The old continental shields stability related to mantle convection

Details The old continental shields stability related to mantle convection The old continental shields stability related to mantle convection

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15...68m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Jan. 1988, p. 68-71.

Physics

7

Earth Mantle, Planetary Evolution, Plates (Tectonics), Tectonics, Continental Drift, Convection, Olivine, Thermal Conductivity

Scientific paper

An investigation of two-dimensional thermal convection of a fluid layer overlayed by a conductive lid is presented. The results demonstrate a coupling between the zone of high thermal conductivity and the downswelling plumes. Increases in Rayleigh number, lid thickness, or thermal conductivity were shown to result in decreases in the adjustment times of the convective circulation. It is suggested that an increase of the effective thermal conductivity of the cratonic lithosphere, attributed to thermal conductivity anisotropy of olivine crystal, may cause the anchoring of downswelling mantle jets below primitive continental nuclei. Such a mechanism may explain the stability of old continental shields.

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