stripes
Occurrence number:
025-00-078
Country:
Brazil
Region:
Rio de Janeiro
Location:
Longitude: -42.87, Latitude: -22.72
Carbonatite:
No
A small intrusion of volcanic breccia cuts Tertiary sediments of the Barreiras Formation. It contains small alkaline rock fragments 1-10 mm in diameter in a phonolitic matrix of orthoclase, nepheline, cancrinite, pyroxene and secondary calcite.
References:
LIMA, P.R.A. dos S. 1976. Geologia dos macicos alcalinos do estado do Rio de Janeiro. Semana de Estudos Geologicos, Itaguai: 205-59
Map:
Fig. 1_204 Distribution of alkaline rocks around Rio de Janeiro.
Location: