Multiple isotopic components in Quaternary volcanic rocks of the Cascade Arc near Crater lake, Oregon
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Abstract
Quaternary lavas and pyroclastic rocks of Mount Mazama, Crater lake caldera, and the surrounding area have variable Sr, Nd, and Pb isotopic compositions. High-alumina olivine tholeiites have 87Ar/86Ar ratios of 0.70346-0.70364; basaltic andesite, 0.70349-0.70372; shoshonitic basaltic andesite, 0.70374-0.70388; and andesite, 0.70324-0.70383. Dacites of Mount Mazama have 87Sr/ 86Sr ratios of 0.70348-0.70373. Most rhyodacites converge on 0.7037. Andesitic to mafic-cumulate scoriae of the climatic eruption, and enclaves in pre-climactic rhyodacites, cluster in two groups but show nearly the entire 87Sr/86Sr range of the data set, confirming previously suggested introduction of diverse parental magmas into the growing climactic chamber. Magma evolution is described.
Suggested Citation
Bacon, C., Gunn, S., Lanphere, M.A., Wooden, J.L., 1994, Multiple isotopic components in Quaternary volcanic rocks of the Cascade Arc near Crater lake, Oregon: Journal of Petrology, v. 35, no. 6, p. 1521-1556, https://doi.org/10.1093/petrology/35.6.1521.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Multiple isotopic components in Quaternary volcanic rocks of the Cascade Arc near Crater lake, Oregon |
| Series title | Journal of Petrology |
| DOI | 10.1093/petrology/35.6.1521 |
| Volume | 35 |
| Issue | 6 |
| Year Published | 1994 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Volcano Science Center |
| Description | 36 p. |
| First page | 1521 |
| Last page | 1556 |
| Country | United States |
| State | Oregon |