Mapeamento geológico do contato entre do Grupo Martinópole e Complexo Granja, Domínio Médio Coreaú, Província Borborema

Abstract

This work deals with the geological mapping at a scale of 1:25,000, covers an area of 50 km2 located in the municipality of Ifruoca (Folha SA-24-Y-CIII) is located in the Middle Domain Coreaú were identified units of Paleoproterozoic the Neoproterozoic. These units were defined at the base to the summit as: Granja Complex (basement) is composed ortoderivados gneiss, hombiende gneiss, mylonitic gneiss and migmatite gneiss. The gneisses exhibit a gray to dark gray mediam to coasse grained and migmatitic structures and milonitizados. The Group Martinópole consists of quartzite pure, brecciated quartzite. Metamorphism in this unit reaches high temperatures (sillimanite) and interrnediate pressure. The gneisses have a history as the metasediments monocyclic polycyclic Brasiliano Cycle (600 Ma). The Granja Complex is presented against the native package aloctóne Martinópole Group are limited by tectonic discontinuities ranging from ramps or thrust nappes evolving to transcurrent, which forni the typical Brasiliano lineament.