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The Mavillette Intrusion is a small gabbroic body located in Digby County, southwestern Nova Scotia. It is dyke-like in form, trending about 150°, with a strike length of at least 1250 m and a width of about 100 m. The igneous mineralogy includes oligoclase-andesine and augite, with accessory magnetite, ilmenite, and apatite, but the intrusion has undergone variably intense alteration/low-grade metamorphism and shearing, and secondary minerals are abundant. In chemical composition the intrusion is highly evolved but probably of continental tholeiitic affinity. It differs from other mafic igneous rocks of southern Nova Scotia, but on the basis of geographic location, mineralogy, and chemistry is considered to be related to the volcanic rocks of the White Rock Formation in the Cape St. Mary's — Yarmouth area. This correlation implies a late Ordovician— early Silurian age for the intrusion.   RESUME  L'intrusion Mavillette est une petite masse gabbrolque situee dans le comte de Digby au sud-ouest de la Nouvelle-Ecosse. Elle adopte la forme d'un dyke d'une largeur d'environ 100 m et suit une direction d'aziraut 150 sur, une longueur d'au molns 1250 m. La mineralogie ignee comprend des plagioclases (oligoclase-andesine) et de l’augite, avec comme mineraux accessoires de la magnetite, de l’ilmenite et de l’apatite. Les mineraux secondaires sont tres abondants car l’intrusion a subi les effets varies d'une alteration intense et d'un metamorphisme leger, accompagnfis d'un cisalllement. La composition chimique de l’intrusion est tres developpee mais reflete probablement une affinite tholeiitique continentale. L'intrusion differe des autres roches ignees mafiques du sud de la Nouvelle-Ecosse, mais de par sa situation geographique, sa mineralogie et sa chimie, on la considere reliee aux roches volcaniques de la formation White Rock qu'on retrouve dans la region de Cape St. Mary's - Yarmouth. Cette correlation donne a l'intrusion un âge allant de l'Ordovicien tardif au debut du Silurien.  [Traduit par le journal)

Petrology of the Mavillette Intrusion Digby County, Nova Scotia