HR: 09:45h
AN: T11G-08    [Abstracts]
TI: Ridge migration, asthenospheric flow and the origin of magmatic segmentation in the global mid-ocean ridge system
AU: * Katz, R F
EM: katz@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964 United States
AU: Spiegelman, M
EM: mspieg@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964 United States
AU: Carbotte, S
EM: carbotte@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964 United States
AB: Global observations of mid-ocean ridge (MOR) bathymetry demonstrate an asymmetry in axial depth across ridge offsets that is correlated with the direction of ridge migration. Motivated by these observations, we have developed two-dimensional numerical models of asthenospheric flow and melting beneath a migrating MOR. The modification of the flow pattern produced by ridge migration leads to an asymmetry in melt production rates on either side of the ridge. By coupling a simple parametric model of three dimensional melt focusing to our simulations, we generate predictions of axial depth differences across offsets in the MOR. These predictions are quantitatively consistent with the observed asymmetry.
UR: http://www.ldeo.columbia.edu/\~{}katz/publications/Katz\_et\_al\_GRL04.pdf
DE: 3035 Midocean ridge processes
DE: 3040 Plate tectonics (8150, 8155, 8157, 8158)
DE: 3210 Modeling
DE: 3230 Numerical solutions
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting