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<p>The Santos Basin, located in the southwestern Atlantic, receives limited sediment input from the adjacent continental area, making it an ideal location to study the influence of ocean currents on sedimentary processes. This study examines the grain size characteristics of bottom sediments on the continental slope of the Santos Basin, with a focus on depths ranging from 150 to 2500&#xa0;m. Through grain size analysis, including end-member modeling and the concept of sortable silt, the research aims to understand sediment transport and deposition patterns influenced by hydrodynamic forces, particularly the Brazil Current (BC) and the Intermediate Western Boundary Current. Surface sediment samples were collected and analyzed, revealing three distinct grain size populations: very fine sand, medium silt, and fine silt. The distribution of these populations is closely linked to bathymetric trends and current speeds, with coarser sediments associated with the BC meandering and finer sediments deposited in areas of lower current velocities. This study highlights the crucial role of ocean currents in shaping the sediment distribution in the Santos Basin.</p>

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Grain-size end-members and sortable silt of the terrigenous fraction associated with seafloor-current processes and depositional domains on the continental slope of the Santos basin (SW Atlantic margin)

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Michel Michaelovitch de Mahiques,
  • César Barbedo Rocha,
  • Paulo Alves de Lima Ferreira,
  • Samara Cazzoli y Goya,
  • Lucas Santos Nunes,
  • Rubens Cesar Lopes Figueira

摘要

The Santos Basin, located in the southwestern Atlantic, receives limited sediment input from the adjacent continental area, making it an ideal location to study the influence of ocean currents on sedimentary processes. This study examines the grain size characteristics of bottom sediments on the continental slope of the Santos Basin, with a focus on depths ranging from 150 to 2500 m. Through grain size analysis, including end-member modeling and the concept of sortable silt, the research aims to understand sediment transport and deposition patterns influenced by hydrodynamic forces, particularly the Brazil Current (BC) and the Intermediate Western Boundary Current. Surface sediment samples were collected and analyzed, revealing three distinct grain size populations: very fine sand, medium silt, and fine silt. The distribution of these populations is closely linked to bathymetric trends and current speeds, with coarser sediments associated with the BC meandering and finer sediments deposited in areas of lower current velocities. This study highlights the crucial role of ocean currents in shaping the sediment distribution in the Santos Basin.