Geochemical and temporal provinciality of the magmatism of the eastern Parnaíba Basin, NE Brazil
Published:January 01, 2018
Monica Heilbron, Eliane Guedes, Miguel Mane, Claudio de Morisson Valeriano, Miguel Tupinambá, Júlio Almeida, Luiz Guilherme do Eirado Silva, Beatriz Paschoal Duarte, Jorge Carlos Dela Favera, Adriano Viana, 2018. "Geochemical and temporal provinciality of the magmatism of the eastern Parnaíba Basin, NE Brazil", Cratonic Basin Formation: A Case Study of the Parnaíba Basin of Brazil, M. C. Daly, R. A. Fuck, J. Julià, D.I.M. MacDonald, A. B. Watts
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This paper presents new field, petrographic, geophysical, geochemical and geochronological data for the felsic and mafic magmatism of the eastern Parnaíba Basin, integrating previously published data with new surface data acquired within the scope of the Cooperation Program developed by UERJ-Petrobras. New precise 40Ar–39Ar Cambrian ages (c. 508–506 Ma) were obtained for the felsic volcanic to subvolcanic rocks associated with intracontinental rift sediments in the São Raimundo Nonato area in the SE of the basin. The new results include the detection of three different basic magmatic pulses at c. 181, 126 and 118...
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Cratonic Basin Formation: A Case Study of the Parnaíba Basin of Brazil
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Cratonic basins are large, distinctive features of the continental crust. They are preferentially developed on thick continental lithosphere, are typically sub-circular in shape and subside over periods of hundreds of millions of years. They are also endowed with significant resources. However, in spite of their location in continental interiors and often well-known geology, the subsidence driving mechanism and tectonic setting of these basins remains controversial.
This volume presents both lithospheric and basin scale datasets acquired specifically to interrogate the tectonic process of cratonic basin formation. Focused on the Silurian to Triassic Parnaíba cratonic basin of Brazil, the papers discuss the results of a multidisciplinary basin analysis project comprising new geophysical, geological and geochemical data. This unique dataset enables the characterization of the lithospheric crust and mantle beneath the Parnaíba Basin, constrains the detailed evolution of the basin itself, and enables comparisons with cratonic basins globally. Several convergent themes emerge providing new and powerful constraints for models of the driving mechanisms of these enigmatic basins.