Partial melting in the deepest mantle

Details Partial melting in the deepest mantle Partial melting in the deepest mantle

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..47s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 11, pp. 47-1, CiteID 1552, DOI 10.1029/2001GL013716

Physics

7

Seismology: Core And Mantle

Scientific paper

We have compared the travel times of direct (P, S) and core-reflected (PcP, ScS) phases recorded in southern Africa from earthquakes occurring in the Scotia Arc region. The low-velocity region beneath the south Atlantic is explored by calculating ScS-S and PcP-P travel-time residuals to determine the correlation and magnitude of Vs and Vp reductions in the deepest mantle. Residual calculations yield extraordinary results as PcP-P is about 1 second larger than expected while ScS-S is >7 seconds larger for a great circle arc distance of 54°. We investigate models of P and S velocity reductions in the deepest mantle that may explain these residuals to provide constraints on the velocity structure of the D'' region in this extremely slow zone. The reductions in P and S velocity needed to match the data are consistent with partial melting in the deepest mantle for a wide range of 1D models.

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