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Sample MR-2
NavDat sample number 4977 · ANDESITE
Sample
| Sample ID | MR-2 |
|---|
| Rock name | ANDESITE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Collected by | H.F. Bonham, Nevada Bureau of Mines, D.I. Axelrod, University of California at Davis, D.C. Noble, Michigan Tech University, and M.L. Silberman, U.S.G.S. |
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| Comment | Hornblende andesite breccia; monolithologic blocks in matrix of the same material. The flow overlies gravelly tuffaceous sediments that contain plants. |
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Location
| Latitude | 38.5067 |
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| Longitude | -120.01 |
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| Location | Alpine County |
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| State / province | California |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 7.3 |
|
7 |
7.6 |
|
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.
