Alkaline Rocks and Carbonatites of the World

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Agua Emendada


Occurrence number: 
Longitude: -51.12, Latitude: -17.03

This is a small eroded volcanic neck cutting Carboniferous sandstones and consisting principally of breccias and tuffs, but with some flows. The central part is composed of alnoite/monchiquite-type rocks containing phenocrysts of olivine, Ti-augite, pleonaste, perovskite and opaques in a groundmass of pyroxene, melilite and opaques. The flows are variably vesicular and contain phenocrysts of olivine, Ti-augite and (?)feldspathoid, in a groundmass of pyroxene, biotite, opaques and glass; anorthoclase xenocrysts are found in some areas.

GLASER, I., BEZ, L., MARQUES, V.J. and RIPPEL, C. 1970. Excursao No. 3: Regiao de Ipora. Anais Congresso Brasileira de Geologia, 2: 39-58. 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
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