Small-scale seismic heterogeneity and mantle structure

Details Small-scale seismic heterogeneity and mantle structure Small-scale seismic heterogeneity and mantle structure

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26g....47a..20h&link_type=abstract

Astronomy & Geophysics, Volume 47, Issue 1, pp. 1.20-1.26.

Physics

Geophysics

Scientific paper

Small-scale seismic heterogeneity exists at different levels in the lower mantle and is detected by methods that analyse scattered - not direct - energy from natural and artificial sources. Its vertical distribution, association with subduction, and its <= 10 km characteristic scale length strongly suggest that the heterogeneity was originally created by melting and differentiation during mid-ocean ridge formation. With this stimulus, old ideas that the mantle is heterogeneous in structure are reinterpreted and a simple, end-member model for the heterogeneity structure is proposed. The volumetrically largest components in the model are recycled oceanic crust and mantle depleted of incompatible trace elements. About 15% of the mantle's mass is made up of recycled oceanic crust, which is associated with the observed small-scale seismic heterogeneity. Future array-based studies of the seismic structure of the mantle will provide further constraints on the provenance and size distribution of heterogeneity in the mantle.

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