Details

Autor(en) / Beteiligte

• de Mahiques, Michel Michaelovitch
• Tassinari, Colombo Celso Gaeta
• Marcolini, Susana
• Violante, Roberto A.
• Figueira, Rubens Cesar Lopes
• da Silveira, Ilson Carlos Almeida
• Burone, Leticia
• de Mello e Sousa, Silvia Helena

Titel

Nd and Pb isotope signatures on the Southeastern South American upper margin: Implications for sediment transport and source rocks

Ist Teil von

• Marine geology, 2008-04, Vol.250 (1), p.51-63

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2008

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Neodymium and lead isotope values in sediment samples were used to interpret sediment transport and source rocks on the Southeastern South American upper margin. The sediments of the Argentinian margin exhibit an average ɛ Nd value of − 1.9, indicating the influence of the Andean rocks as sediment sources. Sediments from the Río de La Plata estuary show an average ɛ Nd value of − 9.6 which is similar to that of the Southern Brazilian Upper Margin. Finally, sediments of Southeastern Brazil, which are associated with the transport of the Brazil Current exhibit an average ɛ Nd of − 13.0. The Pb isotope signatures also confirm the differentiation of source rocks in the sedimentation of the study area. In addition, Pb isotopes helped to establish the extent of the influence of the Río de La Plata on the sedimentation of the Southern Brazilian margin. In terms of Pb isotopes the sediments from the Río de La Plata estuary and Southern Brazil are more radiogenic than those of Southeastern Brazil and the Argentinian margin.