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Preprints
https://doi.org/10.5194/se-2020-45
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-45
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Apr 2020

20 Apr 2020

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A revised version of this preprint was accepted for the journal SE and is expected to appear here in due course.

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

J. Javier Álvaro1, Teresa Sánchez-García2, Claudia Puddu3, Josep Maria Casas4, Alejandro Díez-Montes5, Montserrat Liesa6, and Giacomo Oggiano7 J. Javier Álvaro et al.
  • 1Instituto de Geociencias (CSIC-UCM), Dr. Severo Ochoa 7, 28040 Madrid, Spain
  • 2Instituto Geológico y Minero de España, Ríos Rosas 23, 28003 Madrid, Spain
  • 3Dpto. Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
  • 4Dpt. de Dinàmica de la Terra i de l'Oceà, Universitat de Barcelona, Martí Franquès s/n, 08028 Barcelona, Spain
  • 5Instituto Geológico y Minero de España, Plaza de la Constitución 1, 37001 Salamanca, Spain
  • 6Dept. de Mineralogia, Petrologia i Geologia aplicada, Universitat de Barcelona, Martí Franquès s/n, 08028 Barcelona, Spain
  • 7Dipartimento di Scienze della Natura e del Territorio, 07100 Sassari, Italy

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.

J. Javier Álvaro et al.

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J. Javier Álvaro et al.

J. Javier Álvaro et al.

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Short summary
A geochemical comparison of Early Palaeozoic felsic magmatic episodes throughout the south-western European margin of Gondwana is analysed and includes data from the Iberian Massif, and the eastern Pyrenees, South Franceand Sardinia. This dataset favours partial melting of sediments and/or granitoids in a continental lower crust during extensional movements related to the opening of the Rheic Ocean.
A geochemical comparison of Early Palaeozoic felsic magmatic episodes throughout the...
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