Produção Nacional
GEOLOGIA, ESTRATIGRAFIA E DEPÓSITOS MINERAIS DO PROJETO VILA NOVA, ESCUDO DAS GUIANAS, AMAPÁ, BRASIL
1999; Sociedade Brasileira de Geologia; Volume: 29; Issue: 2 Linguagem: Inglês
10.25249/0375-7536.199929173178
ISSN2177-4382
AutoresCarlos Alberto Spier, César Fonseca Ferreira Filho,
Tópico(s)Geological and Geochemical Analysis
ResumoThe Vila Nova Project covers an área of 170 km 2 located at the center-southeast of the Amapa State, Brazil. The Project area comprises granite-gneiss terrains, mafic-ultramafic rocks, volcanic-sedimentary association and intrusive granitic and basic intrusive. Upper amphibolite facies metamorphism affected the mafic-ultramafïc rocks as well as the volcanic-sedimentary association. Several ore bodies of chromium, gold and iron together with occurrences of diamond and tantalite indicate the anomalous concentration of mineral deposits in the region. The maficultramafïc rocks, named Mafic-Ultramafic Bacuri Complex, are intrusive in the granite-gneiss terrains and older than the volcanicsedimentary association. The Bacuri Complex hosts 11 stratiform deposits with proven chromitite reserves of 9 Mt, indicating an extensive mantelic magmatism. The volcanic-sedimentary association is correlated to the Vila Nova Group and consists of fine- and coarse-grained clastic metasediments and chemical metasediments with basic metavolcanics interlayered. This association hosts deposits of gold and iron and corresponds to a Paleoproterozoic greenstone belt broadly comparable to the Guyana Shield greenstone belts.
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