Petrography, mineral chemistry, and lithochemistry of Riacho Salgado augen gneiss (Lajes/RN), Northest of Borboreme Province
DOI:
https://doi.org/10.11606/issn.2316-9095.v22-189990Keywords:
igneous protolith, paleoproterozoic, caicó complex, metamorphismAbstract
Paleoproterozoic magmatism in the Borborema Province has been studied for a better understanding of the most important period in the formation of the Earth’s crust. In this context, this work presents petrographic, mineral chemistry, and lithochemistry data for the Ryacian Riacho Salgado augen gneiss (augen gnaisse Riacho Salgado – AGRS), located in the urban area of Lajes, Rio Grande do Norte. These rocks show two metamorphic events, M2 and M3, with the development of different generations of minerals such as quartz, K-feldspar and plagioclase (three generations), as well as biotite, amphibole, titanite, and opaque minerals (two generations). Allanite, zircon, and apatite are considered protolith crystals. Epidote, chlorite, muscovite, and carbonates occur as a result of hydrothermal alteration. Opaque minerals are classified as magnetite, pyrite, and ilmenite. The chemistry of zircon and titanite (SEM-EDS) is indicative of a crustal granitic protolith, whereas biotite, enriched in the annite molecule, is compatible with a calc-alkaline signature. Amphiboles are classified as pargasite and magnesium-hornblende, of subalkaline to alkaline nature, while plagioclase corresponds to andesine. In lithochemistry, AGRS corroborates the igneous protolith and presents high-K (subalkaline) metaluminous and calcalkaline signatures, with positive Eu anomalies. In geotectonic terms, geochemistry suggests a syn-subduction continental arc environment, with high Sr and Ba contents. Therefore, the data compiled and presented in this study corroborate the most recent classification for the AGRS, immersed in the metaplutonic unit of the Caicó Complex.
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