Alkaline Rocks and Carbonatites of the World

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San Andres-Tuxtla

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Occurrence number: 
108-00-017
Country: 
Mexico
Region: 
Vera Cruz
Location: 
Longitude: -95.02, Latitude: 18.03

The volcanic complex of San Andres-Tuxtla is some 50 km in diameter and dominated by an alkali basaltic series including picritic, basaltic, basanitic and hawaiitic types. Normative nepheline is usual but modal nepheline relatively rare (Robin, 1982, p. 25 and p. 461, no. VE 127).

Age: 
Quaternary.
References: 
ROBIN, C. 1982. Relations volcanologie - magmatologie - geodynamique: application au passage entre volcanismes alcalin et andesitique dans le sud Mexicain. Annales Scientifiques de l'Universite de Clermont-Ferrand II: Geologie Mineralogie, 70: 1-503
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith