Viscosity and thickness of the sub-lithospheric low-viscosity zone - Constraints from geoid and depth over oceanic swells

Details Viscosity and thickness of the sub-lithospheric low-viscosity zone - Constraints from geoid and depth over oceanic swells Viscosity and thickness of the sub-lithospheric low-viscosity zone - Constraints from geoid and depth over oceanic swells

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..89...84c&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 89, no. 1, June 1988, p. 84-102. CNES-CNRS-ESA-supported research.

Physics

30

Geoids, Lithosphere, Ocean Bottom, Viscosity, Earth Mantle, Rayleigh Number, Water Depth

Scientific paper

This paper investigates the constraints on the properties of a sublithospheric shallow low-viscosity zone (LVZ), using a world-wide survey of the geoid-to-depth anomalies ratio (GDR) at oceanic hotspot swells. The effects on the GDR of the Rayleigh number, the magnitude of the viscosity drop, and the thickness of the LVZ were investigated by modeling upper-mantle convection across a shallow viscosity-drop interface. It is shown that, for viscosity drops across the base of the LVZ a greater than one order of magnitude, the GDR is strongly dependent on the depth of shallow interfaces, such as the lithosphere/athenosphere boundary, and on the LVZ thickness. Consequently, the empirical trend in the GDR can be accounted for by the thickening of the lithosphere with age, provided it occurs at the expense of a LVZ whose base is at a fixed depth (around 200 km).

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