stripes
Occurrence number:
025-00-058
Country:
Brazil
Region:
Minas Gerais
Location:
Longitude: -46.83, Latitude: -18.58
Carbonatite:
No
A small volcanic chimney cuts slates of the Bambui Group. Described as 'alkali olivine basalt', but contains perovskite, biotite (10%) and serpentine (35%), with some zeolite (Barbosa et al. 1970).
Age:
77.6±3.9 Ma by K-Ar on olivine basalt (Hasui and Cordani, 1968).
References:
BARBOSA, O., BRAUN, O.P.G., DYER, R.C. and CUNHA, C.A.B.R. da, 1970. Geologia da regiao do triangulo Mineiro. Boletim, Departamento Nacional de Producao Mineral. Divisao de Fomento da Producao Mineral. Rio de Janeiro, 136: 1-140.
HASUI, Y. and CORDANI, U.G. 1968. Idades potassio-argonio de rochas eruptivas Mesozoica do oeste mineiro e sul de Goias. Anais Congresso Brasileiro de Geologia, 22: 139-43
Location: