The inference of mantle viscosity from an inversion of the Fennoscandian relaxation spectrum

Details The inference of mantle viscosity from an inversion of the Fennoscandian relaxation spectrum The inference of mantle viscosity from an inversion of the Fennoscandian relaxation spectrum

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993geoji.114...45m&link_type=abstract

Geophysical Journal International (ISSN 0956-540X), vol. 114, no. 1, p. 45-62.

Physics

58

Earth Mantle, Planetary Evolution, Relaxation Time, Rheology, Viscosity, Geophysical Fluids, Spherical Harmonics, Variational Principles

Scientific paper

The theory of Peltier (1976) for mantle viscosity is adopted, within the framework of nonlinear Bayesian Inference, to invert the Fennoscandian relaxation spectra derived by McConnell (1968). A set of rigorous constraints which all models for the viscosity variation beneath Fennoscandian must satisfy is derived. These constraints are used to test the plausibility of a wide class of viscosity models. It is shown that a model with a weak asthenosphere overlying an isoviscous 10 exp 21 Pa s deep mantle provides to good fit to the relaxation spectrum. This is also true of models with a thin sublithospheric low-viscosity zone overlying a two-layer deep mantle with a moderate jump in viscosity across 670 km depth, and models with a viscosity jump of between four and six across isoviscous upper and lower mantle regions.

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