A revised paleo-reconstruction of the Equatorial Atlantic from new magnetic, gravity, and seismic reflection data, offshore Guinea

Russ Edge, Roy A Johnson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Guinea margin, situated within the Equatorial Atlantic represents the final point of separation between Africa and South America during Triassic to Cretaceous rifting to form the North and South Atlantic. Despite being in such a tectonically interesting region, relatively little data have been published about the Guinean continental margin. Consequently, prior plate reconstructions within the Equatorial Atlantic lack sufficient detail to provide a fully reasonable explanation for the complex rift structure observed within new 2-D and 3-D seismic datasets. New observations drawn from the seismic data, and local gravity and magnetic data, permit development of a new paleo-reconstruction model across the Guinea Plateau. Furthermore, using magnetic reversals, fracture zones have been extended farther towards the continental margin. This has provided further accuracy and constraint of plate motions, and suggests a greater north-south extensional component is required during initial rifting. These revised plate motions and their timings have provided information on fault kinematics that are observed within the 3-D seismic data, facilitating a more accurate basin development framework. The creation of this more-detailed Equatorial Atlantic plate reconstruction not only aids in better understanding of rift evolution, but presents opportunities for increased insight into how global oceanic circulation patterns and climate change are affected by tectonic activity.

Original languageEnglish (US)
Title of host publicationSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting, SEG 2013
Subtitle of host publicationExpanding Geophysical Frontiers
PublisherSociety of Exploration Geophysicists
Pages3021-3025
Number of pages5
ISBN (Print)9781629931883
DOIs
StatePublished - Jan 1 2013
EventSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting: Expanding Geophysical Frontiers, SEG 2013 - Houston, United States
Duration: Sep 22 2013Sep 27 2013

Other

OtherSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting: Expanding Geophysical Frontiers, SEG 2013
CountryUnited States
CityHouston
Period9/22/139/27/13

ASJC Scopus subject areas

  • Geophysics

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    Edge, R., & Johnson, R. A. (2013). A revised paleo-reconstruction of the Equatorial Atlantic from new magnetic, gravity, and seismic reflection data, offshore Guinea. In Society of Exploration Geophysicists International Exposition and 83rd Annual Meeting, SEG 2013: Expanding Geophysical Frontiers (pp. 3021-3025). Society of Exploration Geophysicists. https://doi.org/10.1190/segam2013-1425.1