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Use of Transition and Rare Earth Elements in the Evaluation of the Sedimentary Paleoenvironment of Devonian Shales, Brazil

Introduction: Source rocks contains measurable amounts of trace metals and rare earth elements (REEs). The trace metals present in these rocks were transferred from organic matter and sediments to porphyrin structures during the sedimentation process. The concentration of trace metals and REEs in the source rock will depend on the type and thermal maturity level of the organic matter and also on the conditions of its depositional paleoenvironment (Akinlua et al., 2016, Arning et al., 2009). Therefore, the main objective of this work was to evaluate the use of the transition elements Co, Ni, V, Mo and the rare earth elements of internal transition, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb, Lu and U (REEs) as indicators of the paleoenvironmental conditions of shales deposition of the Pimenteiras Formation (Devonian, Parnaíba Basin, Brazil).