Analytical method: UNKNOWN
| Technique | UNKNOWN |
|---|---|
| Material | WHOLE ROCK |
| Mineral | none |
| Institution | Unknown, Unknown, USA |
| Reference | Luhr, J F; Lazaar, P (1985) The southern Guadalajara volcanic chain, Jalisco, Mexico. Geofisica Internacional. 24; 4, Pages 691-700. 1985. |