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Lithospheric structure of central Brazil revealed by combined 3-D electromagnetic and seismic tomography: relationship to intraplate magmatism and seismicity.

Maurya VP, Meju MA, Chaves CAM, Fontes SL, Padilha AL, Benevides AS, Rodrigues LN, La Terra EF.

GEOPHYSICAL JOURNAL INTERNATIONAL

https://doi.org/10.1093/gji/ggag280 

Lithospheric structure of central Brazil has been investigated using 3D electrical resistivity and P-wave tomography to elucidate the relationships among lithospheric deformation, Mesozoic-Cenozoic magmatism, and present-day intraplate seismicity. The results reveal a fragmented lithosphere dissected by steep NE-SW and NW-SE shear zones. Lithospheric inheritance and fluid migration have strongly influenced magmatism, deformation, and ongoing seismic activity

Fig: Multiphysics 3D Lithospheric model of central Brazil, where subduction roll-back and/or episodic mantle upwelling at lithospheric arches explain the known younging direction of alkaline magmatism.

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