Sequential faulting explains the asymmetry and extension discrepancy of conjugate margins

César R. Ranero () and Marta Pérez-Gussinyé ()
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César R. Ranero: ICREA at CSIC, Barcelona Center for Subsurface Imaging, Instituto de Ciencias del Mar, CSIC, Passeig Marítim de la Barcelona 37-49, 08003, Barcelona, Spain
Marta Pérez-Gussinyé: Royal Holloway, University of London

Nature, 2010, vol. 468, issue 7321, 294-299

Abstract: Faulting at the margins Rifted continental margins are the sites that record the thinning and break-up of continents to form new oceans. César Ranero and Marta Pérez-Gussinyé use seismic imaging to accurately measure fault extension at the conjugate West Iberia and Newfoundland margins, and compare this to crustal thinning. They use these observations to create a balanced kinematic model of rifting that resolves the extension discrepancy — in which crustal thinning appears to be greater than the extension caused by brittle faulting — by producing both fault-controlled crustal thinning, which progresses from a rift basin to the asymmetric structure, and extreme thinning of conjugate rifted margins.

Date: 2010
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DOI: 10.1038/nature09520

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