La cuenca de antepaís Cantábrica, ¿un fenómeno Devónico o Carbonífero?

• Autores: M. Keller
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 1, 2, 2000 (Ejemplar dedicado a: V Congreso Geológico de España (Alicante, 10-14 julio 2000)), págs. 285-288
• Idioma: español
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• Resumen

  • In the Cantabrian Mountains of northern Spain, a strongly condensed succession of latest Famennian through earliest Namurian age is present. This succession is composed of shallow-water quartz arenites, bioclastic limestones, deep-water black and red shales, often siliceous,and nodular limestones. Mass-flow deposits and slumping are abundant in the deep-water sediments. Almost all stratigraphic contacts are erosional or reactivation surfaces, locally paleokarstare developed. The succession rests unconformably on a Silurian - Devonian shelf sequence.Towards the external parts of the Cantabrian zone, the contact is a low-angle unconformity, whereas in the central parts the contcat is paraconformable. Overlying this succession arecarbonate platform deposits and their turbiditic debris or Namurian synorogenic siliciclasticturbidites. The uppermost Devonian - basal Namurian succession is here interpreted as the initial fill of astarved foreland basin. The basal unconformity probably represents the formation of a peripheralbulge and its subsequent subaerial erosion. Migration of the bulge and the adjacent basin led toonlap of deep-water facies onto shallow-water deposits, locally onto karst surfaces, and to the deposition from gravity-driven mass flows. The change to turbiditic sedimentation during the Namurian marks the switch from the underfilled to the overfilled stage of foreland basin evolution.