THE MORPHOLOGY OF THE CONTINENTAL SLOPE OFF THE EASTERN COAST OF THE STATE OF CEARÁ, BRAZILIAN EQUATORIAL MARGIN
DOI:
https://doi.org/10.5380/qeg.v16i1.100625Keywords:
submarine canyons, multibeam bathymetry, marine geomorphologyAbstract
Mapping the seafloor is a global objective of the United Nations Decade of Ocean Science. In the case of the Brazilian Equatorial Margin (BEM), a region considered an emerging petroleum province, understanding the seafloor is even more urgent and essential to minimize geological risks in offshore infrastructure projects and to monitor environmentally sensitive areas. This research aims to investigate the morphology of the continental slope off the eastern coast of the state of Ceará, in the sector adjacent to the Jaguaribe River, within the BEM. To achieve this, multibeam bathymetric data acquired through the SeabedMap Project and a seismic volume provided by the ANP were analyzed to characterize the main submarine features and assess geological and oceanographic processes influencing seabed stability. A total of 13 submarine canyons with “V” and “U”-shaped profiles were identified. Nine canyons were classified as being in a transitional evolutionary stage, and four in a mature stage. Their lengths range from 11.2 to 45.1 km, widths from 1 to 4.1 km, and depths between 0.2 and 0.5 km. Four of the canyons are sinuous, and two exhibit a slope of 8°, which is above the regional average. Additional features mapped include gullies ranging from 0.45 to 5.1 km in length, mass movement deposits with semicircular and triangular geometries, five circular depressions, dunes, and several sediment ridges. The mapping of these features provided key insights into the geological and oceanographic processes shaping the deep marine depositional environment in the region. The results offer valuable information to support marine spatial planning, mitigate risks associated with the installation of submarine cables and pipelines in unstable areas, and contribute to future research on geohabitats and to the environmental management of this portion of the continental slope of the equatorial Atlantic.
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Copyright (c) 2025 Isabelly Maria Maia Ferro, Dakson Silva da Costa, Mary Lucia Da Silva Nogueira, Guilherme Augusto Mendonça Maia, João Capistrano Abreu Neto, Helenice Vital, Narelle Maia de Almeida

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