Caracterização das principais feições superficiais de fundo e em subsuperfície no limite sudoeste da Baía de Macapá, Canal do Norte, Rio Amazonas
DOI:
https://doi.org/10.5914/tropocean.v45i1.15197Palabras clave:
Morfologia, formas de fundo, sismofácies, paleocanalResumen
A Baía de Macapá, por estar inserida a zona de médio estuário do Rio Amazonas, apresenta vestígios de alterações morfológicas diferenciadas pela forte dinâmica em um curto intervalo de tempo. O reflexo de tais alterações pode ser observado nas modificações morfoestruturais presentes no leito e subsuperfície. A análise dos perfis sísmicos em alta resolução pelo intervalo de frequência de 0,7 kHz a 12,0 kHz revela que as características apresentadas nas formas de fundo desencadeiam os processos modeladores do padrão de reflexão observados nos refletores em subsuperfície. Através desta relação foi possível identificar a predominância de cinco formas de fundo, quatro unidades estruturais e cinco sismofácies com o destaque para a identificação de uma feição de paleocanal. Observou-se que as variações morfológicas do leito são influenciadas pela constante atuação dos processos hidrodinâmicos e sedimentares ocorrentes periodicamente e vice-versa, corroborando para correlação entre as feições superficiais de fundo e as feições em subsuperfície.
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