Cadomian volcanosedimentary complexes across the Ediacaran–Cambrian transition of the Eastern Pyrenees, southwestern Europe

Padel, Maxime; Álvaro, J. Javier; Casas, Josep Maria; Clausen, Sébastien; Poujol, Marc; Sánchez-García, Teresa

doi:10.1007/s00531-017-1559-5

Cited by 24 publications

(46 citation statements)

References 60 publications

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“…1). The pre-Variscan basement forms a large strip in the core of the cordillera and provides evidence of Cadomian, Sardic and Variscan magmatic episodes (Cocherie et al 2005;Castiñeiras et al 2008;Casas et al 2010Casas et al , 2015Navidad et al 2010;Pereira et al 2014;Martínez et al 2016;Padel et al 2018a), and Variscan and Alpine deformation events (Guitard 1970;Zwart 1979;Muñoz 1992).…”

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confidence: 90%

Deciphering the Sardic (Ordovician) and Variscan deformations in the Eastern Pyrenees, SW Europe

Puddu

Álvaro

Carrera

et al. 2019

JGS

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Detailed geological mapping of the La Cerdanya area (Canigó unit, Eastern Pyrenees) provides new data characterizing the different structural styles exhibited by Cambrian-Lower Ordovician (Jujols Group) and Upper Ordovician successions. Their unconformable contact, related to the Sardic Phase, ranges from 0° (paraconformity) to 90° (angular discordance). The Jujols Group rocks topped by the unconformity are affected by Sardic foliation-free open folds. The pre-Sardic succession, the Sardic Unconformity and the lower part of the post-Sardic succession (Rabassa Conglomerate and Cava formations) are cut and offset by several Late Ordovician NNE-SSW-trending synsedimentary extensional faults associated with hydrothermal activity, which dramatically affected the thickness of the lower part of the Upper Ordovician succession. We relate (i) the Mid-Ordovician Sardic uplift and erosion, and (ii) a Mid-Late Ordovician upward propagating extensional fault system bounding the outline of half-grabens, subsequently infilled by alluvial deposits, to a thermal doming event (about 475-450 Ma) that led to the uplift and stretching of the Ordovician lithosphere. Thermal doming may be caused by mafic magma underplating and responsible for the coeval calcalkaline magmatic activity broadly developed in the Eastern Pyrenees. We discuss the similarities between the Mid-Ordovician Sardic Unconformity and other Early Palaeozoic unconformities described in neighbouring areas. Finally, we suggest a geodynamic scenario in which a regional-scale thermal event was related to the opening of the Rheic Ocean that led to the drift of Avalonia from the SW-European margin of Gondwana. Introduction text file Click here to access/download;text file;Puddu et al rev.docx Lines 525-530: Cite references. Revision: Done Lines 539-541: Same, cites would help. Revision: Done Lines 547: Do not recommend start a paragraph by "As a result". It should be continuation of the previous because continues talking about the same.

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Deciphering the Sardic (Ordovician) and Variscan deformations in the Eastern Pyrenees, SW Europe

Puddu

Álvaro

Carrera

et al. 2019

JGS

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“…geochemical and isotopic data, have produced significant advances in the understanding of these magmatic episodes, including the importance of subduction-related Ediacaran magmatism (Castiñeiras et al 2008;Casas et al 2015;Padel et al, 2017), Ordovician magmatic events linked to the formation of the northern Gondwana passive margin (Cocherie et al 2005;Castiñeiras et al 2008;Casas et al 2010;Navidad et al 2010) and Carboniferous magmatic rocks formed during the Variscan collision (Pereira et al 2014;Denèle et al 2014;Martínez et al 2016;Van Lichtervelde et al 2017).…”

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“…In some cases, where there is a lack of fossils and of reference stratigraphic horizons, the geochronological data also enable us to assess the age of the pre-Middle Paleozoic metasedimentary sequences and correlate them along the whole margin (Padel et al 2017). This is the case for the pre-Upper Ordovician sequences of the eastern Pyrenees where Ediacaran, Ordovician and Carboniferous magmatic rocks are interbedded with or mainly intrude into an almost unfossiliferous thick (up to 5000?…”

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New late Middle to early Late Ordovician U–Pb zircon ages of extension-related felsic volcanic rocks in the Eastern Pyrenees (NE Iberia): tectonic implications

et al. 2019

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Pre-Variscan basement rocks from the Pyrenees provide evidence of several magmatic episodes with complex geodynamic histories from late Neoproterozoic to Palaeozoic times. One of the most significant episodes, consisting of several granitic and granodioritic bodies and volcanic rocks, mostly pyroclastic in nature, dates from the Late Ordovician period. In the Eastern Pyrenees, this magmatism is well represented in the Ribes de Freser and Núria areas; here, the Núria orthogneiss and the Ribes granophyre, both dated at c. 457–460 Ma, seem to form a calc-alkaline plutonic suite emplaced at different crustal levels. The presence of numerous pyroclastic deposits and lavas interbedded with Upper Ordovician (Sandbian–lower Katian, formerly Caradoc) sediments, intruded by the Ribes granophyre, suggests that this magmatic episode also generated significant volcanism. Moreover, the area hosts an important volume of rhyolitic ignimbrites and andesitic lavas affected by Alpine deformation. These volcanic rocks were previously attributed to late Variscan volcanism, extensively represented in other areas of the Pyrenees. Here we present the first five laser-ablation U–Pb zircon dates for this ignimbritic succession and two new ages for the Ribes granophyre. The ages of the ignimbrites, overlapping within error, are all 460 Ma, suggesting a genetic relationship between the plutonic and volcanic rocks and indicating that the Sandbian–Katian magmatism is much more voluminous than reported in previous studies, and possibly includes mega-eruptions linked to the formation of collapse calderas.

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“…(iii) The Puigmal unit, which consists of weakly metamorphosed (at most in the chlorite zone) metasiltstones, metapelites and schists, identified as the Cabrils to Jujols formations; it has wellpreserved stratigraphy (Padel et al, 2017;.…”

Section: Structural Datamentioning

confidence: 99%

Anatomy of an extensional shear zone leading to the exhumation of the middle crust within the Canigou dome (Eastern Pyrenees, Axial Zone)

Bayon

Cochelin

2020

Journal of Structural Geology

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Cadomian volcanosedimentary complexes across the Ediacaran–Cambrian transition of the Eastern Pyrenees, southwestern Europe

Cited by 24 publications

References 60 publications

Deciphering the Sardic (Ordovician) and Variscan deformations in the Eastern Pyrenees, SW Europe

Deciphering the Sardic (Ordovician) and Variscan deformations in the Eastern Pyrenees, SW Europe

New late Middle to early Late Ordovician U–Pb zircon ages of extension-related felsic volcanic rocks in the Eastern Pyrenees (NE Iberia): tectonic implications

Anatomy of an extensional shear zone leading to the exhumation of the middle crust within the Canigou dome (Eastern Pyrenees, Axial Zone)

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