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Title: New paleobotanical data from Carboniferous Culm deposits constrain the age of the Variscan deformation in the Eastern Pyrenees
Author: Martín-Closas, Carles
Trias, S.
Casas Tuset, Josep Maria
Keywords: Pirineus
Issue Date: Jun-2018
Publisher: (UB). (ICTJA). (IDEA). (UAB). (CSIC)
Abstract: 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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It is part of: Geologica Acta, 2018, vol. 16, num. 2, p. 107-123
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ISSN: 1695-6133
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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