Cenozoic tectonics of Amazon Mouth Basin |
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Authors: | S R P Silva R R Maciel and M C G Severino |
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Institution: | (1) Petrobrás, Av. República do Chile, 65/1301E. Centro, Rio de Janeiro, Brasil, CEP 20035-900, CL |
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Abstract: | The Cenozoic shelf margin of the Amazon Mouth Basin is characterized by a thick prograding prism of siliciclastic sediments.
This prism, composed mainly of Upper Miocene and younger sediments, overlies a Lower Tertiary carbonate shelf. Two tectonic–sedimentary
models for the area were developed with the aid of new deep-reflection seismic data. Gravitational tectonics dominate the
regional geological framework. Tensional stresses are created near the shelf margin, and compressional features dominate at
the base of the slope. The morphology of this compressional zone is closely associated with the St. Paul Fracture Zone and
the boundary between continental and oceanic crusts.
Received: 20 August 1996 / Revision received: 11 June 1998 |
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