Alkaline Rocks and Carbonatites of the World

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Chatham-Grenville Stock

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Occurrence number: 
031-00-116
Country: 
Canada
Region: 
Quebec
Location: 
Longitude: -74.5, Latitude: 45.7

Intruded into igneous and metamorphic rocks of the Grenville Province close to the fault defining the northern margin of the Ottawa Graben, the Chatham-Grenville stock consists of two early syenites and two later granite intrusions. The first syenite comprises perthite, pale green augite and hornblende, but more quartz-rich areas of the second syenite are peralkaline with aegirine. aegirine-augite and arfvedsonite. The granites are similar.

Age: 
K-Ar on granite and syenite gave 474 and 442 Ma (Doig and Barton, 1968, Table 1).
References: 
DOIG, R. and BARTON, J.M. 1968. Ages of carbonatites and other alkaline rocks in Quebec. Canadian Journal of Earth Sciences, 5: 1401-7. HIGGINS, M.D. 1985. Geochemical evolution of the Chatham-Grenville stock, Quebec. Canadian Journal of Earth Sciences, 22: 872-80
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith