Seismic evidence for a thermo-chemical boundary at the base of the Earth's mantle

Details Seismic evidence for a thermo-chemical boundary at the base of the Earth's mantle Seismic evidence for a thermo-chemical boundary at the base of the Earth's mantle

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.189..141w&link_type=abstract

Earth and Planetary Science Letters, Volume 189, Issue 3-4, p. 141-153.

Computer Science

45

Scientific paper

We report seismic evidence for a unique 300 km thick layer at the base of the mantle beneath the south Atlantic ocean, with a steeply dipping edge, anomalously low shear wave velocities linearly decreasing from 2% (top) to 10-12% (bottom), and a maximum P velocity decrease of 3% relative to the preliminary reference Earth model (PREM). These characteristics can be best explained by partial melt driven by a compositional change produced early in the Earth's history and a vertical thermal gradient within the layer. This boundary layer may provide an explanation for the distinctive isotope geochemical DUPAL anomaly observed at some surface ocean islands.

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