Produção Nacional
Caracterização sísmica e gravimétrica da litosfera sob a linha de refração sísmica profunda de Porangatu, Província Tocantins, Brasil Central
2011; Sociedade Brasileira de Geologia; Volume: 41; Issue: 1 Linguagem: Inglês
10.25249/0375-7536.2011411130140
ISSN2177-4382
AutoresDhébora Batista Rosa Ventura, José Eduardo Pereira Soares, Reinhardt A. Fuck, Lucas da Costa Coutrim Caridade,
Tópico(s)High-pressure geophysics and materials
ResumoRecent results from receiver function in Novo Planalto region intensified the debate about the lithospheric structure through the limit of Tocantins Province and Amazon plate, in central Brazil. Aiming to better characterize this transition and to discuss the geological nature of the lower crust beneath Porangatu line, this work inferred the thickness of the crust beneath shot 2 of Porangatu line, using receiver function, refined the model of the crust, determined the density distribution by gravimetric modeling and integrated the results. Integrated analysis of seismic and gravimetric data highlighted the existence of a distinct crustal domain west of Serra Azul, evidenced by the abrupt thickening of the crust and the high density of these terranes. Vp and density values also showed that the lower crust beneath Porangatu line is mafic. Geophysical results show that the boundary between Tocantins Province and Amazonian Plate is marked by Serra Azul and that this limit is characterized by crustal interfigering and superposition of lower crusts. Differences between Neoproterozoic and older lithospheric mantle related to Amazonian and São Francisco plate are well defined.
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