Aplicação de sensores remotos e dados aerogeofísicos na cartografia geológica da região de Madalena, Domínio Ceará Central da Província Borborema

Abstract

Remote sensing and airborne geophysical data illustrate their usefulness to enhancement amphibolitic bodies in the Madalena Region, Central Ceará Domain of Borborema Province. Furthermore, a geological field survey was carried out to confirm the results obtained based on digital processing. This region aggregates two litho-stratigraphic units – an amphibolite-paragneiss association with minor gondite horizons and tonalite gneisses as an intrusive body. The tectonic architeture of this region is characterized by two generations of folds, a penetrative gneissic banding and stretching lineations with moderate rake. Landsat TM 7 ETM+ images show tectonic lineaments which related to regional foliation and kilometric folds, and its colour scale variations to primary compositions of the paragneisses. High total count values are concentrated on muscovite-bearing gneisses, where as low values on hornblende bearing gneisses and minimum peaks on amphibolite rocks. In the magnetic map, anomalous values are associated to amphibolite rocks and magnetic lineaments to regional structures.