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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/145406
New paleobotanical data from Carboniferous Culm deposits constrain the age of the Variscan deformation in the Eastern Pyrenees
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The pre-Variscan rocks of the Pyrenees exhibit a polyphase deformation linked to the Variscan crustal shortening and a low-pressure-high-temperature metamorphism. However, there is scarce chronostratigraphic evidence of this Variscan deformation in the Pyrenees. In low-grade metamorphic domains, maximum ages have been provided by the synorogenic Carboniferous Culm deposits. In medium- to high-grade metamorphic areas, the geochronological ages of the Variscan regional metamorphism or intrusive magmatic bodies constrain the age of the main Variscan deformation structures. However, these data usually provide a minimum age. Here, we present new palaeobotanical records that assign a Namurian age to the base of the Culm deposits of La Cerdanya in the eastern Pyrenees. This dating is based on the co-occurrence of the sphenopsids Archaeocalamites radiatus, Mesocalamites cistiiformis and the seed Cardiocarpus sp. The plant remains were found in sandstone facies produced by high-density turbidity flows of a deep-sea fan system. The new biostratigraphic information constrains the age of the Carboniferous Culm succession in the eastern Pyrenees.
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MARTÍN-CLOSAS, Carles, TRIAS NAVARRO, Sergio, CASAS TUSET, Josep maria. New paleobotanical data from Carboniferous Culm deposits constrain the age of the Variscan deformation in the Eastern Pyrenees. _Geologica Acta_. 2018. Vol. 16, núm. 2, pàgs. 107-123. [consulta: 24 de gener de 2026]. ISSN: 1695-6133. [Disponible a: https://hdl.handle.net/2445/145406]