Levantamento Geoquímico Orientativo para Fosfato na Região de Itataia, Estado do Ceará, Brasil

Bruno de Oliveira Calado, Claudio Gerheim Porto, Maisa Bastos Abram

Abstract


A geochemical survey was conducted in the vicinity of the Itataia uraniumphosphorus deposit in the Ceara state, northeastern Brazil, as part of the Phosphate Project implemented by the Geological Survey of Brazil. Data from the geochemical survey of stream sediments from the Quixadá sheet, scale 1:250,000, were processed and interpreted to evaluate in more detail the geochemical response issued by the deposit. Geochemistry of ore, sediment and soil on the scale of detail in the vicinity of the deposit are reported to study the mobility of metals and their ore-related dispersion. The geochemistry of sediment samples of low density were analyzed by QQ Plot graphs indicate anomalous points of P and U in the vicinity of the deposit. The geochemical associations showed that P is associated with the Yb, Th, Lu, Y, Ce, La, Mn and U, and is well delineated surrounding the deposit. The transect soil along the slope that hosts the deposit shows a predominantly clastic dispersion up to 850 meters, and highlighting in fractions Total and <20 meshes. The soil on the ore presents enrichment in U, P, Yb, Tb, Lu, La, Ce and Cd compared to soil in regional rocks. The paleo-alluvial sediments in the fraction <150 meshes exhibit high levels of As, Be, Bi, Co, Cr, Cu, Fe, Al, Ga, Li, Ni, Sn, V and Zn, compared to stream sediments. These elements are enriched in the ore, which reinforces the applicability of paleo-alluvials as sample medium in geochemical exploration.



DOI: http://dx.doi.org/10.21715/GB2358-2812.2016301033

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