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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: GEO-MARINE LETTERS; v. 45, n. 1, p. 13-pg., 2025-03-01.

Resumo

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 degrees S to 37 degrees 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 Paran & aacute; 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. (AU)

• Processo FAPESP: 20/14356-5 - A Bifurcação de Santos: presente e passado
• Beneficiário: Michel Michaelovitch de Mahiques
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/22194-0 - Feições anômalas de fundo no talude superior do Sul do Brasil
• Beneficiário: Michel Michaelovitch de Mahiques
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/06147-5 - Incremento da capacidade de pesquisa em oceanografia no estado de São Paulo
• Beneficiário: Michel Michaelovitch de Mahiques
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 14/08266-2 - Feições morfológicas do talude continental da margem Sudeste do Brasil: tectônica ativa versus condições oceanográficas modernas
• Beneficiário: Michel Michaelovitch de Mahiques
• Modalidade de apoio: Auxílio à Pesquisa - Regular