Alkaline Rocks and Carbonatites of the World

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Corrego Dos Bois (Rio Dos Bois)

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Occurrence number: 
025-00-048
Country: 
Brazil
Region: 
Goias
Location: 
Longitude: -51.13, Latitude: -16.28

Corrego dos Bois is a complex intrusion of the Ipora Group, 5 km in diameter and covering 20 km2, emplaced in Precambrian granites and migmatites. It has a border zone of pyroxenites, peridotites, theralites and essexites around a large dunitic core; there are subordinate nepheline syenites. The dunites are granular olivine rocks with seams of opaques and with a little augite, biotite, zeolite, plagioclase and (?)sodalite. The essexites, apart from labradorite, Ti-augite and a magnesian olivine, contain orthoclase, nepheline, sodalite, biotite, hornblende, cancrinite and opaques.

References: 
PENA, G.S. and FIGUEIREDO, A.J.A. 1975. Projeto Goiama II, relatorio final. Departamento Nacional da Producao Mineral. Companhia de Pesquisa de Recursos Minerais, 1: 121-61. DANNI, J.C.M. 1978. Magmatic differentiation of the alkaline-ultrabasic intrusions of the Ipora region, south west Goias, Brazil.In. Proceedings of the First International Symposium on Carbonatites, Pocos de Caldas: 149-67
Fig. 196 The Ipora Group of occurrences of alkaline intrusions of central Goias.
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith