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Science 19 April 2002:
Vol. 296. no. 5567, pp. 513 - 516
DOI: 10.1126/science.1069404
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Reports
Superplumes from the Core-Mantle Boundary to the Lithosphere: Implications for Heat Flux
Barbara Romanowicz,*
Yuancheng Gung
Three-dimensional modeling of upper-mantle anelastic
structure reveals that thermal upwellings associated with the two
superplumes, imaged by seismic elastic tomography at the base of the
mantle, persist through the upper-mantle transition zone and are
deflected horizontally beneath the lithosphere. This explains the
unique transverse shear wave isotropy in the central Pacific. We infer that the two superplumes may play a major and stable role in supplying heat and horizontal flow to the low-viscosity asthenospheric channel, lubricating plate motions and feeding hot spots. We suggest that more
heat may be carried through the core-mantle boundary than is accounted
for by hot spot fluxes alone.
Seismological Laboratory, University of California, Berkeley, 215 McCone Hall, Berkeley, CA 94720, USA.
*
To whom correspondence should be addressed. E-mail:
barbara{at}seismo.berkeley.edu
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