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Sample N621
NavDat sample number 4989 · BASALT
Sample
| Sample ID | N621 |
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| Rock name | BASALT |
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| Rock type | VOLCANIC |
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| Composition | MAFIC |
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| Material | IGNEOUS |
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| Collected by | J.G. Quade, University of Nevada, Reno, and D.C. Noble, Michigan Tech University |
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| Comment | Two separate samples from the same flow are dated. The unit lies at the base of several thousand feet of andesites and marks the lower age limit for major calc-alkaline andesite eruptions in this part of the Sierra Nevada. |
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Location
| Latitude | 38.205 |
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| Longitude | -119.66 |
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| Location | Tuolumne County |
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| State / province | California |
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| Location comment | of Brown Bear Pass |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 19.6 |
|
18.8 |
20.4 |
|
M.L. Silberman, U.S. Geological Survey |
Analyses
No chemical analyses are stored for this sample.
References
- Morton, Janet L. and Silberman, Miles L. of the U.S. Geological Survey, Menlo Park; Bonham, H.F. and Garside, Larry J. of the Nevada Bureau of Mines and Geology, Reno; and Noble, Donald C. of the Michigan Technological University, Houghton (1977) K-AR AGES OF VOLCANIC ROCKS, PLUTONIC ROCKS, AND ORE DEPOSITS IN NEVADA AND EASTERN CALIFORNIA - DETERMINATIONS RUN UNDER THE USGS-NBMG COOPERATIVE PROGRAM.
