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Sample 378
NavDat sample number 88036 · RHYODACITE
Sample
| Sample ID | 378 |
|---|
| Rock name | RHYODACITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Collected by | Hildreth and others |
|---|
| Comment | Dome with 250 m relief, intrudes and overlies ignimbrite near south-central margin of caldera |
|---|
Location
| Latitude | 48.81 |
|---|
| Longitude | -121.736 |
|---|
| Location | Oreamnos Dome |
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| State / province | Washington |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 1.127 |
|
1.116 |
1.138 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 70.8 | | WT% | XRF |
| TIO2 | 0.55 | | WT% | XRF |
| AL2O3 | 15.05 | | WT% | XRF |
| FEOT | 4.15 | | WT% | XRF |
| MNO | 0.08 | | WT% | XRF |
| MGO | 1.34 | | WT% | XRF |
| CAO | 1.25 | | WT% | XRF |
| NA2O | 3.82 | | WT% | XRF |
| K2O | 2.3 | | WT% | XRF |
| P2O5 | 0.23 | | WT% | XRF |
| LOI | 3.6 | | WT% | XRF |
| TOTAL | 95.44 | | WT% | XRF |
| RB | 33 | | PPM | XRF |
| SR | 289 | | PPM | XRF |
| Y | 182 | | PPM | XRF |
