stripes
Occurrence number:
031-00-103
Country:
Canada
Region:
Quebec
Location:
Longitude: -77.5, Latitude: 48.25
Carbonatite:
No
Dykes of possible nephelinitic affinities occur over a wide area of Quebec approximately between Mattawa and Bachelor Lake. The dykes are up to 60 cm thick and have been described principally from drill core. They comprise olivine (29-48%) and phlogopite (9-26%) phenocrysts in a matrix of calcite (13-39%), augite (0- 6%), perovskite (1-7%), magnetite, ilmenite and analcime.
Age:
K-Ar ages on phlogopite gave 1110 Ma for a dyke near Bachelor Lake and 1520 Ma for one from the Noranda area (Currie, 1976a, p. 117).
References:
CURRIE, K.L. 1976a. The alkaline rocks of Canada. Bulletin, Geological Survey of Canada, 239: 1-228.
WATSON, K.D. 1955. Kimberlite at Bachelor Lake, Quebec. American Mineralogist, 40: 565-79.
Location: