stripes
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.
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
