Sr87/Sr86 ratios of Quaternary lavas of the Cascade Range, northern California
Bulletin of the Geological Society of America
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Abstract
Quaternary lavas from Mount Lassen, Mount Shasta, and Medicine Lake, which range in composition from olivine basalt to rhyolite, have Sr87/Sr86 values that fall between 0.7030 and 0.7043, corrected to 0.7080 for the Eimcr and Amend (MIT) SrCO3 standard. These values are very close to average (corrected) strontium isotopic values of some other circum-Pacific volcanic suites and of lavas of oceanic islands. The low ratios suggest a mantle origin. The notably high strontium content (1400 ppm) in the andesites from Mount Shasta also indicates a mantle origin at depths where plagioclase is absent as a stable phase in the residual material.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Sr87/Sr86 ratios of Quaternary lavas of the Cascade Range, northern California |
| Series title | Bulletin of the Geological Society of America |
| DOI | 10.1130/0016-7606(1970)81[311:SROQLO]2.0.CO;2 |
| Volume | 81 |
| Issue | 1 |
| Year Published | 1970 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 7 p. |
| First page | 311 |
| Last page | 317 |
| Country | United states |
| State | California |
| Other Geospatial | Cascade Range, Medicine Lake, Mount Lassen, Mount Shasta |
| Google Analytic Metrics | Metrics page |