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O problema da extracção do alumínio a partir dos sienitos nefelínicos
Coelho, A. V. PintoSome countries producers of the aluminium, attempt to use other ores which, in the future, will gradually substitute the bauxite as a raw material. Portugal possesses an nephelinic syenite massif which may be utilized for this purpose because the nepheline offers some advantages above other poor ores which are being essayed now. By laboratorial processes, the author puts forward those advantages and calls the a...
Exemplo de vulcanismo tardio em Portugal- rocha ígnea post-Miocénico inferior (...
Coelho, A. V. Pinto; Bravo, M. S.A small outcrop of an igneous rock (basanite) was observed in 1971 at Figueira-Mexilhoeira Grande-Algarve, enclosed by Miocene limestone and showing clear evidente of low grade thermal effects along the contact with the igneous mass. This is in agreement with F. L. Pereira Sousa who was the first geologist to admit (1917) the existence of Miocene igneous rocks in Algarve although subsequently they were not poss...
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