Petrology and geochronology of the high-K calc-alkaline Mésanger magmatism (Armorican massif, France): a ca. 320 Ma old volcano-plutonic association - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Bulletin de la Société Géologique de France Year : 2011

Petrology and geochronology of the high-K calc-alkaline Mésanger magmatism (Armorican massif, France): a ca. 320 Ma old volcano-plutonic association

Marc Poujol
Erwan Hallot
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Olivier Bruguier
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Michel Ballevre
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Abstract

The late stages of the Variscan orogeny in western and central Europe are characterized by the emplacement of numerous Carboniferous granitic intrusions. In the southern part of the Armorican massif, volcanic and plutonic rocks occur within the Carboniferous series of the Ancenis basin. Chemical analyses indicate that they belong to the same magmatic high-K calc-alkaline association of peraluminous composition, which likely derives from crustal melting of an igneous source. A LA-ICPMS U-Pb/zircon age of 319.3 ± 3.1 Ma dates, for the first time, this magmatic event and, by there, constrains the maximum age of both the end of the sedimentation and the northward tilting of the sediments in the Ancenis basin. This magmatic event is coeval with the sedimentation of the coal-bearing Namurian basins located along the Nort-sur-Erdre fault. These intrusions are interpreted as the feeding conduits of the volcano-sedimentary layers encountered in these basins. This would imply a minimal dextral displacement of ca. 20-25 km along the Nort-sur-Erdre fault.
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insu-00656606 , version 1 (04-01-2012)

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Céline Ducassou, Marc Poujol, Erwan Hallot, Olivier Bruguier, Michel Ballevre. Petrology and geochronology of the high-K calc-alkaline Mésanger magmatism (Armorican massif, France): a ca. 320 Ma old volcano-plutonic association. Bulletin de la Société Géologique de France, 2011, 182 (6), pp.467-477. ⟨10.2113/gssgfbull.182.6.467⟩. ⟨insu-00656606⟩
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