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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

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Sánchez Martínez, Sonia and Horra del Barco, Raúl de la and Arenas Martín, Ricardo and Gerdes, A. and Galán Abellán, Ana Belén and López Gómez, José and Fernández Barrenechea, José María and Arche, Alfredo (2012) U-Pb Ages of Detrital Zircons from the Permo-Triassic Series of the Iberian Ranges: A Record of Variable Provenance during Rift Propagation. The Journal of geology, 120 . pp. 135-154. ISSN 0022-1376

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Abstract

The 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 Canñizar 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.


Item Type:Article
Uncontrolled Keywords:U-Pb Ages, Permo-Triassic
Subjects:Sciences > Geology > Stratigraphic geology
ID Code:17410
Deposited On:12 Dec 2012 13:31
Last Modified:13 Dec 2012 08:50

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