Alkaline Rocks and Carbonatites of the World

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Catalao Ii


Occurrence number: 
Longitude: -47.87, Latitude: -18.03

Catalao II lies 15 km north of Catalao I and detailed descriptions are not readily accessible. It forms a circular dome with an approximate area of 14 km2, with a strong aeromagnetic expression. The country rocks are Precambrian quartzites and schists which are fenitized. The principal rock types of the intrusion are sovites, phoscorites and glimmerites. The carbonatites comprise calcite, phlogopite, vermiculite and a range of accessory minerals including alkali feldspar, magnetite, baryte, pyrochlore, sodic amphibole and RE phosphates.

Ba-pyrochlore is concentrated in a lateritic mantle which averages 2.18% Nb2O5; estimated reserves are 2 million tons.
CARVALHO, W.T. de, 1974a. Aspectos geologicos e petrograficos do complexo ultramafico-alcalino de Catalao I, Go. Anais Congresso Brasileiro de Geologia, 28: 107-23. RODRIGUES, C. de S. and LIMA, P.R.A. dos S. 1984. Carbonatitic complexes in Brazil. Companhia Brasileira de Metalurgia e Mineracao: 1-17
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