"Título: 3-D inversion of magnet"otelluric data: example from a complex dataset in northeastern São Francisco Craton, Brazil"
Palestrante
Prof. Dr. Mauricio de Souza Bologna
Depto. de Geofísica IAG/USP
Dia: 17 de agosto (quinta-feira)
Horário: 16h30
Local: Auditório 1 (IAG/USP)
Resumo:
3-D inversion of magnetotelluric (MT) data still demands high computational cost, so researchers tend to prefer collecting MT data along profiles for subsequent 2-D modeling. This work presents a MT study in the northeastern part of the São Francisco Craton using a dataset obtained from MT sites along several intersecting profiles, making the data distribution over the area highly uneven and therefore non-ideal for 3-D modeling. Results from 3-D inversion are evaluated for robustness and potentiality for yielding tectonic information. The most striking features in the model are several strong (~1 Ωm) crustal conductors beneath the central part of the Archean Serrinha Block, which we attribute to a Paleoproterozoic oceanic plate subduction and arc-continent collision event involving the Rio Itapicuru Greenstone Belt and the basement of the Archean Serrinha Block.
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Eliza Ribeiro Soares Departamento de Geofísica IAG-USP Tel: (11) 3091-4763 Fax: (11) 3091-5034 email: eliza@iag.usp.br