Origin of the Rio Grande Rise–Walvis Ridge reviewed integrating palaeogeographic reconstruction, isotope geochemistry and flexural modelling
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Published:January 01, 2013
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CiteCitation
Naomi Ussami, Carlos Alberto Moreno Chaves, Leila Soares Marques, Marcia Ernesto, 2013. "Origin of the Rio Grande Rise–Walvis Ridge reviewed integrating palaeogeographic reconstruction, isotope geochemistry and flexural modelling", Conjugate Divergent Margins, W. U. Mohriak, A. Danforth, P. J. Post, D. E. Brown, G. C. Tari, M. Nemčok, S. T. Sinha
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Abstract
A palaeogeographical reconstruction of the South American and African continents back to anomaly C34 (84 Ma) brings together the Rio Grande Rise (RGR) and the central portion of the Walvis Ridge (WR), thus the RGR–WR aseismic ridges may have a common origin. If the construction of the RGR–WR basaltic plateau took place mainly between 89 and 78 Ma, as indicated by the ages of the basalts sampled by DSDP wells, then the basaltic magmas are the result of an ‘on-ridge’ volcanism. Once separated, the normal sea-floor spreading and thermal subsidence of the RGR and WR ridges continued until approximately...
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Contents
Conjugate Divergent Margins

The main focus of the book is the geological and geophysical interpretation of sedimentary basins along the South, Central and North Atlantic conjugate margins, but concepts derived from physical models, outcrop analogues and present-day margins are also discussed in some chapters. There is an encompassing description of several conjugate margins worldwide, based on recent geophysical and geological datasets. An overview of important aspects related to the geodynamic development and petroleum geology of Atlantic-type sedimentary basins is also included. Several chapters analyse genetic mechanisms and break-up processes associated with rift-phase structures and salt tectonics, providing a full description of conjugate margin basins based on deep seismic profiles and potential field methods.
GeoRef
- Africa
- alkalic composition
- alkaline earth metals
- Atlantic Ocean
- Atlantic Ocean Islands
- basalts
- bathymetry
- Brazil
- Cenozoic
- Coniacian
- continents
- Cretaceous
- Deep Sea Drilling Project
- Eocene
- flexure
- geochemistry
- igneous rocks
- isotope ratios
- isotopes
- large igneous provinces
- lead
- lithosphere
- magmatism
- mantle
- Mesozoic
- metals
- Paleogene
- paleogeography
- Parana Brazil
- Pb-206/Pb-204
- radioactive isotopes
- reconstruction
- Rio Grande Rise
- Santonian
- sea-floor spreading
- Senonian
- South America
- South Atlantic
- Sr-87/Sr-86
- stable isotopes
- strontium
- Tertiary
- tholeiite
- Tristan da Cunha
- Upper Cretaceous
- volcanic rocks
- volcanism
- Walvis Ridge
- Guyot Province