Journal
SCIENCE
Volume 357, Issue 6351, Pages 580-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan0741
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Funding
- Natural Environment Research Council [NE/M003507/1]
- European Research Council [GA 638665]
- NERC [NE/M003507/1] Funding Source: UKRI
- Natural Environment Research Council [NE/M003507/1] Funding Source: researchfish
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Thick, rigid continents move over the weaker underlying mantle, although geophysical and geochemical constraints on the exact thickness and defining mechanism of the continental plates are widely discrepant. Xenoliths suggest a chemical continental lithosphere similar to 175 kilometers thick, whereas seismic tomography supports a much thicker root (>250 kilometers) and a gradual lithosphere-asthenosphere transition, consistent with a thermal definition. We modeled SS precursor waveforms from continental interiors and found a 7 to 9% velocity drop at depths of 130 to 190 kilometers. The discontinuity depth is well correlated with the origin depths of diamond-bearing xenoliths and corresponds to the transition from coarse to deformed xenoliths. At this depth, the xenolith-derived geotherm also intersects the carbonate-silicate solidus, suggesting that partial melt defines the plate boundaries beneath the continental interior.
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