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Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming (1970)

Peterman, Zell E. ; Doe, Bruce R. ; Prostka, Harold J.

Springer

Contributions to mineralogy and petrology 27 (1970), S. 121-130

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00371979

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