Local variability in the 410-km mantle discontinuity under a hotspot

Details Local variability in the 410-km mantle discontinuity under a hotspot Local variability in the 410-km mantle discontinuity under a hotspot

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009e%26psl.288..158l&link_type=abstract

Earth and Planetary Science Letters, Volume 288, Issue 1-2, p. 158-163.

Computer Science

2

Scientific paper

Observations of the natural variability in the structure of seismic discontinuities in the Earth's mantle can be used to infer spatial variations in temperature and composition. Here I present a high-resolution analysis of converted seismic waves from the olivine-wadsleyite phase transition beneath Rarotonga, Cook Islands. New advances in seismic signal processing permit the determination of local variations in phase transition thickness in addition to variations in absolute depth. I find that the depth and thickness of the phase transition vary systematically underneath the island, and further that temperature alone is insufficient to explain these observations. A chemical anomaly is required, consistent with the presence of a plume in the mantle.

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