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Seismic Evidence for Partial Melt at the Base of Earth's Mantle
Abstract
The presence of an intermittent layer at the base of Earth's mantle with a maximum thickness near 40 kilometers and a compressional wave velocity depressed by ∼10 percent compared with that of the overlying mantle is most simply explained as the result of partial melt at this depth. Both the sharp upper boundary of this layer (<10 kilometers wide) and the apparent correlation with deep mantle upwelling are consistent with the presence of liquid in the lowermost mantle, implying that the bottom of the thermal boundary layer at the base of the mantle may lie above its eutectic temperature. Such a partially molten zone would be expected to have enhanced thermal and chemical transport properties and may provide constraints on the geotherm and lateral variations in lowermost mantle temperature or mineralogy.
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Cited by
Global tomographic images of mantle plumes and subducting slabs: insight into deep Earth dynamics
Zhao, D. (2004) · Physics of the Earth and Planetary Interiors · doi:10.1016/j.pepi.2003.07.032 · Cited by 687
Seismic Detection of the Lunar Core
Weber, R. C., Lin, P.-Y., Garnero, E. J., Williams, Q., & Lognonné, P. (2011) · Science · doi:10.1126/science.1199375 · Cited by 579
Self-citationTo What Extent Does Terrestrial Life “Follow The Water”?
Jones, E. G., & Lineweaver, C. H. (2010) · Astrobiology · doi:10.1089/ast.2009.0428 · Cited by 66
Metadata
- Authors
- Williams, Q., & Garnero, E. J.
- Venue
- Science
- Published
- 1996-09-13
- Volume
- 273
- Issue
- 5281
- Pages
- 1528-1530
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2075877487
- Cited by
- 596
- References
- 0
- FWCI
- 21.61
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Seismic Evidence for Partial Melt at the Base of Earth's Mantle. https://app.cochat.ai/papers/10.1126/science.273.5281.1528
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- Williams, Q., & Garnero, E. J. (1996). Seismic Evidence for Partial Melt at the Base of Earth's Mantle. Science. https://doi.org/10.1126/science.273.5281.1528
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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