stripes
Occurrence number:
039-00-001
Country:
Costa Rica
Region:
Alajuela
Location:
Longitude: -84.38, Latitude: 9.95
Carbonatite:
No
In the vicinity of the village of Atenas along the Rio Grande de Tarcoles occurs a basanite flow associated with andesites, ignimbrites and tuffs. The rock is rich in phenocrysts of olivine (Fo85-70), augite and labradorite/bytownite in a matrix of plagioclase, opaques, augite, a little biotite and interstitial analcime.
References:
ROBIN, C. and TOURNON, J. 1978. Spatial relations of andesitic and alkaline provinces in Mexico and Central America. Canadian Journal of Earth Sciences, 15: 1633-41.
TOURNON, J. 1973. Presence de basaltes alcalins Recents au Costa Rica (Amerique Centrale). Bulletin Volcanologique, 36: 140-7
Location: