NDLI: The shear-wave velocity structure of the lithosphere–asthenosphere system in the Iberian area and surroundings

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The shear-wave velocity structure of the lithosphere–asthenosphere system in the Iberian area and surroundings

Content Provider	Springer Nature Link
Author	Raykova, Reneta Blagoeva Panza, Giulia Francesco
Copyright Year	2010
Abstract	The S-wave velocity model, to the depth of 300 km for the Iberian area and surroundings, is obtained with the non-linear inversion of Rayleigh wave tomographic data in the period range from 5 to 150 s. The three-dimensional model of the region is assembled from 74 juxtaposed one-dimensional cellular structures, sized 1° × 1°, by means of a local smoothing optimisation. The S-wave velocity model shows the almost constant velocity (~4.40 km/s) in the upper mantle beneath the Iberian Massif, the well-developed low-velocity zones in the Valencia Trough and under northwest Africa, and specific features of the upper mantle layering in the zone of the Iberian range. The thickness of the crust varies between 25 and 35 km with exceptions in the zones of the Valencia Trough (11–18 km) and Pyrenees (35–45 km). Our Vs models are well correlated with the geological structure along Transmed I and evidence several features of the lithosphere–asthenosphere system in the Betic–Rif domain: quite distinct Iberian, Alboran and Meseta crustal domains; relatively thin, well-developed lithosphere under the Rif system; and clearly defined boundary between the upper and lower asthenosphere. The cellular velocity model of the Betics, where ultrapotassic lamproitic magmatism is observed, has features similar to those of other three areas in the western Mediterranean where ultrapotassic lamproitic magmatism of different age is observed. The crust and upper mantle models in these four areas can be correlated with the age of the magmatism and the local heat flow, and outline how, starting from a naturally quite undifferentiated mantle where magma genesis is currently in progress, the differentiation in lithosphere and asthenosphere can take place in time.
Starting Page	183
Ending Page	231
Page Count	49
File Format	PDF
ISSN	20374631
Journal	Rendiconti Lincei
Volume Number	21
Issue Number	3
e-ISSN	17200776
Language	English
Publisher	Springer Milan
Publisher Date	2010-03-09
Publisher Place	Milan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Iberian Peninsula Non-linear inversion Lithosphere–asthenosphere system Moho boundary Lamproites History of Science Biomedicine general Life Sciences Earth Sciences Environment
Content Type	Text
Resource Type	Article

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