Skip to Main Content
Book Chapter

Non-volcanic rifted margins, continental break-up and the onset of sea-floor spreading: some outstanding questions

By
G. Boillot
G. Boillot
Observatoire Océanologique, Géosciences Azur, B.P. 48, 06235 Villefranche-sur-Mer, France (e-mail: boillot@obs-vlfr.fr)
Search for other works by this author on:
N. Froitzheim
N. Froitzheim
Geologisches Institut, Nussallee 8, D-53115 Bonn, Germany
Search for other works by this author on:
Published:
January 01, 2001

Abstract

During the last 20 years, regional studies on the West Iberia margin and on the former margins of the Tethys have considerably advanced the understanding of processes related to continental break-up and the onset of sea-floor spreading. However, some questions remain outstanding. To tentatively answer these, a coherent interpretation of available data is proposed, based on the detachment fault concept applied to the continental as well as the oceanic lithosphere, and on the hypothesis of a multi-staged rifting process. The interpretation addresses the nature of the lower crust beneath non-volcanic passive margins, the origin of ophicalcites, the probable time gap between syn- or post-rift crystallization of gabbros and extrusion of basalts on the sea floor, and the significance of dipping reflectors within oceanic lithosphere adjacent to non-volcanic passive margins. The interpretation also considers the symmetry v. asymmetry of continental rifting and break-up, the location of the ocean–continent boundary, and the possible association of magnetic quiet zones with ultramafic sea floor (serpentinized peridotite) bordering non-volcanic passive margins.

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

Figures & Tables

Contents

Geological Society, London, Special Publications

Non-Volcanic Rifting of Continental Margins: A Comparison of Evidence from Land and Sea

R. C. L. Wilson
R. C. L. Wilson
The Open University, UK
Search for other works by this author on:
R. B. Whitmarsh
R. B. Whitmarsh
Southampton Oceanography Centre, UK
Search for other works by this author on:
B. Taylor
B. Taylor
University of Hawaii, Hawaii
Search for other works by this author on:
N. Froitzheim
N. Froitzheim
University of Bonn, Germany
Search for other works by this author on:
Geological Society of London
Volume
187
ISBN electronic:
9781862394353
Publication date:
January 01, 2001

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