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vol.58 número especial 2The Southern Brazilian shelf: general characteristics, quaternary evolution and sediment distributionOccurrence of storm-generated bedforms along the inner continental shelf: Southeastern Brazil índice de autoresíndice de assuntospesquisa de artigos
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Brazilian Journal of Oceanography

versão On-line ISSN 1982-436X

Resumo

WESCHENFELDER, Jair; CORREA, Iran Carlos Stalliviere; ALIOTTA, Salvador  e  BAITELLI, Ricardo. Paleochannels related to late quaternary sea-level changes in Southern Brazil. Braz. j. oceanogr. [online]. 2010, vol.58, n.spe2, pp.35-44. ISSN 1982-436X.  http://dx.doi.org/10.1590/S1679-87592010000600005.

The geological evolution of the continental shelf and in the coastal zone of southern Brazil during the Quaternary period is addressed in this study. High-resolution seismic records obtained at the Patos Lagoon revealed the presence of channels that deeply dissected the coastal zone before the formation of the modern, low-relief, coastal plain. Two periods of channel incision are inferred, based mainly on seismic records. The paleodrainage paths mapped from the seismic records can be connected with those recognized by previous studies on the adjacent continental shelf and slope. Upstream, the drainage incised mainly into the coastal prism deposited during previous sea-level highstand events. The paleodrainage network, recognized on the coastal plain and continental shelf, represents a river-shelf system, linking the drainage basin to the depositional settings on the marginal basin, bypassing the continental shelf exposed during a forced regression event. The drainage incised into the coastal plain and continental shelf of Rio Grande do Sul played an important role in the basin-margin architecture, facies distribution and accommodation during the Quaternary sea-level fluctuations.

Palavras-chave : seismic survey; coastal evolution; incised valleys; Patos Lagoon.

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