Alkaline Rocks and Carbonatites of the World

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Monts Mcgerrigle Pluton

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Occurrence number: 
031-00-148
Country: 
Canada
Region: 
Quebec
Location: 
Longitude: -65.97, Latitude: 49

This large pluton of about 100 km2 consists principally of granite and a spectrum of hybrid rocks from gabbro to granite. In the northern part of the complex are dykes and small areas of nepheline syenite which have irregular, and probably gradational, contacts with the hybrid rocks.

Age: 
K-Ar determinations on four rocks range from 319-356 Ma (Romer, 1974, Table 2).
References: 
ROMER, H.S.de, 1974. Geology and age of some plutons in north-central Gaspe, Canada. Canadian Journal of Earth Sciences, 11: 570-82. WHALEN, J.B. 1985. The McGerrigle plutonic complex, Gaspe, Quebec: evidence of magma mixing and hybridization. Paper, Geological Survey of Canada, 85-1A: 795-800
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