Imaging a mantle plume beneath the French Massif Central

Details Imaging a mantle plume beneath the French Massif Central Imaging a mantle plume beneath the French Massif Central

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.136..281g&link_type=abstract

Earth and Planetary Science Letters, vol. 136, Issue 3-4, pp.281-296

Physics

69

Scientific paper

Teleseismic tomography is now widely recognised as a very powerful tool for studying the velocity structure of the lithosphere-asthenosphere system on both local and regional scales. A prime objective is to identify velocity perturbations and to constrain their location and intensity. Here we use the arrival times of P-waves from teleseismic events, recorded by a dense network of mobile and permanent stations within the French Massif Central, to derive a 3D P-velocity model for an area of 425 km × 300 km. Combined with knowledge of the basement geology of the area and the timing and geochemical characteristics of Tertiary-Quaternary volcanic activity, we consider that the velocity model provides unequivocal evidence for the ascent of a thermally and chemically anomalous mantle plume beneath the Massif Central during Tertiary times. Our model is consistent with regional Bouger gravity anomalies, documented patterns of Neogene-Recent uplift and deformation fabrics within lithosphere-derived mantle xenoliths exhumed by the volcanics.

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