Caracterização geológica e estrutural através da interpretação do produto integrado TM-Landsat 5 e dados aerogamaespectrométricos, região de Alta Floresta - MT

Abstract

This paper deals about the geological, tectonic and structural characterization in the Alta Floresta Gold Province region, MT, through the digital integration of TM-Landsat and gamma ray spectrometry data (total count). The total count-TM integrated product has the essential features for geological interpretation. This product shows structural features from the drainage pattern and relief elements (TM image) and shows the radiometric values (RGB) that contribute to the differentiate lithostructural units. The geological map was composed based on the total count radiometric values interpretation (considering the topography and anthropogenic interference on the radiometric response), in the relief and drainage patterns features (TM image) and field data. Considering the intense anthropogenic activities in the area and almost flat terrain (that prejudice the geological interpretation of remote sensing image), the integrated products generation (TM-gamma) was decisive to the obtention of indispensable data to the mapping. The final product was the geological map of area, in the 1:250.000 scale, with delimited 10 lithostructural units, directly related to radiometric units and structural features. In addition, remarkable N60-70W trend strike-slip systems (ductile and ductile brittle shear zones) were detected and characterized through visual interpretation of the integrated products and field verification.

Geoelectric Signature of Gold Mineralization in the Alta Floresta Gold Province, Mato Grosso State, Brazil

“…Some geophysical operations in the PAAF, such as the Juruena-Teles Pires Project 1991 [3,5], have developed new geological maps for the PAAF region based on airborne geophysical data. Some studies [20,21] have used remote sensing and aerogeophysics for better descriptions and location of minerals in the region, while others [22,23] have used remote sensing and airborne geophysical surveys to model geophysical data and describe the geological and metallogenetic implications of the region. The work conducted in [24] developed mineral-prospecting research using geochemical and geophysical methods, including magnetic, electromagnetic, resistivity, and induced polarization methods.…”

Integration of remote sensing and airborne geophysical data applied to geological mapping: a case study of the Vieirópolis region (Paraíba), Rio Grande do Norte Subprovince, Borborema Province

“…Over the last decades, remote sensing (optical and digital elevation models) and airborne geophysical data have been intensely used to understand the structural evolution of Brazilian provinces (e.g., Dantas et al, 2003;Maas et al, 2003;Madrucci et al, 2003;Carrino et al, 2007;Zacchi et al, 2010). Once they capture data using aerial or orbital sensors, these techniques can rapidly cover a vast area with spatial resolution demanded in mapping on regional or semi-detailed scales.…”

Fusão de imagens altimétricas e aeromagnetométricas como ferramenta de interpretação geológica, exemplo da Província Mineral de Carajás (PA)

“…No Brasil, os dados comumente utilizados em fusão de imagens são a gamaespectrometria e o sensoriamento remoto, tanto no espectroótico como no de microondas (Dias & Paradella, 1997;Paradella et al, 1997;Paradella et al, 2000;Santos et al, 1997;Teruiya, 2002;Madrucci et al, 2003).…”