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U-Pb ages of detrital zircons from the Permo-Triassic series of the Iberian Ranges: A record of variable provenance during rift propagation

AutorSánchez Martínez, S.; Horra, Raúl de la ; Arenas, Ricardo ; Gerdes, A.; Galán, A. B. ; López-Gómez, José ; Barrenechea, J. F. ; Arche, Alfredo
Palabras claveeolian deposit
fluvial deposit
Hercynian orogeny
lacustrine deposit
Permian-Triassic boundary
rift zone
sedimentary basin
uranium-lead dating
Iberian Cordillera
Fecha de publicaciónmar-2012
EditorUniversity of Chicago Press
CitaciónJournal of Geology, 2012, 120(2), March : 135-154
ResumenThe provenance of the Permo-Triassic series of the Talayuelas anticline (Iberian Ranges) have been studied using UPb geochronology (laser ablation inductively coupled plasma mass spectrometry) of detrital zircons. These intracontinental siliciclastic series were formed by extensive sandy braided fluvial systems associated with ephemeral lake deposits and aeolian sediments, with paleocurrents suggesting constant NW-SE transport directions. Upper Permian reddish sandstones from the Upper Alcotas Formation (Lopingian) contain a dominant Variscan zircon population (290-360 Ma), which indicates source areas located in the axial zone of the Variscan belt, in the core of the Ibero-Armorican arc. However, in the Lower Triassic sandstones of the Can ̃izar Formation (Olenekian), the Variscan zircon population is almost completely replaced by Cadomian zircons (520-750 Ma), with important Avalonian (390-520 Ma), Mesoproterozoic (900-1750 Ma), Eburnian (1.78-2.35 Ga), and post-Eburnian and Archaean (>12.4 Ga) zircon populations. This detrital zircon content now suggests source areas located more to the NW, in the Avalonian microcontinent, although a limited supply coming from the southern part of Laurentia cannot be ruled out. Finally, in the Middle Triassic (Anisian), the source areas returned to the Variscan axial zone, since the Variscan zircon population is again highly dominant during this period. The changes detected in the source areas of the Permo-Triassic series are related to the development and propagation of the Iberian rift, one of the large extensional structures that determined the generation of the sedimentary basins and finally caused the breakup of Pangea. The methodology followed in this article is very useful to understand the generation and evolution of these intracontinental basins and also the relationships between the different rift systems generated in the North Atlantic realm during the Permo-Triassic times.
Versión del editorhttp://dx.doi.org/10.1086/663983
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