@Article{PadilhaVitoPáduBolo:2014:EvNeIs,
author = "Padilha, Antonio Lopes and Vitorello, {\'{\I}}caro and
P{\'a}dua, Marcelo Banik de and Bologna, Mauricio S.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and Univ Sao Paulo, IAG, Dept Geofis,
BR-05508090 Sao Paulo, Brazil.",
title = "Electromagnetic constraints for subduction zones beneath the
northwest Borborema province: Evidence for Neoproterozoic island
arc-continent collision in northeast Brazil",
journal = "GEOLOGY",
year = "2014",
volume = "42",
number = "1",
pages = "91--94",
month = "Jan.",
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.",
doi = "10.1130/G34747.1",
url = "http://dx.doi.org/10.1130/G34747.1",
issn = "0091-7613 and 1943-2682",
label = "isi 2014-05 PadilhaVitoPaduBolo:2014:EvNeIs",
language = "en",
targetfile = "padilha_etal_2014.pdf",
urlaccessdate = "29 mar. 2024"
}