Alkaline Rocks and Carbonatites of the World

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

Passa Quatro

stripes

Occurrence number: 
025-00-089
Country: 
Brazil
Region: 
Minas Gerais and Sao Paulo
Location: 
Longitude: -44.83, Latitude: -22.4
Carbonatite: 
No

This is an elliptical intrusion of 18x8 km, covering 110 km2 and lying only 1 km southwest of Itatiaia (Figs 2_204 and 2_210). It is probably a multiple intrusion but has not been mapped in detail. It is not well known but includes various types of nepheline syenite which are similar to those of Itatiaia (025-00-088).

Age: 
65 Ma (Ribeiro Filho and Cordani, 1966 quoted in Asmus, 1978).
References: 

ASMUS, H.E. 1978. Hipoteses sobre a origem dos sistemas de zonas de fratura oceanicas alinhamentos continentais que ocorrem nas regioes sudeste e sul do Brasil. In. Petrobras. Aspectos estruturais da margem continental leste e sudeste do Brasil. CENPES/DINTEP, Rio de Janeiro (Serie Projeto Remac, no. 4): 39-73.
PENALVA, F. 1967. Geologia e tectonica da regiao do Itatiaia. Boletim da Faculdade de Filosofia, Ciencias e Letras, Universidade de Sao Paulo, Geologia, 302(22): 95-196.
RIBEIRO FILHO, E. 1967. Geologia e petrologia dos macicos alcalinas do Itatiaia e Passa-Quatro. Boletim da Faculdade de Filosofia, Ciencias e Letras, Universidade de Sao Paulo, Geologia, 302(22): 1-93

Map: 
Fig. 1_204 Distribution of alkaline rocks around Rio de Janeiro. and Fig. 1_210 Itatiaia (after Ribeiro Filho, 1967).
Location: 
All locations > South America > Brazil > Minas Gerais and Sao Paulo
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith