Does infiltration of core material into the lower mantle affect the observed geomagnetic field?

Details Does infiltration of core material into the lower mantle affect the observed geomagnetic field? Does infiltration of core material into the lower mantle affect the observed geomagnetic field?

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...73...29p&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 73, Issue 1-2, p. 29-37.

Physics

36

Scientific paper

A quantitative estimate of the depth of penetration of liquid iron from the core into the base of the lower mantle has been obtained, from laboratory data and theoretical models. The thickness of the infiltrated layer is found to be of the order of 1-100 m depending on the grain size of the mantle material. Even with the assumption that convection in the D'' layer entrains the electrically conducting core fluid over 100 km, the effective conductivity of the layer is hardly modified and the perturbation caused to the secular variation field is negligible. The same conclusion obtains in the improbable limiting case where all the infiltrated core fluid is gathered in a single mass.

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