Electrical conductivity structure across the Parnaíba Basin, NE Brazil
Version 2 2018-07-09, 09:43
Version 1 2018-07-09, 09:42
Posted on 2018-07-09 - 09:43
Magnetotelluric (MT) data spanning from 0.001 to 50 000 s were acquired across the Parnaíba cratonic
basin along an east–west profile approximately 1430 km long. Our preferred 3D resistivity inversion
model revealed the presence of three distinct lithospheric blocks bounded by major electrical discontinuities.
The western block is characterized by mainly resistive crust and upper mantle, comprising the Amazonian Craton
and the western border of the Parnaíba Basin. The central block reveals a broad highly conductive anomaly
extending to the upper mantle and is entirely within the basin limits. The eastern block extends from the eastern
portion of the Parnaíba Basin towards the Borborema Province, and discloses two resistive profound vertical
anomalies cutting through the crust and upper mantle, intercalated by a conductive zone. We associate this
large conductive zone (>100 km long) with the signature of the Transbrazilian Lineament Shear Zone which
appears to have served as palaeofluid pathways. The anomalous bulk conductivity increase in the crust beneath
the central part of the Parnaíba Basin is credited to the impregnation of the lithosphere by conducting minerals
related to tectonic events involving either Brazilian orogenic processes or dispersed magmatic residues associated
with the continuous igneous intrusions that occurred during the Triassic and Cretaceous.
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Solon, F.F.; Fontes, S.L.; La Terra, E.F. (2018). Electrical conductivity structure across the Parnaíba Basin, NE Brazil. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4157600.v2
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AUTHORS (3)
FS
F.F. Solon
SF
S.L. Fontes
EL
E.F. La Terra
CATEGORIES
KEYWORDS
Brazilian orogenic processestectonic eventsmantleBorborema ProvinceTransbrazilian Lineament Shear Zoneconductive anomalyconductive zone3 D resistivity inversion modelcrust50 000magmatic residuesMTbulk conductivity increasebasin limitsParna íba cratonic basin1430 kmpalaeofluid pathwayslithospheric blocksNE Brazil MagnetotelluricElectrical conductivity structureParna íba BasinAmazonian CratonGeology