Petrographic and litogeochemical characterization of Vale do Jacurici marbles and calc-silicate rocks, Bahia: paleoenvironmental conditions and phosphogenetic processes
DOI:
https://doi.org/10.11606/issn.2316-9095.v21-161794Keywords:
Jacuricy Valley, marbles, Calc-silicate rocks, Paleoenviromental conditions, PhosphogenesisAbstract
Based on paleoenvironmental interpretations with geochemical data, Vale do Jacurici marbles and calcissilicatic rocks, North-central of Bahia State, demonstrated an association with a paleoproterozoic shallow marine paleoenvironment. These rocks are deformed, metassomatized, and metamorphosed under high amphibolite to granulite conditions. They are intruded by the Itiúba Sienite and Mafic-ultramafic Complex Vale do Jacurici, mineralized in chromite, relation that indicates the minimum Paleoproterozoic age for the succession. In marble, marine signatures are preserved in RRE + Y patterns (PAAS normalized) with negative Ce-anomalies, positive Y and Gd-anomalies, and Y/Ho ratios near the values of sea water (60–168). Crustal contamination patterns indicate the presence of terrigenous components, especially in calc-silicate rocks, resulting in positive relations Zr versus Hf, relative enrichment of trace metals, ΣRRE + Y and Pr/Yb [SN], Y/Ho (< 30), and less marked anomalies. The presence of variable magnitudes of positive Eu-anomalies may reflect the contribution of signatures from residual Archaean seas and the influence of late magmatic fluids. The occourrence of anomalous values of P2O5 in marbles (1.38 and 4.56%) and diopsidites (2.07 and 2.3%) delimited with Y/Ho ratio (parameter of detritic contamination in the basin) that indicade signature of zones between terrestrial and marine contribution, evidences the stratigraphic control in phosphate concentration. These data indicate a paleoenvironment influenced by global climatic events that favors phosphogenesis, involving oxygen availability, similar scenario to Paleoproterozoic phosphate mineralized sedimentary basins in São Francisco Craton (SFC) and other parts of the world.
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Copyright (c) 2021 Mariana Andriotti Gama, Aroldo Misi, José Haroldo da Silva Sá, Luis Rodrigues dos Santos de Oliveira, Tatiana Silva Ribeiro
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