@InProceedings{PadilhaVitPádBatFuc:2017:3DMoMa,
               author = "Padilha, Ant{\^o}nio Lopes and Vitorello, {\'{\I}}caro and 
                         P{\'a}dua, Marcelo Banik de and Batista, Joelson C. and Fuck, 
                         Reinhardt A.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade Federal da Bahia 
                         (UFBA)} and {Universidade de Bras{\'{\i}}lia (UnB)}",
                title = "3D modeling of magnetotelluric data unraveling the tectonic 
                         setting and sources of magmatism in the northeastern corner of 
                         Borborema Province, NE Brazil",
            booktitle = "Proceedings...",
                 year = "2017",
         organization = "AGU Fall Meeting",
             abstract = "The Borborema Province in northeast Brazil is a complex orogenic 
                         system formed by crustal blocks of different ages, origin and 
                         evolution amalgamated during the West Gondwana convergence in late 
                         Neoproterozoicearly Phanerozoic Brasiliano Orogeny. We discuss 
                         here new magnetotelluric (MT) data collected along four linear 
                         profiles crisscrossing the northeastern corner of the province to 
                         assess its deep electrical resistivity structure. Dimensionality 
                         analysis showed that a 3D electrical structure predominates in the 
                         subsurface and thus the data were modeled by a 3D MT data 
                         inversion scheme. The modeling revealed several subvertical 
                         discontinuities, with significant lateral contrast in the overall 
                         geoelectric structure, down to upper mantle depths. A major 
                         conductivity anomaly is registered in the crust beneath 
                         Neoproterozoic supracrustal rocks (Serido Group) and this anomaly 
                         deepens to upper mantle depths in the northwest direction below a 
                         zone of Paleoproterozoic plutons (Caico Complex). It has been 
                         suggested that the Serido Group was originally initiated as a 
                         sedimentary basin developed upon a Paleoproterozoic basement 
                         during a Neoproterozoic extension event related to a collisional 
                         foredeep of a south-dipping subduction slab, contrary to our 
                         northwest-dipping conductivity vergence. In case of the Caico 
                         Complex, because of the petrogenesis of its orthogneisses that 
                         indicates partial melting of a metasomatically enriched spinel-to 
                         garnet-bearing lherzolite with adakitic features, we also propose 
                         a subduction zone environment for its original magmatism. 
                         Considering the tenuous evidence indicating that this conductive 
                         anomaly could extend down into the upper mantle in the same region 
                         where teleseismic tomography register an attenuation of P waves, 
                         it can be concluded that this zone could also be the source of the 
                         metasomatic fluids and minerals observed along north-south 
                         Mesozoic volcanic plugs and flows of alkaline rocks and alkali 
                         basalts (MacauQueimadas belt). In contrast to the general pattern 
                         in several parts of the province exhibiting a multitude of 
                         resistive and conductive zones marking the crust and upper mantle, 
                         an elongated resistive cratonic-like keel in the WSW-ENE direction 
                         is observed along the southeastern side of the study area.",
  conference-location = "New Orleans",
      conference-year = "11-15 Dec.",
             language = "en",
           targetfile = "padilha_3d.pdf",
        urlaccessdate = "28 abr. 2024"
}