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Asymmetric sea-floor spreading caused by ridge–plume interactions

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.

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Figure 1: Crustal accretion rates of conjugate plates in four areas, illuminated by marine gravity anomalies27.
Figure 2: Spreading asymmetry by stage (continuous lines) versus time for areas marked in Fig. 1.
Figure 3: Rate of the ridge-normal component of the migration of mid-ocean ridges relative to the mantle by stage versus time (solid lines).
Figure 4: Cumulative rate of ridge migration versus spreading asymmetry and estimated errors.

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Acknowledgements

We thank N. Sleep and S. Stein for comments on the manuscript, and R. Buick and A. Dutkiewicz for discussions.

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Correspondence to R. Dietmar Müller.

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Müller, R., Roest, W. & Royer, JY. Asymmetric sea-floor spreading caused by ridge–plume interactions. Nature 396, 455–459 (1998). https://doi.org/10.1038/24850

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