Oceanografia Ambiental

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Programa de Pós-Graduação em Oceanografia Ambiental

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Navegando Oceanografia Ambiental por Assunto "Abrolhos volcanic complex"

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    Modelo evolutivo da plataforma de Abrolhos: do paleógeno ao neógeno
    (Universidade Federal do Espírito Santo, 2020-08-31) Duarte, Romero Meyrelles; Quaresma, Valeria da Silva; https://orcid.org/0000-0002-7470-6642; http://lattes.cnpq.br/9423011006200936; https://orcid.org/0000-0002-5841-5167; http://lattes.cnpq.br/8723773038981510; Silva, Cleverson Guizan; https://orcid.org/; http://lattes.cnpq.br/2192755725741120; Rangel, Caio Vinicius Gabrig Turbay; https://orcid.org/0000-0003-0398-3391; http://lattes.cnpq.br/5332804895294756
    As part of the brazilian East Margin Continental Shelf, with distinct morphology from the continental shelf, the Abrolhos Shelf presents great ecological relevance, being the largest rhodoliths bank in the world and presenting the greatest south Atlantic biodiversity. However, the geological history of this shelf is still poorly known. It is known about an important Paleocene-Eocene magmatic event wich installed the Abrolhos Volcanic Complex, whose volcanic features can be seen with geophysical methods. Many volcanic seismic facies are could be indentified at the shelf, like seward dipping reflectors (SDR), lava deltas, lava flows, hyaloclastitic mounds, dikes and sills. In this scenario, from data generated by the oil industry, this research revisited concepts and data to propose an evolutionary model for the mixed sedimentation Abrolhos shelf, wich has started in the late-Eocene and crossed the Late Paleogene and all the Neogene periods as a barrier reef shelf in the northern portion, with an wide lagoon, and as an accretionary offlap shelf at the southern portion, where the siliciclastic influx would reach the slope at the lowstand tracts. After the seismic interpretations was proposed a four stage evolutive model for the mixed sedimentation shelf, starting ate the constitution os the Abrolhos Volcanic Complex, until the Pliocene, demonstrating the installation and evolution of the mixed sedimentation shelf