Mapping a Gondwana suture zone integrating magnetic methods and geology at the SE Brazilian continental margin

According to previous reconstructions, the South Atlantic Ocean is the biggest gap of
Gondwana, with important crustal limits that controls convergent and divergent tectonic
events since the Paleoproterozoic. In the SE Brazilian continental margin, a Cambrian NE-SW
suture zone is marked by an expressive magnetic anomaly onshore that extends offshore to
the proximal Santos basin (Rio de Janeiro). This suture separates two contrasting geological
terranes: a Neoproterozoic magmatic domain (Oriental Terrane), to the west, and a
Paleoproterozoic gneissic terrane, to the east (Cabo Frio Tectonic Domain). The focus is to
determine how this suture extends offshore, hence determining the nature of the basement
that constitutes the continental margin, and how it continues in depth, determining the
orientation of the Ediacaran paleo subduction zone. We made a geological and geophysical
integration aiming to characterize the magnetic pattern of terranes and structures in order to
determinate the geometry and dip direction of the suture in depth. The methodology included
the generation and interpretation of aeromagnetic images combined with geological mapping.
Also, two magnetic sections were made on field along the suture zone and modeled on GMSYS
adopting magnetic susceptibility values obtained both on field and laboratory. The studied
area comprises mainly two geological units separated by a thrust fault (suture zone): dioritic to
granitic Paleoproterozoic rocks with metabasite layers (Região dos Lagos Complex - RLC) and
Ediacaran aluminous paragneisses with calcsilicate layers (Palmital Succession). Based on the
amplitude (intensity), geometry, magnetic signal’s texture and lineament pattern, in map view,
two domains were defined: A1 and A2. The A1 is correlated with the Paleoproterozoic
gneisses, with high amplitude, long wavelength (55 km) with numerous magnetic rectilinear
and curvilinear lineaments. Amplitude ranges between -100 and 452 nT, mostly higher than
150 nT. A2 coincides with the Palmital paragneisses, defined by a low frequency, long
wavelength (55 km) magnetic domain, with amplitudes <0 nT, resulting in a lateral contrast of
more than 500 nT with A1, where the magnetic gradient decreases to NW. Magnetic
lineaments display a preferential NE-SW direction, but in A1 a deep NW-SE fabric occurs, that
might be related with the Paleoproterozoic tectonic fabric. The suture is represented by a high
positive curvilinear lineament, extending offshore, crossing the coastline to SW before
inflecting to the east. Modeling and geological/magnetic maps correlation suggest that the
suture dips to NW.