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INTEGRAÇÃO DE DADOS DE RADAR, AEROGAMAESPECTROMÉTRICOS E GEOLÓGICOS NOS DOMÍNIOS DO COMPLEXO GRANÍTICO ESTRELA, PROVÍNCIA MINERAL DE CARAJÁS

2006; Sociedade Brasileira de Geologia; Volume: 36; Issue: 2 Linguagem: Inglês

10.5327/rbg.v36i2.1232

2317-4889

Edson Ricardo Soares Pereira da Cunha, Athos Ribeiro dos Santos, Waldir Renato Paradellá, Carlos Eduardo de Mesquita Barros, P. Veneziani, Armínio Gouveia Do Vale,

Geological and Geochemical Analysis

The Complex is located on the southeastern border of the Amazonian Craton, and is considered a representative of the Archean syntectonic granitization event within the Carajas Mineral Province. The integration of airborne C-HH SAR (SAREX) with airborne gamma ray (Total Count) and geology (map of internal facies) has provided a powerful tool for terrain visualization, for re-evaluation of previous data and also confirmed information regarding the spatial distribution of internal petrographic facies. In the integrated product, SAR imagery has contributed with valuable textural information related to geological structures and erosion expression of lithologies, while airborne gamma-ray (Total Count) was useful in the discrimination of rock units, closely related to hue variation, allowing the discrimination of distinct domains (granite complex and host rocks, internal magmatic facies). The areas with stronger gammaespectrometric responses are spatially related to biotite monzogranites, which have higher concentrations of potassium, uranium, thorium, rubidium and rare-earth elements. Diabase dikes and brittle structures were also easily identified on the integrated product. Furthermore, structural patterns were revealed for the whole granite complex and host rocks, showing the importance of synoptic view for mapping purposes. The application of this approach in geological and exploration programs in similar areas of the Amazon is important due to the general absence of geological information with spatial attributes and the reduction of expenses for field campaigns.