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04/05 Séminaires Généraux : Ed Garnero (Arizona State University)

(à salle Fontanes, la Doua, du 04/05/2015 14:00 au 04/05/2015 14:00)
When May 04, 2015
from 02:00 to 02:00
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Exploring Earth's largest internal seismic anomalies: lower mantle large low shear velocity provinces

For decades seismologists have presented evidence for 2 nearly antipodal large low shear velocity provinces ("LLSVPs"). In recent years they have been characterized with sharp sides, and hence a thermochemically distinct origin has been advocated. Interesting correlations between eruption locations of hotspots and large igneous provinces with the edges of LLSVPs have been used to suggest whole mantle plumes from these deep thermochemical structures are responsible, and may carry unique isotopic signatures of the LLSVP material. While the reservoir hypothesis is attractive to explain a number of observations and predictions, an assessment of recent tomography models shows that models are not in close agreement at relatively short scales. I will present ongoing work aimed at improving tomographic coverage, especially sharpness of features and coverage in the southern hemisphere. Better characterization of mantle heterogeneity is necessary to pursue questions related to dynamics and chemistry of the interior.


Nicolas Coltice

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