Alkaline Rocks and Carbonatites of the World

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Baie-Des-Moutons (Mutton Bay)


Occurrence number: 
Longitude: -58.92, Latitude: 50.83

The Baie-des-Moutons intrusion is a ring complex predominantly of syenitic composition. However, the syenites are only marginally alkaline as indicated by the presence sometimes of green rims on pyroxenes (R.F. Martin, personal communication, 1983). Small northeast-trending carbonate-rich dykes less than 30 cm thick cut the syenites, particularly on islands off the coast. The dykes are calcitic and locally rich in biotite. They may be carbonatites or carbonate-rich lamprophyres.

K-Ar on biotite gave 566 Ma (Doig and Barton, 1968, Table 1) and 577 and 562 Ma by Rb-Sr (Lalonde and Martin, 1983, p. 66).
DOIG, R. and BARTON, J.M. 1968. Ages of carbonatites and other alkaline rocks in Quebec. Canadian Journal of Earth Sciences, 5: 1401-7. LALONDE, A.E. and MARTIN, R.F. 1983. The Baie-des-Moutons syenitic complex, La Tabatiere, Quebec. 1. Petrography and feldspar mineralogy. Canadian Mineralogist, 21: 65-79. Martin, R.F. personal communication, 1983.
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