Analise da deformação regional e mineral do complexo Pedra Branca (CE) e de seus depositos cromiferos

TL;DRAbstract

This work is an analysis of the deformation and metallogenetic aspects of an area in the central portion of Ceara State. The area is located in the Pedra Branca Complex and it consists of TTG-type sequences containing several metamafic and metaultramafic bodies, some of which contain chromitite with PGE. The microstructural studies have shown that the deformation of granitic composition rocks observed in minerals such as, quartz, micas and feldspars, do not have any record of preterit deformation. On the other hand, mainly because of their reological properties, metamafic rocks show evidence of prior deformation, as was seen in hornblendes and plagioclases. Based on thP. field work and optical microscopic observations, three deformational events have been established: the first (D ), is characterized by gneissic banding and mineral 1 lineation (N90), probably of Archean age. The second (D ), and 2 more important, is characterized by a tangencial tectonics that produced a low-angle foli

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