Preliminary report on the Borgia meta-anorthosite (La Tuque, Québec, Canada)

摘要: A 10 km wide, subcircular body of highly recrystallized anorthosite (meta-anorthosite) located north La Tuque, Quebec, is partially surrounded by an aureole gneisses in the granulite facies. It foliated near edges, but lineated center. Pegmatites and mafic dikes were intruded into after major phase emplacement, before a later, minor deformation. Younger pegmatites post-date all The pluton appears to have been emplaced like hot diapir, possibly during Grenvillian thermostructural event. Au Nord de la un massif quasi circulaire d'une fortement recristallisee (meta-anorthosite), diambtre, est partiellement entour6 gneiss du facies granulite. bordure foliee alors que le centre posskde une lineation. Des et des dykes mafiques ont ete forces dans I'anorthosite apres majeure mise en place massif, mais avant mineure plus recente Les les jeunes sont posterieures toute Le semble avoir mis sous forme d'un diapir haute temperature, peut-atre pendant l'kvbnement dynamo-thermique grenvillien. [Traduit par journal]