Seismological constraints on a possible plume root at the core-mantle boundary
Article Abstract:
Evidence is presented for an 8.5-km-thick and ~50-km-wide pocket of dense, partially molten material at the Earth's core-mantle boundary east of Australia. Array analyses of an anomalous precursor to the reflected seismic wave ScP reveal compressional and shear-wave velocity reductions of 8 and 25%, respectively, and a 10% increase in density of the partially molten aggregate.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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Tungsten isotope evidence that mantle plumes contain no contribution from the Earth's core
Article Abstract:
Two models are presented to explain osmium isotope ratios, which provide important constraints on the sources of ocean-island basalts. One of the models infers that interaction of the mantle with the Earth's outer core produces the isotope anomalies.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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Keeping score on the core
Article Abstract:
Discussion on the Earth's exchange of matter with the mantle is presented. Results of an analysis from an isotope of tungsten conclude that the Earth's core and the mantle do not interact.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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