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Mont Mégantic, Le Granit RCM, Estrie, Québec, Canada

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Mont Mégantic is the easternmost and largest member of the Monteregian Hills alkaline intrusions. It is approx. 8 km in diameter (~54 km²) and rises to about 1110 m high. The core of the intrusion is granite diorite with arcuate intrusions on the North side of gabbro and outside of it pealkaline syenite. The age is 134±8 Ma.

Mineral List

21 entries listed. 16 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


BÉDARD, J.H.J., LUDDEN, J.N., and Francis, D.M. 1987. The Mégantic intrusive complex, Québec: a study of the derivation of silica-oversaturated anorogenic magmas of alkaline affinity. Journal of Petrology, 28: 355–388.

CLÉMENT, P., & DE KIMPE, C.R. 1977. Geomorphological conditions of gabbro weathering at Mount Mégantic, Quebec. Canadian Journal of Earth Sciences, 14: 2262–2273

CURRIE, K.L. (1970) An hypothesis on the origin of alkaline rocks suggested by the tectonic setting of the Monteregian Hills. Canadian Mineralogist, 10, 411-420.

CURRIE, K.L.(1976) The Alkaline Rocks of Canada. Geological Survey of Canada Bulletin 239.

EBY, G.N. (1985) Monteregian Hills II: Petrography, major and trace element geochemistry, and strontium isotopic chemistry of the eastern intrusions: Mounts Shefford, Brome and Megantic. Journal of petrology 26, 418-448.

FEININGER, T., & GOODACRE, A.K. (2003) The distribution of igneous rocks beneath Mont Mégantic (the easternmost Monteregian) as revealed
by gravity. Canadian Journal of Earth Sciences, 32: 1350–1364.

MCGERRIGLE, H.W. 1935. Mount Mégantic area, southeastern Québec, and its placer gold deposits. In Annual report of the Quebec Bureau of Mines for the calendar year 1934, Part D. Quebec Bureau of Mines, pp. 63–104.

REID, A.M. 1976. Géologie du Mont Mégantic. Ministère des Richesses naturelles du Québec, Étude Spéciale 25.

SEGUIN, M.K. & ST-HILAIRE, B. (1985) Magnetochronologie des formation rocheusesdu Mont Mégantic et des environ, Québec meridionel. Canadian Journal of Earth Sciences 22, 487-497.

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