@Article{MauryaMeFoPaLaMi:2018:DeReSt,
author = "Maurya, Ved P. and Meju, Maxwell A. and Fontes, Sergio L. and
Padilha, Ant{\^o}nio Lopes and La Terra, Emanuele F. and
Miquelutti, Leonardo G.",
affiliation = "{Observat{\'o}rio Nacional} and Petronas Upstream Exploration,
Kuala Lumpu and {Observat{\'o}rio Nacional} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Observat{\'o}rio
Nacional} and {Observat{\'o}rio Nacional}",
title = "Deep Resistivity Structure of Basalt-Covered Central Part of
Paran{\'a} Basin, Brazil, From Joint 3-D MT and GDS Data
Imaging",
journal = "Geochemistry, Geophysics, Geosystems",
year = "2018",
volume = "19",
number = "7",
pages = "1994--2013",
month = "July",
abstract = "The deep structure beneath the basalt-covered sediments of
Paran{\'a} basin is not well understood. Magnetotelluric (MT)
broadband (1,000 to 0.001 Hz) data recorded at 296 selected
stations along three new survey lines were first inverted in three
dimensions to reveal the local scale resistivity structure of the
central part of the basin where there are three deep exploration
wells with resistivity logs for model validation. The 3-D MT
inversion model correctly identified the resistive (>100
\Ωm) flood basalts and postvolcanic cover layer, the
underlying electrically conductive (~10 \Ωm) sediments, and
the highly resistive (>1,000 \Ωm) crystalline basement at
the well locations and provides a reliable average crustal
resistivity structure consisting of ~2024 km thick highly
resistive upper crust and ~20 km thick conductive lower crust
above a resistive mantle. Subsequent basin-scale joint inversion
of highest quality MT data sets (261 stations) and geomagnetic
depth sounding array data imaged two prominent subparallel belts
of N-S and NNE-SSW trending steep conductors in the deep crust and
upper mantle, one located directly beneath the present-day axis of
thickest sedimentary deposits in the basin and another near the
coastal location where dolerite dyke swarms intrude the
outcropping Precambrian basement. Other roughly orthogonal bands
(E-W to NW-SE) of linear crustal conductors radiate from these two
main belts. The resulting networks of steep conductors at upper to
midcrustal level seem to mark the fossil plumbing system of
Paran{\'a} magmatic province and are interpreted as preexisting
shear zones exploited by the voluminous Early Cretaceous magmatism
in the region.",
doi = "10.1029/2017GC007314",
url = "http://dx.doi.org/10.1029/2017GC007314",
issn = "1525-2027",
language = "en",
targetfile = "maurya_deep.pdf",
urlaccessdate = "22 maio 2024"
}