
handle: 10773/13095
O Complexo de Granja, localizado no Domínio Médio Coreaú (NW Ceará, Brasil), corresponde a um cinturão metamórfico de médio a alto grau, composto por três unidades principais: (1) ortognaisses migmatizados de afinidade TTG; (2) paragnaisses com granada, silimanite e distena migmatizados e (3) granulitos ortoderivados. De acordo com o conteúdo em minerais máficos, os granulitos ortoderivados podem ser subdivididos em dois grandes grupos: granulitos máficos (> 30% de minerais máficos) e enderbitos / charnoenderbitos (< 30% de minerais máficos). Apresentam texturas variando de isotrópicas a gnáissicas e distinguem-se entre si por variações nas proporções modais da mesma associação mineralógica (ortopiroxena + clinopiroxena + plagioclase + granada + biotite + quartzo ± anfíbola ± apatite ± zircão + opacos), o que poderá estar relacionado com diferenças na composição dos protólitos ígneos que lhes deram origem.
The Granja Complex, located in the Médio Coreaú Domain (NW Ceará, Brazil) corresponds to a medium to high grade metamorphic belt consisting of three main units: (1) tonalite-throndhjemite-granodiorite orthogneisses – TTG, showing evidence of migmatization; (2) migmatized paragneisses with garnet, sillimanite and kyanite and (3) igneous derived granulites. According to their contents in mafic minerals, the metaigneous granulites can be subdivided into two main groups: mafic granulites (> 30% mafic minerals) and enderbites / charnoenderbites (< 30% mafic minerals). Both types show textures ranging from isotropic to gneissic and can be distinguished by variations in the modal proportions of the same mineral assemblage (orthopyroxene + clinopyroxene + plagioclase + garnet + biotite + quartz ± amphibole ± apatite ± zircon + opaque minerals), reflecting differences in the composition of their igneous protoliths.
Petrografia, Domínio do Médio Coreaú, Complexo de Granja, Granulitos
Petrografia, Domínio do Médio Coreaú, Complexo de Granja, Granulitos
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