Nascimento, Marcos Antônio Leite doGuerra, Derick Giordano Feitosa2021-05-042021-05-042020-12-15GUERRA, Derick Giordano Feitosa. Petrografia, química mineral e litoquímica do augen gnaisse Riacho Salgado (Lajes/RN), extremo nordeste da Província Borborema. 2020. 117f. Dissertação (Mestrado em Geodinâmica e Geofísica) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2020.https://repositorio.ufrn.br/handle/123456789/32377The paleoproterozoic magmatism in Borborema Province have been studying for better understanding the most importante Earth’s crust formation period, this period of great rock volume in state. In this connection, this article show petrographic, mineral chemistry and litochemistry data of Riacho Salgado augen gneiss (AGRS) located near of Laje’s urban center, of paleoproterozoic age (rhyacian).In addition, state of art was conducted on the augen-type texture and the lithology in question of Rio PiranhasSeridó Domain (DPS). Three metamorphic events are described in literature, while the present work only two have been described, called M2 and M3, and consequently the definition of differents minerals generation, such as k-feldspar and plagioclase with three generation. Quartz, biotite, amphibole, titanite and opaque minerals show two gerations. Allanite, zircon and apatite are protolith crystals. Epidote, clorite, muscovite and carbonate occur as alteration. The opaque minerals are classified as magnetite, pyrite and ilmenite. From qualitative analyses of petrography,a high grade metamorphic is inferred, in transition from superior amphibole to granulite facies. In SEM, zircon and titanite where indicated of continental crust granites, whereas biotite, rich in annite’s molecule has indicate calcialkaline granites. In SEM zircon and titanite where indicated of continental crust granites, whereas biotite, rich in annite’s molecule has indicate calcialkaline granites. Opaque minerals are classified as magnetite, pyrite and ilmenite. Amphibole are classified as pargasite and magnesian-hornblend of subalkaline and alkaline magmas. The plagioclase are andesine. In lithochemistry, the AGRS shows igneous provenience, classified as metaluminous, high-K calcalkaline or subalcaline with positive anomalies of Eu. For geotectonic classification suggest for AGRS a continental arc syn subduction, with high Sr-Ba contents and oxidant character. For lithochemical data collected from literature the geochemical classification and geotectonic environment are similar, fortifying theory of same genesis for augen gneiss observed in DPS, immersed in metaplutonic unity of Caicó Complex.Acesso AbertoPetrografiaQuímica mineralLitoquímicaEstado da arteAugen gnaissemasterThesis