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<p>This study investigated the geochemical characteristics of bulk metal (Al, Ca, Fe, K, Mg, Mn, Ti, Ba, Cr, Sc, Sr, and V) contents in 76 sediment samples from the upper to middle continental slope of the Southwestern Atlantic margin, ranging in depth from 234 to 1538&#xa0;m below sea level and spanning latitudes from 21°S to 37°S. This research aims to identify the primary geochemical indicators that can be used to interpret the sediment sources and interbasin relationships among the Campos, Santos, Pelotas, and Punta del Este Basins. Building on previous conceptual models, this work examines the influence of Argentinean and Paraná Basin sources. Additionally, the effectiveness of linear discriminant analysis (LDA) in identifying geochemical differences between sediment basins in the southwestern Atlantic margin is explored, and a correct discrimination of more than 95% is obtained. This study delves into depositional conditions and sediment sources, and the metal signatures in each one of the basins are evaluated. The distribution of sediments and their relationships with ocean circulation patterns are also examined. This comprehensive analysis enhances our understanding of sediment dynamics and geochemical indicators in the context of the complex oceanographic and geological setting of the Southwestern Atlantic margin.</p>

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Tracing geochemical footprints in surface sediments of the southwest atlantic margin: a journey through the Santos, Campos, Pelotas, and Punta del Este Basins

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Rosangela Felicio dos Santos,
  • Rubens Cesar Lopes Figueira,
  • Leticia Burone,
  • Carlos Eduardo de Rezende,
  • Michel Michaelovitch de Mahiques

摘要

This study investigated the geochemical characteristics of bulk metal (Al, Ca, Fe, K, Mg, Mn, Ti, Ba, Cr, Sc, Sr, and V) contents in 76 sediment samples from the upper to middle continental slope of the Southwestern Atlantic margin, ranging in depth from 234 to 1538 m below sea level and spanning latitudes from 21°S to 37°S. This research aims to identify the primary geochemical indicators that can be used to interpret the sediment sources and interbasin relationships among the Campos, Santos, Pelotas, and Punta del Este Basins. Building on previous conceptual models, this work examines the influence of Argentinean and Paraná Basin sources. Additionally, the effectiveness of linear discriminant analysis (LDA) in identifying geochemical differences between sediment basins in the southwestern Atlantic margin is explored, and a correct discrimination of more than 95% is obtained. This study delves into depositional conditions and sediment sources, and the metal signatures in each one of the basins are evaluated. The distribution of sediments and their relationships with ocean circulation patterns are also examined. This comprehensive analysis enhances our understanding of sediment dynamics and geochemical indicators in the context of the complex oceanographic and geological setting of the Southwestern Atlantic margin.