Upper Cenozoic basalts with high Sr87/Sr86 and Sr/Rb ratios, southern Great Basin, western United States
Bulletin of the Geological Society of America
By: Carl E. Hedge and Donald C. Noble
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Abstract
Upper Cenozoic basalts from southwestern Nevada and east-central California are unusually rich in both strontium (~ 1,200 ppm) and Sr87 (initial Sr87/Sr86 ~ 0.707). The average Rb/Sr ratio of these basalts is too low to have generated the observed Sr87/Sr86 ratio during the 4.6 b.y. of the Earth's existence, and the high strontium contents and low Rb/Sr ratios effectively rule out introduction to the basalts of the high Sr87/Sr86 values through contamination by more radiogenic material during ascent through the crust. Instead, the basalts must have been derived from unusual mantle material in which an originally high Rb/Sr ratio was markedly lowered during an earlier phase of magmatic activity.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Upper Cenozoic basalts with high Sr87/Sr86 and Sr/Rb ratios, southern Great Basin, western United States |
| Series title | Bulletin of the Geological Society of America |
| DOI | 10.1130/0016-7606(1971)82[3503:UCBWHS]2.0.CO;2 |
| Volume | 82 |
| Issue | 12 |
| Year Published | 1971 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 7 p. |
| First page | 3503 |
| Last page | 3509 |
| Country | United States |
| State | Arizona, California, Nevada, Utah |
| Other Geospatial | Great Basin |
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