Geology and gravimetry of Ediacaran metaultramafic rocks and associated metacarbonatites of the Senador Eloi de Souza Complex, Borborema Province, NE Brazil
DOI:
https://doi.org/10.11606/issn.2316-9095.v21-178414Keywords:
Pyroxenites, Carbonatites, Geochemistry, Gravimetry, São José do Campestre MassifAbstract
With about 6,000 km2, the São José do Campestre Massif corresponds to one of the oldest remains of continental crust in South America, consisting of clinopyroxene gneisses, mafic-ultramafic complexes, and metasupracrustals with ages between 3.41 and 2.70 Ga. The Senador Eloi de Souza Complex corresponds to one of these units, being composed of clinopyroxene gneisses, garnet paragnaisses, and ultramafic bodies and associated carbonatites. U-Pb geochronological data in zircon suggest a crystallization age of 600 Ma for these carbonatites and pyroxenites. Contact features show magmatic breccias, where decimeter-sized fragments of pyroxenite are immersed in carbonatite with holocrystalline texture. The ultramafic rocks have a well-preserved igneous texture, a predominance of calcium pyroxene, a little fractionated pattern of rare earth elements, with LaN/YbN ratios of 1.5 – 8.6 and negative Eu anomaly (Eu/Eu* = 0.39 – 0.88). Carbonatites are rich in calcite, with phlogopite, olivine, and diopside as dominant mafic phases, low concentrations of rare earth elements, with low concentrations of rare earth elements, and LaN/YbN ratios of 8.9 – 49.0. 2D gravimetric modeling and field control allow to interpret ellipsoidal pyroxenitic bodies of shallow depth and carbonatites of less expressiveness in the center and edges of these ultramafic bodies. The integration of new geological, geochemical, and gravimetric data from this research is relevant to a better understanding of Ediacaran events in the Archean domain of the São José do Campestre Massif.
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Copyright (c) 2021 Marcella Samyla de Miranda Silva, Zorano Sérgio de Souza, Flávio Lemos de Santana, José Alexandre Paixão da Cunha
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