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Provedor de dados:  ArchiMer
País:  France
Título:  Relations between basalts and adakitic-felsic intrusive bodies in a soft-substrate environment: the South Ouessant Visean basin in the Variscan belt, Armorican Massif, France
Autores:  Caroff, Martial
Le Gall, Bernard
Authemayou, Christine
Grosjean, Denise Bussien
Labry, Cyrill
Guillong, Marcel
Data:  2016-04
Ano:  2016
Resumo:  The metasedimentary and magmatic terranes in the southern part of the Ouessant Island (Western Brittany, France) are the offshore prolongation of the Leon Variscan metamorphic domain. They mainly consist of micaschists and subordinate amphibolitic lenses (meta-pillow lavas and volcaniclastic successions) cut by a swarm of trondhjemite sills, together with a large porphyritic monzogranite body, newly dated at 336 Ma, and later syeno-leucogranitic intrusions. A large spectrum of fluidal peperites, including spectacular "fiamme"-bearing breccias, is observable at the contact between metasediments and most of the intrusives. The coexistence of amphibolitized basalts, adakitic trondhjemites, and peraluminous granites in the inferred South Ouessant basin is assigned to a variety of deep subcontemporaneous processes, including asthenospheric partial melting, high-pressure fractionation in lithospheric reservoirs (or partial remelting of deep crystallized mafic intrusions), and continental crust melting. Implications of these new results are discussed in the Visean basinal framework of the Armorican Massif, formed at an early stage of the Variscan orogeny.
Tipo:  Text
Idioma:  Inglês

Editor:  Canadian Science Publishing
Formato:  application/pdf
Fonte:  Canadian Journal Of Earth Sciences (0008-4077) (Canadian Science Publishing), 2016-04 , Vol. 53 , N. 4 , P. 441-456
Direitos:  info:eu-repo/semantics/openAccess

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