Density structure and buoyancy of the oceanic lithosphere revisited

Details Density structure and buoyancy of the oceanic lithosphere revisited Density structure and buoyancy of the oceanic lithosphere revisited

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410302a&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 10, CiteID L10302

Physics

9

Mineralogy And Petrology: Mantle Processes (1038), Mineral Physics: Equations Of State, Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

The density structure of the lithospheric and sublithospheric oceanic mantle is assessed with an integrating methodology that incorporates mineral physics, geochemical, petrological, and geophysical data. Compressibility, partial melting, and compositional layering are considered in addition to the standard thermal modelling. The results indicate that due to differences in the degree of melt depletion and crust segregation, the depth-averaged density of old oceanic plates with thermal thicknesses of ~105 +/- 5 km is always lower than the density of the underlying sublithospheric mantle. Moreover, representative depth-averaged density contrasts between the plate and the adiabatic mantle, ${\overline{\Delta \rho}, do not exceed values of ~40 kg m-3, in contrast to what is assumed (${\overline{\Delta \rho} > 70 kg m-3) in many geodynamic models. Thus, the role of ${\overline{\Delta \rho} in triggering/assisting processes such as subduction initiation may be less critical than previously thought.

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