Mantle skewness and ridge segmentation

Satish C. Singh and Ken C. Macdonald
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Satish C. Singh: * Laboratoire de Géosciences Marines, Institut de Physique du Globe de Paris, 4 place Jussieu, Paris 75252, France. singh@ipgp.jussieu.fr
Ken C. Macdonald: University of California

Nature, 2009, vol. 458, issue 7241, E11-E12

Abstract: Abstract Arising from: D. R. Toomey, D. Jousselin, R. A. Dunn, W. S. D. Wilcock & R. S. Detrick Nature 446, 409–414 (2007)10.1038/nature05679 ; Toomey et al. reply Mantle upwelling is generally assumed to be symmetric. Toomey et al.1 observe low seismic-wave velocity in off-axis mantle, and suggest that mantle upwelling is skewed, which has important implications for asthenospheric flow, ridge segmentation, crustal accretion, and volcanic, tectonic and hydrothermal vent activities along the ridge axis. However, we point out here that the mantle low-velocity zone (MLVZ) presented by Toomey et al.1 is not constrained by their data. We conclude that inferences pertaining to ridge segmentation and mantle flow are not reliable.

Date: 2009
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DOI: 10.1038/nature07887

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