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Alteration and alterability of the anorthosite from Angola
Simão, J.; Silva, Z. C. G.Siliceous rocks are widely used as dimension stone but the last decades have registered an increase rate of their alteration when exposed to polluted environments. Anorthosites were treated by acidified solutions of HCl, HN03 and H2S04 simulating acid rain and the response was recorded through different experiments such as on the surface of the polished rock and on the surface of uncovered thin sections. The ma...
Ditribuição de terras raras e outros elementos incompatíveis no Maciço de Monch...
Simão, J.; Bravo, M. S.; Ribeiro, M. L.When approaching a geochemical project a few problems of methodology have to be considered, among them the exploration grid that as to obey to representativity/rentability criteria. This preliminary study permitted to save near 27% on the sampling comparing with the net initially envisaged. Some criteria considered in the elaboration of the grade variation maps and the distribution of two elements in the area a...
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