Orthogranulites from Mangaratiba, Rio de Janeiro, Brazil, a window for the Archean in the Ribeira belt: lithogeochemistry and isotopic geochemistry of Nd and Sr
DOI:
https://doi.org/10.11606/issn.2316-9095.v21-164453Keywords:
Orthogranulites, Mangaratiba (RJ), Lithogeochemistry, Isotopic geochemistry, Ribeirão das LajesAbstract
The present study has a goal to contribute to the understanding of the origin of the Archean granulites (ca. 2.65 Ga) of the region of Mangaratiba (RJ), that was recently denominated Orthogranulites Ribeirão das Lajes. The granulites are homogeneous, consisting mainly of quartz, K-feldspar and plagioclase (greenish), with biotite, clinopyroxene and orthopyroxene as the most common mafic minerals. The protoliths are granites and granodiorites compositions. The lithogeochemistry data indicate they are medium to high-K calc-alkaline with metaluminous compositions, corresponding to granites from the arc. The analysis of Rare Earth Elements (REE) reveals there are different cogenetic suits of rock between granulites. However, due to the number of analyses, it was not possible to more accurately define all possible suites. Sm/Nd and Rb/Sr analyses were also performed on the same orthogranulite dated in a recent work as an Archean (MAN-JEF-01a), and a TDM model age obtained has approximately 2.7 Ga was obtained. Its positive εNd(t) (+2.1) indicates a rock from the depleted mantle, despite the calculated 87Sr/86Sr(t) ratio (0.70529), indicates some crustal contribution (enriched source). The data obtained here suggest that the orthogranulites of Mangaratiba (RJ) may be products of magmatism in the Neoarchean, from a mantle source involving crustal assimilation.
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