Mapeamento geológico de uma área a noroeste da cidade de Solonópole

Abstract

The research area is located in Ceará Central Domain, Borborema Province. The mapping was done on the scale of 1:25:00 in an area covering about 36Km2 northwest of the Solonopóle City, State of Ceará. The region is composed of lithotypes that are positioned from the Paleoproterozoic ( migmatitic basement , metatexito and diatexito ), Neoproterozoic (tonante , granite type S ), Phanerozoic represented by pegmatites hosted during the Paleozoic, and fmally, by colluvial - anuviai covers the Cenozoic. The deformational structures observed result in regional foliation (Sn), striking in migmatitic complex researched (Acopiara Complex) with preferred direction N-S and dips from 20° to 82° west. A previous banding (Sr, _ 1) may be associated with migmatization. For the purpose of folding Sn _1 can be identified folds with vertical and horizontal shafts axial surface. In other situations where the deformation is more pronounced, particularly near of the shear zones , the folds are closed with isoclines indicators of the direction of movement and in these cases it has bending axis in a vertical attitude. Petrographically, lithotipes forming part of migmatitic basement match metatexites, diatexites and not deformed rocks classified as tonantes and monzogranites the two mica. From the analysis of metamorphic mineral assemblages and petrography can be said that this area metamorphism took place under conditions of high amphibolite facies where also anatexis process was involved.