Evolução da zona de fratura romanche na margem equatorial do Brasil
Large-offset transform faults/fracture zones characterize transform continental margins, which have been seldom investigated when compared to divergent and convergent margins. These faults influenced the segmentation and evolution of the transform margins. This study investigates the evolution of...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/24030 |
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| Resumo: | Large-offset transform faults/fracture zones characterize transform continental margins,
which have been seldom investigated when compared to divergent and convergent
margins. These faults influenced the segmentation and evolution of the transform
margins. This study investigates the evolution of the Romanche Fracture Zone (RFZ) in
the Equatorial margin of Brazil using bathymetric, magnetic, gravity, and reflection
seismic data. The results of the present investigation indicate that the RFZ is an E-Wtrending,
~70-km-wide zone marked by ridges 2.5 km above the surrounding
topography. Magnetic anomalies that mark the oldest oceanic crust are at an angle of
26° and 30° clockwise south and north of the fracture zone, respectively, indicate that
the first spreading centers were oblique to the main fracture zone. The anomalies
rotated clockwise and shift from oblique to orthogonal to the transform at isochron 34
(83.5 ± 8 My). This rotation indicates that the influence of the continental-oceanic crust
boundary is less pronounced as the anomalies become younger and a farther away
from the continent. The RFZ behaved as topographic barrier, which prevented part of
the sediments from the continent and shelf from reaching the northern part of the ridge.
Normal faults form the border of the continental shelf and the borders of ridges and
seamounts and they reach the upper younger layers, indicating that neotectonic
reactivation. The orientation and geometry of the RFZ shaped the present-day geometry
of the Brazilian margin, characterized by E-W- and NW-SE-trending sectors, and the
evolution of the Pará-Maranhão, Ceará, and mainly the Barreirinhas basin. |
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