A new formalism for inferring mantle viscosity based on estimates of post glacial decay times: Application to RSL variations in N.E. Hudson Bay

Details A new formalism for inferring mantle viscosity based on estimates of post glacial decay times: Application to RSL variations in N.E. Hudson Bay A new formalism for inferring mantle viscosity based on estimates of post glacial decay times: Application to RSL variations in N.E. Hudson Bay

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2183m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 20, p. 2183-2186

Physics

16

Earth Mantle, Earth Movements, Estimates, Fluid Flow, Formalism, Hudson Bay (Canada), Polar Regions, Sea Level, Viscosity, Geomorphology, Glaciers, Ice Floes, Mathematical Models, Thermal Degradation

Scientific paper

We outline a new parameterization which, when applied to RSL (relative sea level) curves for sites within previously glaciated regions, yields a data set which is insensitive to details of the ice loading history over the region. The parameterization recognizes the exponential-like form of the RSL histories in such regions, and it provides a set of estimates for the characteristic decay time of that form. These estimates permit robust inferences of mantle viscosity below previously glaciated regions which are relatively unbiased by assumptions regarding the details of the surface ice cover. We apply the new parameterization to a small set of oft-studied RSL curves in N.E. Hudson Bay. Using forward and inverse analyses of the decay time estimates we derive constraints on the radial profile of mantle viscosity below the region, and assess a set of previously proposed models for the viscosity profile below the area.

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