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Interaction of mantle dregs with convection: Lateral heterogeneity at the core-mantle boundary

Davies, Geoffrey F. and Gurnis, Michael (1986) Interaction of mantle dregs with convection: Lateral heterogeneity at the core-mantle boundary. Geophysical Research Letters, 13 (13). pp. 1517-1520. ISSN 0094-8276. doi:10.1029/GL013i013p01517.

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Preliminary numerical models indicate that chemically denser material (dregs) at the base of the mantle would have substantial lateral variations in thickness induced by convection of the overlying mantle, and might well form discontinuous aggregations below mantle upwellings. A model with a density contrast of about 2 per cent and an initial uniform thickness of the denser layer of 100 km yields a discontinuous distribution with maximum thickness 230 km and bottom topography of several kilometers amplitude, in reasonable accord with recent seismological observations of vertical and lateral structure. Heat flux out of the core is probably strongly modulated laterally by mantle convection, while mantle dregs will complicate and possibly amplify this effect. Such modulation may be relevant to long-term (10^7 - 10^8 year) variations in the magnetic field.

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Gurnis, Michael0000-0003-1704-597X
Additional Information:© 1986 American Geophysical Union. Received September 2, 1986; accepted September 25, 1986.
Group:Seismological Laboratory
Issue or Number:13
Record Number:CaltechAUTHORS:20130312-114937507
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37472
Deposited By: Ruth Sustaita
Deposited On:12 Mar 2013 20:15
Last Modified:09 Nov 2021 23:29

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