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Two billion years old relicts in the Hercynian belt of Western Europe

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Summary

Icart orthogneisses (Guernsey, Channel Islands) present, in spite of their petrographic homogeneity, Rb-Sr whole rock data strongly scattered between two reference isochrons at 2.55 and 1.91 b.y. We present a U-Pb zircon age of 2018±15m.y. (upper intersection on Concordia) which is probably close to the emplacement age of the whole massif. This age is so far the oldest obtained from a rock of igneous origin in the Hercynian belt of Western Europe.

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Author notes

  1. J. Y. Calvez

    Present address: Lab. für Geochronologie Universität Heidelberg, Germany

  2. Ph. Vidal

    Present address: Department of Geological Sciences, 93106, Santa Barbara, California, USA

Authors and Affiliations

  1. Centre Armoricain d'Etude Structurale des Socles, B.P. 25A, F-35031, Rennes Cedex, France

    J. Y. Calvez & Ph. Vidal

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  1. J. Y. Calvez
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  2. Ph. Vidal
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Calvez, J.Y., Vidal, P. Two billion years old relicts in the Hercynian belt of Western Europe. Contr. Mineral. and Petrol. 65, 395–399 (1978). https://doi.org/10.1007/BF00372286

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  • DOI: https://doi.org/10.1007/BF00372286

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