Sample 78-222
NavDat sample number 31682 · BASALT
Sample
| Sample ID | 78-222 |
|---|---|
| Rock name | BASALT |
| Rock type | VOLCANIC |
| Composition | MAFIC |
| Material | IGNEOUS |
| Comment | Andesite-dacite stratovolcano surrounded by a field of dacite domes and a basalt shield. |
Location
| Latitude | 36.0833 |
|---|---|
| Longitude | -114.833 |
| Location | River Mountains |
| State / province | Nevada |
| Volcanic field | Lake Mead area |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 12.75 | 12.1 | 13.4 |
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|---|---|---|---|
| SIO2 | 59 | WT% | ICP | |
| AL2O3 | 16.6 | WT% | ICP | |
| FEO | 6.9 | WT% | ICP | |
| CAO | 5.5 | WT% | ICP | |
| MGO | 2.6 | WT% | ICP | |
| NA2O | 3.9 | WT% | ICP | |
| K2O | 0.9 | WT% | ICP | |
| TIO2 | 2.3 | WT% | ICP | |
| MNO | 0.1 | WT% | ICP | |
| P2O5 | 0.6 | WT% | ICP | |
| SC | 11.2 | PPM | INAA | |
| HF | 7.3 | PPM | INAA | |
| TH | 14.9 | PPM | INAA | |
| TA | 1 | PPM | INAA | |
| LA | 81.7 | PPM | INAA | |
| CE | 167.9 | PPM | INAA | |
| SM | 8.7 | PPM | INAA | |
| EU | 2 | PPM | INAA | |
| YB | 2.3 | PPM | INAA | |
| LU | 0.4 | PPM | INAA | |
| SR | 959.65 | PPM | MS-ID | |
| RB | 83.62 | PPM | MS-ID | |
| ND | 54.9 | PPM | MS-ID | |
| ND143_ND144 | 0.51206 | MS | ||
| SR87_SR86_INITIAL | 0.7082 | MS | ||
| PB206_PB204 | 17.922 | MS | ||
| PB207_PB204 | 15.537 | MS | ||
| PB208_PB204 | 38.791 | MS |
References
- Feuerbach, Dan L; Smith, Eugene I; Walker, J D; Tangeman, J A (1993) The role of the mantle during crustal extension; constraints from geochemistry of volcanic rocks in the Lake Mead area, Nevada and Arizona. Geological Society of America Bulletin, vol.105, no.12, pp.1561-1575, Dec 1993 doi:10.1130/0016-7606(1993)105<1561:TROTMD>2.3.CO;2