Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Masson Street

stripes

Occurrence number: 
031-00-129
Country: 
Canada
Region: 
Montreal area
Location: 
Longitude: -73.57, Latitude: 45.55
Carbonatite: 
No

This sill outcrops in the Longue Pointe area of the City of Montreal and extends over about 2.5 km in a north-northwest- south-southeast direction with a width of some 500 m. Other sill outcrops occur within the city further to the north-northwest. About 8 m thick the sill is a tinguaite with phenocrysts of aegirine, nepheline, hauyne and orthoclase in a syenitic matrix.

Economic: 
Formerly quarried for road metal, but not now worked.
References: 

CLARK, T.H. 1952. Montreal area Laval and Lachine map-areas. Geological Report, Quebec Department of Mines, 46: 1-159.

Map: 
Fig. 1_61 Distribution of alkaline rocks in the area of Montreal.
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith