Modelagem multidados dos corpos metamáficos-ultramáficos do greenstone belt Serra das Pipocas, Província Borborema, Ceará.

Abstract

The Serra das Pipocas Greenstone Belt, with rhyacian age (2.1 - 2.2Ga), is part of the Archean/Paleoproterozoic core of the Ceará Central Domain, and is located at the northern portion of Borborema Province, near the municipality of Independência and neighboring areas. Lithostructural mapping techniques associated with the analysis of airborne geophysical (Magnetometry and Gamma spectrometry), spectral (Landsat 8) and orbital Shuttle Radar Topography Mission (SRTM) data, allowed to identify different metamafic-ultramafic bodies in the greenstone belt, as well as its main regional structures. The integrated use of airborne geophysical data, ternary images (RGB and CMY), in the channels of K-Th-U (Gamma spectrometry) and 765 (Landsat 8) allowed a better delimitation of geological domains. The mafic index technique characterized with a better accuracy the mafic-ultramafic bodies within the sequence. The structural signatures were identified through the techniques of magnetometry (ASA and AGHT) and SRTM (shaded relief with 315° Azimuth and 45° attitude). Two structural trends were observed, one of them with strike NE-SW, associated to the Brasiliano main deformation phase, and the other one with strike NW-SE related to a late fragile deformation. The integration of these data has favored the development of a lithostructural framework map and the individualization of metamafic-ultramafic bodies of the Serra das Pipocas metavolcanic-sedimentary sequence.