Utilização de imagens aerogamaespectrométricas, Landsat7 ETM+ e aeromagnéticas no estudo do arcabouço crustal da porção central do domínio da zona transversal, Província Borborema, NE do Brasil

Abstract

In the central portion of the Transversal Zone (Borborema Province, northeastern Brazil), feld geological mapping combined with interpretation o airborne gammaspectrometric, magnetic and satellite imagery (Landsat 7 ETM+) data were performed in order to evaluate the importance (especially, continuation a depth) of shear zones as potential candidates to represent terrain boundaries and sutures. This integrated analysis emphasized three deeper structures which separat crustal blocks, including as such the Serra do Caboclo and the Congo-Cruzeiro do Nordeste shear zones. A deep anomaly, located between those two structures, ma represent the continuation, horizontally displaced, of one of them, or a third, non outcropping but interconnected shear zone. The favored interpretation considers thi sector of the Transversal Zone as formed by deep-rooted, northeast-southwest trending shear zones (with tops of anomalies reaching 6 to 16 km depths), cut by shallowe structures (tops of the anomalies reaching, at maximum, 2 to 6 km depth), with east-west trends. In this context, the importance and continuity at depth of the Serra d Caboclo shear zone is highlighted, and as such inferred to be the suture between Piancó-Alto Brígida and Alto Pajeú terranes, in accordance with feld geological data. © 2011 Sociedade Brasileira de Geofísica.