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Electromagnetic constraints for subduction zones beneath the northwest Borborema province: Evidence for Neoproterozoic island arc–continent collision in northeast Brazil

2013; Geological Society of America; Volume: 42; Issue: 1 Linguagem: Inglês

10.1130/g34747.1

1943-2682

Antônio L. Padilha, Ícaro Vitorello, Marcelo B. Pádua, Maurício de Souza Bologna,

earthquake and tectonic studies

Research Article| January 01, 2014 Electromagnetic constraints for subduction zones beneath the northwest Borborema province: Evidence for Neoproterozoic island arc–continent collision in northeast Brazil Antonio L. Padilha; Antonio L. Padilha 1Instituto Nacional de Pesquisas Espaciais—INPE, C.P. 515, 12201-970 São José dos Campos, Brazil Search for other works by this author on: GSW Google Scholar Ícaro Vitorello; Ícaro Vitorello 1Instituto Nacional de Pesquisas Espaciais—INPE, C.P. 515, 12201-970 São José dos Campos, Brazil Search for other works by this author on: GSW Google Scholar Marcelo B. Pádua; Marcelo B. Pádua 1Instituto Nacional de Pesquisas Espaciais—INPE, C.P. 515, 12201-970 São José dos Campos, Brazil Search for other works by this author on: GSW Google Scholar Maurício S. Bologna Maurício S. Bologna 2Departamento de Geofísica, Universidade de São Paulo—IAG-USP, Rua do Matão 1226, 05508-090 São Paulo, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Antonio L. Padilha 1Instituto Nacional de Pesquisas Espaciais—INPE, C.P. 515, 12201-970 São José dos Campos, Brazil Ícaro Vitorello 1Instituto Nacional de Pesquisas Espaciais—INPE, C.P. 515, 12201-970 São José dos Campos, Brazil Marcelo B. Pádua 1Instituto Nacional de Pesquisas Espaciais—INPE, C.P. 515, 12201-970 São José dos Campos, Brazil Maurício S. Bologna 2Departamento de Geofísica, Universidade de São Paulo—IAG-USP, Rua do Matão 1226, 05508-090 São Paulo, Brazil Publisher: Geological Society of America Received: 17 May 2013 Revision Received: 16 Oct 2013 Accepted: 17 Oct 2013 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2013 Geological Society of America Geology (2014) 42 (1): 91–94. https://doi.org/10.1130/G34747.1 Article history Received: 17 May 2013 Revision Received: 16 Oct 2013 Accepted: 17 Oct 2013 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Antonio L. Padilha, Ícaro Vitorello, Marcelo B. Pádua, Maurício S. Bologna; Electromagnetic constraints for subduction zones beneath the northwest Borborema province: Evidence for Neoproterozoic island arc–continent collision in northeast Brazil. Geology 2014;; 42 (1): 91–94. doi: https://doi.org/10.1130/G34747.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Borborema province in northeast Brazil occupies a crucial position in the complex Neoproterozoic West Gondwana reconstruction puzzle. However, correlation attempts between northeast Brazil and West Africa have been hampered because key links in the internal structure of the Borborema province have yet to be identified. To aid such an correlation, a magnetotelluric study was undertaken along two subparallel profiles to image the deep electrical structure in the northwestern part of the province. Despite the occurrence of recurrent tectonothermal episodes that affected the region in the past, two-dimensional models show that a large-scale signature of the assembled terrane during the Neoproterozoic accretion and collision is plausibly preserved in the area. Two resistive features dipping from the upper crust into the upper mantle in downward convergence (opposite directions) are defined beneath one of the profiles that are interpreted to be related to remnants of former subduction slabs, since the observed high-resistivity zone is consistent with a dehydrated oceanic lithosphere depleted of sediments. On the basis of geological and geochemical information, a model of collision of an intraoceanic magmatic arc coalesced into an earlier passive margin is proposed for the Neoproterozoic tectonic evolution of the province, involving processes of reversal of subduction polarity and oceanic slab breakoff. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.