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The detrital origin of the Moncorvo ordovician ironstones

d'Orey, F. L. C.

The Moncorvo Ordovician ironstones in northeastern Portugal consist of iron ore sedimentary horizons frequently interbanded with psamites and quartzites. Ore reserves may probably exceed 1 000 million tonnes and this makes Moncorvo the largest iron ore deposit in the European Union. Compact poorly banded massive layers may exceed 90 meters in thickness which is quite an extraordinary feature for a Phanerozoic d...

Data: 2010   |   Origem: Repositório Institucional da UNL

Chromian spinels in the basalts from the Lisbon volcanic complex (portugal) and...

d'Orey, F. L. C.; Palacios, T.

Chromian spinels are common in the late Cretaceous alkali basalts of the Lisbon volcanic Complex in Portugal. They occur as unzoned inclusions in magnesian olivines of all basalt types and as large spectacularly zoned grains in the groundmass of porphyritic basalts. Microprobe analysis indicate complex cationic exchange in the groundmass zoned spinels due to simple peritectic reactions and in response to changi...

Data: 2010   |   Origem: Repositório Institucional da UNL

Origem, transporte e deposição do ouro em Manica (Moçambique)

d'Orey, F. L. C.

The different types of Archean gold deposits in the Manica greenstone belt of western Mozambique are briefely describcd in the context of their geological setting. Particular attention is devoted to the mineralogy, petrology, geological controls, refractoriness to treatment and prospection of these gold deposits. The genesis of gold was stratigraphically controled, but structural and metamorphic events related ...

Data: 1992   |   Origem: Repositório Institucional da UNL

Zonal distribution of gold and platinium group elements in the Mondunguara depo...

d'Orey, F. L. C.

The Mondunguara copper mines are situated in mountainous terrain in west-central Mozambique. The mineralization consists of chalcopyrite, pyrrhotite, common pcntlandite, cobaltpentlandite, pyrite and several minor oxides and sulphides in tabular ore bodies deeping steep to the north. Gold was known to occur in small quantities but no systematic sampling and analysis for precious clements was ever done. Mineralo...

Data: 1992   |   Origem: Repositório Institucional da UNL

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Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia