Subducted slabs and the geoid - Constraints on mantle rheology and flow

Details Subducted slabs and the geoid - Constraints on mantle rheology and flow Subducted slabs and the geoid - Constraints on mantle rheology and flow

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.6003h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, July 10, 1984, p. 6003-6015. Research supported by the Alfred P. Sloa

Physics

Geophysics

377

Anomalies, Earth Mantle, Flow Measurement, Geoids, Mass Distribution, Rheology, Boundary Layers, Geophysics, Mathematical Models, Planetary Mantles, Structural Properties (Geology), Subduction (Geology), Symmetrical Bodies

Scientific paper

The total geoid anomaly which is the result of a given density contrast in a convecting viscous earth is affected by the mass anomalies associated with the flow induced deformation of the upper surface and internal compositional boundaries, as well as by the density contrast itself is discussed. If the internal density contrasts can be estimated, the depth and variation of viscosity with depth of the convecting system can be constrained. The observed long wavelength geoid is highly correlated with that predicted by a density model for seismically active subducted slabs. The amplitude of the correlation is explained if the density contrasts associated with subduction extend into the lower mantle or if subducted slabs exceeding 350 km in thickness are piled up over horizontal distances of thousands of km at the base of the upper mantle. Mantle wide convection in a mantle that has a viscosity increasing with depth provides the explanation of the long-wavelength geoid anomalies over subduction zones. Previously announced in STAR as N83-22874

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