Ridge migration and asymmetric sea-floor spreading

Seth Stein*, H. J. Melosh, J. B. Minster

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

We propose that asymmetric sea-floor spreading occurs as a consequence of the relative motion between ridges and slow-moving mantle material below. A fluid mechanical model of asymmetric spreading predicts that the trailing flank of a ridge migrating with respect to the mantle spreads fastest. Observed asymmetries are compared to those predicted by ridge migration velocities. Although the magnitude of the asymmetry appears to depend as much on local effects as on the migration of the ridge, the direction of asymmetry agrees with our prediction in most locations. In contrast, models in which the ridge attempts to remain above a source fixed in the mantle predict the opposite direction of asymmetry. Other models, which attribute asymmetric spreading to asymmetric cooling, require large deviations from the standard depth-age relationship, while our model does not.

Original languageEnglish (US)
Pages (from-to)51-62
Number of pages12
JournalEarth and Planetary Science Letters
Volume36
Issue number1
DOIs
StatePublished - Aug 1977

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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