Ordovician magmatism in the Eastern Pyrenees: Implications for the geodynamic evolution of northern Gondwana

Navidad, M.; Castiñeiras, Pedro; Casas, Josep Maria; Liesa, Montserrat; Белоусова, Е. А.; Proenza, Joaquín A.; Aiglsperger, Thomas

doi:10.1016/j.lithos.2018.06.019

Cited by 28 publications

(31 citation statements)

References 52 publications

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“…Simultaneously, a Late Ordovician magmatic pulse yielded a varied suite of magmatic rocks: small granitic bodies are emplaced in the pre-unconformity strata of the Canigó massif and constitute the protoliths of the Cadí, Casemí, Núria and Canigó G-1 type gneisses (ca. 457-446 Ma, Casas et al 2010;Martínez et al 2011;Navidad et al 2018), together with metre-scale thick bodies of metadiorite (ca. 453 Ma, Casas et al 2010).…”

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confidence: 99%

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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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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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confidence: 99%

“…472 Ma, Denèle et al 2009), Canigó (ca. 472-462 Ma, Cocherie et al 2005Navidad et al 2018), Roc de Frausa (ca. 477-476 Ma, Cocherie et al 2005;Castiñeiras et al 2008) and Albera (ca.…”

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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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“…CC BY 4.0 License. dated at ± 1 Ma (Navidad et al, 2018). Ɛ Nd value ranges between -5.3 and -3.1, and T DM between 1.47 and 2.72 Ga (Martínez et al, 2011;Navidad et al, 2018).…”

Section: Upper Ordovician Suitementioning

confidence: 99%

“…Rocks of the Canigó, Roc de Frausa and Albera massifs have been taken into account in this work, in which volcanic rocks of the Pierrefite and Albera massifs, and the so-called G3 orthogneisses by Guitard (1970) are also included. All subgroups vary compositionally from subalkaline andesite to rhyolite, as illustrated in the Pearce's (1996) diagram of Figure 4 (data compiled from Vilà et al, 2005;Castiñeiras et al, 2008b;Liesa et al, 2011;Navidad et al, 2018).…”

Section: Furongian-to-mid Ordovician Suitementioning

confidence: 99%

“…In the Occitan Domain (southern French Massif Central and Mouthoumet massifs) and the eastern Pyrenees, Marini (1988), Pouclet et al (2017) and Puddu et al (2019) have suggested a link to mantle thermal anomalies. Navidad et al (2018) proposed that the Pyrenean magmatism was induced by progressive crustal thinning and uplift of lithospheric mantle isoterms. In Sardinia, Oggiano et al (2010), Carmignani et al (2001), Gaggero et al (2012) and Cruciani et al (2018) have suggested that a subduction scenario, mirroring an Andean-type active margin, originated the main Mid-Ordovician magmatic activity.…”

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Comparative geochemical study on Furongian (Toledanian) and Ordovician (Sardic) felsic magmatic events in south-western Europe

Álvaro¹,

Sánchez-García²,

Puddu³

et al. 2020

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Abstract. A geochemical comparison of Early Palaeozoic felsic magmatic episodes throughout the south-western European margin of Gondwana is analysed. The comparison is made between (i) Furongian–Early Ordovician (Toledanian) activies recorded in the Central Iberian and Galicia-Trás-os-Montes Zones of the Iberian Massif, and (ii) Early–Late Ordovician (Sardic) activities in the eastern Pyrenees, Occitan Domain (Albigeois, Montagne Noire and Mouthoumet massifs) and Sardinia. Both phases are related to uplift and denudation of an inherited palaeorelief, and stratigraphically preserved as distinct angular discordances and paraconformities involving gaps of up to 30 m.y. The geochemical features of the Toledanian and Sardic, felsic-dominant activies point to a predominance of byproducts derived from the melting of metasedimentary rocks, rich in SiO2 and K2O and with peraluminous character. Zr / TiO2, Zr / Nb, Nb / Y and Zr vs. Ga / Al ratios, and REE and ƐNd values suggest the contemporaneity, for both phases, of two geochemical scenarios characterized by arc and extensional features evolving to distinct extensional and rifting conditions associated with the final outpouring of mafic tholeiitic-dominant lava flows. The Toledanian and Sardic phases are linked to neither metamorphism nor penetrative deformation; on the contrary, their unconformities are associated with foliation-free open folds subsequently affected by the Variscan deformation. The geochemical and structural framework precludes a subduction scenario reaching the crust in a magmatic arc to back-arc setting, but favours partial melting of sediments and/or granitoids in a continental lower crust triggered by the underplating of hot mafic magmas during extensional events related to the opening of the Rheic Ocean.

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Pre‐collision Magmatism

Berger

2023

The Variscan Belt of Western Europe 1

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Ordovician magmatism in the Eastern Pyrenees: Implications for the geodynamic evolution of northern Gondwana

Cited by 28 publications

References 52 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

Comparative geochemical study on Furongian (Toledanian) and Ordovician (Sardic) felsic magmatic events in south-western Europe

Pre‐collision Magmatism

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