Produção Científica



Artigo em Revista
09/08/2012

Evidences of buried loads in the base of the crust of Borborema Plateau (NE Brazil) from Bouguer admittance estimates
In the Borborema Province (BP) e northeastern Brazil e two important Cenozoic events occurred at the surface: the Macau magmatism and the Borborema Plateau epeirogenesis. To obtain appropriated-scale geophysical data to explain the deep origins of these two events, different gravimetric/elevation databases were integrated with new surveys. Bouguer admittance estimates reveal that isostatic condition of the BP, especially in the Borborema Plateau, can be explained using elastic models to the lithosphere only if surface and buried loadings are combined. If the buried load is applied in the base of the crust, the ratio between buried and surface weights is circa 15 for a lithosphere with effective elastic thickness around 15 km and crust thickness around 33 km. From an nterpretative viewpoint of the buried load, it is assumed that the lower crust under the Borborema Plateau might have an anomalous high value of
density. Magmatic underplating might explain this fact as well as the observed surface magmatism and epeirogenesis. Crustal thickening of about 4 km under the Borborema Plateau and intracrustal seismic
velocity discontinuity with high Vp/Vs ratio are geophysical facts consistent with magmatic underplating. However, the surface magmatism presents low volume and mainly alkaline composition e facts that are not entirely consistent with the hypothesis of magmatic underplating. Regardless the validity of this hypothesis, Cenozoic-to-present events in BP might be somewhat associated with imbalances in lithosphere-asthenospheric mantle and/or crust-lithospheric mantle systems. The existence of free-air anomalies showing no null integral over area and of an expressive positive geoid anomaly are geophysical evidences of these imbalances. Possibly, the Borborema Plateau is still suffering epeirogenesis.
Post-depositional deformation found in Barreiras Formation strata, Late Quaternay fault reactivations, and AFT thermochronology analysis suggesting the existence of a cooling stage between 20 and 0 Ma might be geologic evidences of the continued action of peirogenesis until the present. In addition, the relatively high level of the present intraplate seismicity recorded in several regions of the BP is another unequivocal geophysical evidence that the crust of the province is still submitted to accommodation processes.
Apresentação
23/03/2012

Anisotropic physical modeling
Jose Jadsom S. de Figueiredo, Robert Stewart, Joerg Schleicher, Nikolay Dyaur, Bode Omoboya, Robert Wiley and Anoop William. 1º Workshop do INCT-GP (2011)
Apresentação
23/03/2012

Estimação numérica do moveout para análise de velocidade de migração em super-gathers
Momoe Sakamori e Ricardo Biloti. 1º Workshop do INCT-GP (2011)
Apresentação
23/03/2012

Estimating quality factor from surface seismic data: a comparison of current approaches
Bonnie Ives de Castro Nunes, Walter Eugênio de Medeiros, Aderson Farias do Nascimento, José Antonio de Morais Moreira. 1º Workshop do INCT-GP (2011)
Apresentação
23/03/2012

Scattering-based decomposition of sensitivity kernels for full-waveform inversion
Daniel Leal Macedo, Ivan Vasconcelos e Joerg Schleicher. 1º Workshop do INCT-GP (2011)
Apresentação
23/03/2012

Estereotomografia para estimativa de macro-modelos de velocidades em imageamento sísmico: Aplicação em dados reais da Bacia do Jequitinhonha
Felipe Antonio Terra, Jessé Carvalho Costa e Amin Bassrei. 1º Workshop do INCT-GP (2011)
Apresentação
23/03/2012

Migração 3D em profundidade usando aproximação de Padé complexa
Carlos A. N. da Costa, Itamara do S. Campos, Jessé C. Costa, Francisco de A. S. Neto, Jörg Schleicher e Amélia Novais. 1º Workshop do INCT-GP (2011)
Apresentação
23/03/2012

Automatic Picking in the Semblance Domain
Lourenildo W. B. Leite and Wildney W. S. Vieira. 1º Workshop do INCT-GP (2011)
Apresentação
23/03/2012

A comparison of stabilized-least squares imaging conditions for wave-equation migration
Bruno D. Amaro, Joerg Schleicher, Amélia Novais e Jessé C. Costa. 1º Workshop do INCT-GP (2011)
Apresentação
23/03/2012

Aplicação do Método Eletromagnético Multifrequência na Exploração e Produção de Petróleo
Olivar Antonio Lima de Lima*, Carlos Alberto Dias**, e Hédison Kiuity Sato*. 1º Workshop do INCT-GP (2011)
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