Analytical method: UNKNOWN
| Technique | UNKNOWN |
|---|---|
| Material | WHOLE ROCK |
| Mineral | none |
| Institution | UNIVERSITY OF CALIFORNIA - BERKELEY, DEPARTMENT OF GEOLOGY & GEOPHYSICS, BERKELEY, CA 94720, USA |
| Reference | Ferriz, Horacio; Mahood, Gail A (1987) Strong compositional zonation in a silicic magmatic system; Los Humeros, Mexican neovolcanic belt. Journal of Petrology. 28; 1, Pages 171-209. 1987. |