Skip to Main Content
Book Chapter

Santos Drift System: Stratigraphic organization and implications for late Cenozoic palaeocirculation in the Santos Basin, SW Atlantic Ocean

By
Cláudio S. L. Duarte
Cláudio S. L. Duarte
Petrobras S.A./E&P-Exploration, 65, República do Chile Av., 13th Floor, Rio de Janeiro, RJ, 20031-912, Brazil (e-mail: aviana@petrobras.com.br)
Search for other works by this author on:
Adriano R. Viana
Adriano R. Viana
Petrobras S.A./E&P-Exploration, 65, República do Chile Av., 13th Floor, Rio de Janeiro, RJ, 20031-912, Brazil (e-mail: aviana@petrobras.com.br)
Search for other works by this author on:
Published:
January 01, 2007

Abstract:

High-quality 2D and 3D seismic data were analysed to investigate the stratigraphic organization of the sedimentary deposits and the impact of the palaeocirculation of the SW Atlantic Ocean in the construction of the Santos Basin slope from late Palaeogene to Recent time. Seven seismic sequences were identified based on their external geometry, internal seismic pattern and seismic boundaries. A correlation between these sequences, the glacio-eustatic curves and the major climatic–palaeoceanographic events was attempted. The base of the studied sequences is the c. 28 Ma intra-Oligocene Rupelian–Chatian unconformity. Six other seismic horizons corresponding to the sequence boundaries were mapped ranging from the late Oligocene to the Pliocene. Variations in the bottom-current intensity were characterized by the seismic pattern of each sequence and by the evolution of margin physiography. A 100 km long channel-like gutter, the Santos Channel, was excavated at the foot of an intra-slope escarpment. It was the locus of major flow circulation until the middle Miocene, when the margin physiography reorganization transferred the main axis of deep current action downslope and excavated the São Paulo Channel at the foot of the present continental slope. Two major contourite drifts were accumulated in response to the different combinations of bottom-current axis position and slope physiography. Those drifts constitute the Santos Drift System. Conversely to the present-day circulation pattern, with southward flow above the slope dominated by the western boundary Brazil Current, both at surface and deep waters, the geological record indicates that the palaeocirculation in the Santos Basin was marked by the opposite sense of circulation of surface waters (southward palaeo Brazil Current) and of the intermediate to deep waters (northward Southern Ocean Current). The study indicates that periods of relative sea-level rise to highstands correspond to increase in drift accumulation whereas during lowstands slope drift sedimentation is reduced.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

Geological Society, London, Special Publications

Economic and Palaeoceanographic Significance of Contourite Deposits

A. R. Viana
A. R. Viana
Petrobras, Brazil
Search for other works by this author on:
M. Rebesco
M. Rebesco
Petrobras, Brazil
Search for other works by this author on:
Geological Society of London
Volume
276
ISBN electronic:
9781862395244
Publication date:
January 01, 2007

GeoRef

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now