Geochronology and geochemistry of Ordovician felsic volcanism in the Southern Armorican Massif (Variscan belt, France): Implications for the breakup of Gondwana
Low-grade, porphyritic felsic metavolcanics make up a significant volume of the South Armorican domain (Variscan belt, France). Their age and geochemistry are the first focus of this paper. These rocks have long been considered to be Silurian in age because they are either thrust over Silurian sediments (the so-called "Porphyroid Nappe") or inserted within the Silurian sediments, acting as a decollement level (Para-autochthon), and because of a previous zircon age. Five new U-Pb SHRIMP zircon...[Show more]
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