Distribución de las rotaciones paleomagnéticas en la cuenca de Graus-Tremp durante el Terciario

• E. Beamud ^[1] ; M. Garcés ^[2] ; Josep A. Muñoz ^[3] ; Ll. Cabrera ^[2] ; Y. Almar ^[3]
  1. [1] Instituto de Ciencias de la Tierra Jaume Almera

     Instituto de Ciencias de la Tierra Jaume Almera

     Barcelona, España

     
  2. [2] Dpt. d’ Estratigrafía, Paleontología i Geociéncies marines, Facultat de Geología UB
  3. [3] Dpt. de Geodinámica i Geofísica, Facultat de Geología UB

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• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 4, 2004 (Ejemplar dedicado a: VI CONGRESO GEOLÓGICO DE ESPAÑA (Zaragoza, 12-15 julio, 2004)), págs. 283-286
• Idioma: español
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• Resumen

  • The Graus-Tremp piggy-back basin is an elongated trough formed during the emplacement of the allochtonous units of the South Central Pyrenean Units. Previous studies in both the Mesozoic basement and the Paleocene sediments of the Graus-Tremp basin have evidenced significant vertical axis clockwise rotations. These rock units are unconformable overlain by the syntectonic continental conglomerates of the Sierra de Sis and La Pobla de Segur, which were recently dated as Bartonian to Priabonian on the basis of magnetostratigraphic correlation. Paleomagnetic data from these units provide constraints on the timing and spatial distribution of the tectonic rotations in the Graus-Tremp Basin. No significant rotations during the Tertiary are observed near the Noguera Pal I ares a River. Further west; between the Ésera and the Noguera Ribagorçana rivers, the lower Eocene materials record up to 30- of clockwise rotation. The lack of significant rotation in the overlying Bartonian sediments of the Sierra de Sis constrains this rotation to the Ypresian-Lutetian. In the Ainsa basin, about 30- of clockwise rotation is still recorded by Bartonian sediments. These data suggest an east-west trending of the vertical axis rotations magnitude and timing.