Manioc : Portail | resultats 1 - 20 pour la recherche: Cuevas, Julia

M. Roosevelt, président des Etats-Unis, et la République d'Haïti
Auteur(s) : Firmin, Anténor (1850-1911)
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Cuba por fuera (apuntes del natural)
Auteur(s) : Gallego Garcia, Tesifonte
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Relations des quatre voyages entrepris par Christophe Colomb pour la découverte du Nouveau-monde de 1492 à 1504 : suivies de diverse lettres et pièces inédites extraites des archives de la monarchie espagnole : avec deux portraits de Christophe Colomb, ses armoiries, le fac simile d'une de ses lettres autographes, et deux cartes. Tome I
Auteur(s) : Fernández de Navarrete, Martín (1765-1844) Colomb, Christophe (1450?-1506)
Auteurs secondaires : Chalumeau de Verneuil, F. T. Alphonse Dezos de La Roquette, Jean-Bernard-Marie-Alexandre (1784-1868)
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Leyendas puertorriquenas. Tomo segundo
Auteur(s) : Coll y Toste, Cayetano (1850-1930)
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Lithospheric anisotropy beneath the Pyrenees from shear wave splitting
Auteur(s) : Barruol, Guilhem Souriau, Annie Vauchez, Alain Diaz, Jordi Gallart, Josep Tubia, José Cuevas, Julia
Auteurs secondaires : Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) Géosciences Environnement Toulouse (GET) ; Institut de Recherche pour le Développement (IRD) - Université Paul Sabatier - Toulouse 3 (UPS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS) Group of Dynamics of Lithosfere, Institut of Earth Sciences “Jaume Almera” (CSIC) ; Institut of Earth Sciences “Jaume Almera” (CSIC) Departamento de Geodinamica ; Universidad del Pais Vasco

Éditeur(s) : HAL CCSD American Geophysical Union
Résumé : International audience
We investigate upper mantle anisotropy beneath the Pyrenean range along three N-S profiles across the mountain belt. The results of a first profile that operated in 1993 in the central part of the belt have been presented elsewhere. We present the results of two other profiles that ran in 1995-1996 and 1996-1997 in the eastern and western part of the belt, respectively and propose an interpretation of the whole results. Teleseismic shear waves (SKS, SKKS, and PKS) are used to determine splitting parameters: the fast polarization direction φ and the delay time δt. Teleseismic shear wave splitting in the eastern Pyrenees displays homogeneous φ values trending N100°E and δt values in the range 1.1 to 1.5 s. A station located in the southern Massif Central, 100 km north of the range, is characterized by different splitting parameters (φ = N70°E, δt = 0.7 s). In the western part of the belt, anisotropy parameters are similar across the whole belt (φ = N110°E and δt = 1.3 to 1.5 s). Most of the measured delay times, including those obtained in the central part of the range, are above the global average of the SKS splitting (around 1 s). At the belt scale, φ is generally poorly correlated with recent estimations of the absolute plate motion, which predicts a fast direction ranging between N50°E and N80°E. Instead, the orientation of φ (N100°E) is parallel to the trend of the Pyrenean belt but also to Hercynian preexisting structures. This parallelism supports an anisotropy primarily related to frozen or active lithospheric structures. We show that a signature related to the Pyrenean orogeny is likely for the stations located in the internal domains of the belt. By contrast, the anisotropy measured at the stations located on the external parts of the belt could reflect a pre-Pyrenean (Hercynian) deformation. We suggest that a late Hercynian strike-slip deformation is responsible for this frozen upper mantle anisotropy and that the Pyrenean tectonic fabric developped parallel to this preexisting fabric. Finally, no particularly strong splitting is related to the North Pyrenean Fault, commonly believed to represent the plate boundary between Iberia and Eurasia.
ISSN: 2169-9313

hal-01388841
http://hal.univ-reunion.fr/hal-01388841
http://hal.univ-reunion.fr/hal-01388841/document
http://hal.univ-reunion.fr/hal-01388841/file/Barruol_Aniso_Pyr_JGR1998.pdf
DOI : 10.1029/98JB02790

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