Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Barra Do Pirai And Dos Tomazos

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Occurrence number: 
025-00-085
Country: 
Brazil
Region: 
Rio de Janeiro
Location: 
Longitude: -43.88, Latitude: -22.52
Carbonatite: 
No

Minor plugs and dykes of phonolite cut Precambrian gneisses; pseudoleucite-bearing rocks occur (J. G. Valenca, personal communication).

References: 
J. G. Valenca, unpublished dissertation and personal communication, 1980.
Map: 
Fig. 1_204 Distribution of alkaline rocks around Rio de Janeiro.
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith