Asymmetric sea-floor spreading caused by ridge–plume interactions

R. Dietmar Müller (), Walter R. Roest and Jean-Yves Royer
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R. Dietmar Müller: The University of Sydney, School of Geosciences, Building F05
Walter R. Roest: Geological Survey of Canada
Jean-Yves Royer: Unité Mixte de Recherche 6526, Géosciences Azur, Quai de la Darse - BP 48

Nature, 1998, vol. 396, issue 6710, 455-459

Abstract: Abstract Crustal accretion at mid-ocean ridges is generally modelled as a symmetric process. Regional analyses, however, often show either small-scale asymmetries, which vary rapidly between individual spreading corridors, or large-scale asymmetries represented by consistent excess accretion on one of the two separating plates over geological time spans1,2,3,4,5,6. In neither case is the origin of the asymmetry well understood. Here we present a comprehensive analysis of the asymmetry of crustal accretion over the past 83 Myr based on a set of self-consistent digital isochrons7 and models of absolute plate motion8,9. We find that deficits in crustal accretion occur mainly on ridge flanks overlying one or several hotspots. We therefore propose that asymmetric accretion is caused by ridge propagation towards mantle plumes or minor ridge jumps sustained by asthenospheric flow10,11 between ridges and plumes. Quantifying the asymmetry of crustal accretion provides a complementary approach to that based on geochemical12 and other geophysical data13,14 in helping to unravel how mantle plumes and mid-ocean ridges are linked through mantle convection processes.

Date: 1998
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DOI: 10.1038/24850

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