Evolução da margem atlântica equatorial do Brasil: Três fases distensivas

• Autor(a) principal: Soares Júnior, Adilson Viana [UNESP]
• Data de Publicação: 2008
• Outros Autores: Costa, João Batista Sena, Hasui, Yociteru [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.periodicos.rc.biblioteca.unesp.br/index.php/geociencias/article/view/3371; http://hdl.handle.net/11449/70760
• topic: Central Atlantic ocean; Equatorial Atlantic ocean; Extensional events; Gondwana; Paleogeography; Albian; equatorial dynamics; graben; landform evolution; magmatism; paleogeography; Pangaea; rupture; Triassic; triple junction; uplift; Atlantic Ocean; Atlantic Ocean (Central); Atlantic Ocean (Equatorial); Brazil; Foz do Amazonas Basin; Maranhao Basin; Parana Basin; Potiguar Basin; Rio Grande do Norte; South America

The extension of the Pangaea started in the Upper Triassic and evolved to uplifts, magmatism and development a triple junction during the Mesozoic, and opening the Central Atlantic Ocean. The Brazilian Equatorial Atlantic margin was formed in three Mesozoic extensional events. The first event is recorded by the Calçoene Graben of the Foz do Amazonas Basin. The second event started in the Valangian and is recognized by the enlargement of the Foz do Amazonas Basin, formation of the Marajó and Grajaú basins, and the Gurupi Graben System. The third event commenced in the Albian related to northwestward progression of the rift system, which enlarged the Foz do Amazonas and formed the Potiguar, Ceará, Barreirinhas and Pará-Maranhão basins. At the end of the Lower Cretaceous the movements attenuated in the Marajó Basin and Gurupi Graben System; the extension concentrated in the Foz do Amazonas, Pará-Maranhão and Barreirinhas basins, and evolved to continental rupture of northern South America and western Africa opening of the Equatorial Atlantic Ocean.