Reprocessing and interpretation of deep structures in a regional transect of the Parnaíba Basin, Brazil
Rafael R. Manenti, Wilker E. Souza, Milton J. Porsani, 2018. "Reprocessing and interpretation of deep structures in a regional transect of the Parnaíba Basin, 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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The Parnaíba cratonic basin is located in the NE of Brazil and its sedimentation started in the Silurian with the Serra Grande Group. Deep reflection seismic data were acquired along a 1400 km-long profile, with 20 s of two-way travel time (TWT) across the basin. Using these data, we were able to interpret and conjecture about the composition complexity level of the crust and mantle from the features presented in the lower crust, Moho reflector and upper mantle. In addition, the presence of basaltic intrusions from the Sardinha and Mosquito formations are mapped as outcrops and magnetic anomalies on the geological map, and by correlating these areas of occurrence with the lack of the Moho in the seismic section may suggest that these igneous bodies, in some way, contribute to the lack of signal seen in parts of the data.
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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.