Strong seismic reflections and melts in the mantle of a continental back-arc basin

Details Strong seismic reflections and melts in the mantle of a continental back-arc basin Strong seismic reflections and melts in the mantle of a continental back-arc basin

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106622s&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 6, CiteID L06622

Physics

19

Seismology: Lithosphere And Upper Mantle, Tectonophysics: Continental Tectonics-Extensional (0905), Tectonophysics: Dynamics Of Lithosphere And Mantle-General

Scientific paper

A program of explosion seismology in central North Island, New Zealand, discovered a strong reflector within the upper mantle. Reflections from this (PmP2) are spatially confined to come from an interface 35 km deep and directly beneath a 40 km-wide, back-arc extension zone with active volcanism, high heat flow, low Pn wave-speeds and thinned crust. On the basis of relative reflection amplitudes, the mantle reflections are most readily explained by an interface with a negative seismic impedance contrast. A satisfactory fit is obtained for a layer with a 40-90% drop in S-wave speed (Vs) compared to the surrounding mantle. We interpret this layer to be a 40 km-wide reservoir of partial melt pooled at a thermal boundary layer within the upper mantle.

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