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

✍ Scribed by J. Y. Calvez; Ph. Vidal

• Publisher: Springer
• Year: 1978
• Tongue: English
• Weight: 474 KB
• Volume: 65
• Category: Article
• ISSN: 0010-7999
• DOI: 10.1007/bf00372286

✦ Synopsis

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 _+15 m.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.