Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming; 1970; Article; Journal; Contributions to Mineralogy and Petrology; Peterman, Z. E.; Doe, B. R.; Prostka, H. J. |
| Citation Start Page: | 121 |
| Citation Volume: | 27 |
| Citation Year: | 1970 |
| Type: | citation/reference |
| Text: | Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming; 1970; Article; Journal; Contributions to Mineralogy and Petrology; Peterman, Z. E.; Doe, B. R.; Prostka, H. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1007/BF00371979 |
| Date Other: | Tue, 28 Sep 2010 23:09 -0500 |
| Publisher: | Springer-Verlag |
