Identification of an underfilled foreland basin system in the Upper Devonian of the Central Pyrenees: implications for the Hercynian orogeny |
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Authors: | Pierre?Souquet Jean-Jacques?Delvolvé Email author" target="_blank">Stéphane?BrussetEmail author |
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Institution: | (1) Laboratoire Mécanismes de Transfert en Géologie (UMR 5563 CNRS), Université Paul-Sabatier–Toulouse III, 38 rue des Trente-Six Ponts, 31062 Toulouse Cedex 04, France |
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Abstract: | A foreland basin succession has been identified in the Frasnian of the Central Pyrenees. This succession comprises a carbonate-dominated transgressive system which recorded the cratonward migration of the foreland basin subsidence, and siliciclastic depocenters which recorded the progression of the thrust-fold deformation. The foreland basin system has always been maintained in deep-marine environments, i.e., at an underfilled depositional state. It was associated with a thrust wedge which descended toward a deep-marine hinterland, i.e., with a type of orogenic wedge usually related to subduction zones. The Frasnian foreland basin system differs from the one known in the Carboniferous which evolved to overfilled depositional state and was associated with a thrust wedge rising toward a mountainous hinterland. Consequently, the Hercynian orogeny in the Pyrenees seems to result first, from a Frasnian thrusting controlled by a subduction zone located north of the Pyrenees, and second, from a Carboniferous thrusting controlled by the surrection of a frontal thrust belt in the Pyrenees. The association of underfilled foreland basin systems and hinterland-dipping thrust wedges, as exemplified in the Frasnian of the Pyrenees, can be interpreted as illustrative of the initial stages of thrust-wedge growth in deep-marine settings. |
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Keywords: | Foreland basin Foreland basin stratigraphy Tectonically controlled sedimentation Hercynian orogeny Devonian Aran valley Pyrenees France Spain |
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