La ruptura intra-valesiense y el registro sedimentario de la compresión hética en las cuencas continentales portuguesas

• P. Proença Cunha ^[1] ; N.L. Pimentel ^[2] ; D. Ínsua Pereira ^[3]
  1. [1] Universidade de Coimbra

     Universidade de Coimbra

     Coimbra (Sé Nova), Portugal

     
  2. [2] Universidade de Lisboa

     Universidade de Lisboa

     Socorro, Portugal

     
  3. [3] Universidade do Minho

     Universidade do Minho

     Braga (São José de São Lázaro), Portugal

     

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• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 2, 2000 (Ejemplar dedicado a: IV Congreso del Grupo Español del Terciario (Tremp, 19-21 septiembre, 2000)), págs. 63-66
• Idioma: español
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• Resumen

  • An important Upper Miocene sedimentary break can be accurately recognised in the Portuguese basins and is reflected by a drastic palaeogeographic change in relation to a large-scale tectonic event, of probable uppermost Vallesian age (9 Ma; Upper Tortonian). The characterization of the sedimentary record of this tectonic event, as well as its relations with interpreted active faults, is made for different situations - Douro, Mondego, Lower-Tagus and Sado tertiary basins. The sedimentary record, considered upper Tortonian-Messinian ? (late Vallesian-Turolian ?) is interpreted mainly as endorheic alluvial fans (internal drainage), developed along active NNE- SSE indent-linked strike-slip faults and NE-SW reverse faults. At NE Portugal, proximal fluvial systems of an endorheic hydrographic network drained eastwards to the Spanish Duero interior Basin. The main evidences of the betic compression climax in Portugal mainland are presented; the interpreted active tectonic structures are in accordance with an intense NNW-SSE crustal shortening, but some regional differences are also documented.