Architecture of rifted continental margins and break-up evolution; insights from the South Atlantic, North Atlantic and Red Sea-Gulf of Aden conjugate margins

Online Access: Get full text
doi: 10.1144/SP369.17
Author(s): Mohriak, Webster Ueipass; Leroy, Sylvie
Author Affiliation(s): Primary:
Universidade do Estado do Rio de Janeiro, Departamento de Geologia Regional e Geotectonica, Rio de Janeiro, Brazil
Other:
Université Pierre et Marie Curie, France
Volume Title: Geological Society Special Publications
Source: Geological Society Special Publications, 369(1), p.497-535. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719 CODEN: GSLSBW
Note: In English. 166 refs.Online First; illus., incl. sects., 2 tables, geol. sketch maps
Summary: The tectonosedimentary development of the South Atlantic is compared with the Central Atlantic margins, which are associated with major episodes of magmatism during the Mesozoic continental break-up. Subsequently, the Cenozoic break-up in the North Atlantic led to the formation of the volcanic Norwegian-Greenland conjugate margins. The DSDP boreholes in the magma-poor Iberian-Newfoundland margins have confirmed the occurrence of exhumed mantle at the ocean-continent transition. This possibility has been suggested for the South Atlantic margins, but still lacks confirmation from drilling. The Red Sea and the Gulf of Aden may be considered as natural laboratories to study the break-up processes and formation of divergent continental margins. Using key geological and geophysical data, we compare some of the structures observed in incipient stages of basin formation between the African and the Arabian plates with the structures observed in older sedimentary basins associated with the Gondwana break-up. We also analyse deep seismic reflection profiles and potential field data at the continent-ocean boundary of these conjugate margins, using palinspastic reconstructions to define the corresponding seismic pairs. We conclude that the Red Sea and the Gulf of Aden display remarkable differences to the Iberian-Newfoundland margins, and notable similarities with the South Atlantic margins.
Year of Publication: 2012
Research Program: DSDP Deep Sea Drilling Project
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; African Plate; Arabian Plate; Arabian Sea; Atlantic Ocean; Basins; Boreholes; Canada; Conjugate margins; Continental margin; Deep Sea Drilling Project; Eastern Canada; Europe; Geophysical methods; Geophysical profiles; Geophysical surveys; Gondwana; Gulf of Aden; Iberian Peninsula; Indian Ocean; Magmatism; Mantle; Newfoundland; Newfoundland and Labrador; North Atlantic; Plate divergence; Plate tectonics; Reconstruction; Red Sea; Reflection methods; Rift zones; Rifting; Sedimentary basins; Seismic methods; Seismic profiles; South Atlantic; Southern Europe; Surveys; Tectonostratigraphic units
Record ID: 2012082421
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom

Similar Items