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Geological Society, London, Special Publications; 2008; v. 294; p. 239-256;
DOI: 10.1144/SP294.13
© 2008 Geological Society of London

Articles

West Gondwana amalgamation based on detrital zircon ages from Neoproterozoic Ribeira and Dom Feliciano belts of South America and comparison with coeval sequences from SW Africa

M. A. S. Basei1, H. E. Frimmel2, A. P. Nutman3,4 & F. Preciozzi5

1 Instituto de Geociências, Universidade de São Paulo, São Paulo, Rua do Lago 562, SP, Brazil (e-mail: baseimas{at}usp.br)
2 Department of Geological Sciences, University of Cape Town, Rondebosch 7701, South Africa, Present address: Institute of Mineralogy, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
3 Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia
4 Beijing SHRIMP Centre, Chinese Academy of Geological Sciences, 26, Baiwanzhuang Road, Beijing, 100037 China
5 Departamento de Geología, Instituto de Geología y Paleontología, Universidad de la República, Iguá 4225, Malvin Norte, CP 11400, Montevideo, Uruguay

Neoproterozoic–Cambrian amalgamation of West Gondwana involved the collision of several terranes of older crust that are now in eastern South America and western Africa. U–Pb (SHRIMP) detrital zircon ages from representative metasedimentary units of the Ribeira and Dom Feliciano belts (South America) and Gariep and Damara belts (Africa) provide constraints on the possible sediment source areas across probable suture zones. Ribeira detrital zircons are Palaeoproterozoic and Archaean. For the Dom Feliciano Belt, a contribution of Meso- and Neoproterozoic zircons is present, which definitely indicate Neoproterozoic sedimentation. It is proposed that the inflow of material to the Ribeira basin was essentially derived from the Paranapanema and Rio de la Plata cratons, whereas for the Damara and Gariep–Rocha belts source areas were from the Namaqua Belt. The Dom Feliciano Belt received sediments from the South American side and to a lesser degree from African sources. These results highlight the differences in the detrital zircon signatures across a proposed West Gondwanan suture, with those in the west being derived from distinctive South American basement sources and those in the east from distinctive African sources.





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R. S. Schmitt, R. A. J. Trouw, W. R. Van Schmus, and C. W. Passchier
Cambrian orogeny in the Ribeira Belt (SE Brazil) and correlations within West Gondwana: ties that bind underwater
Geological Society, London, Special Publications, 2008; 294: 279 - 296.
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