Oka complex, Oka, Deux-Montagnes RCM, Laurentides, Québec, Canada

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Formerly: Oka, Oka complex, Deux-Montagnes Co., Québec, Canada

Carbonatite complex. The Oka complex is an elongated oval, double-ring structure 8 km long and 2-3 km wide, trending NW-SE.
It is one of the larger intrusions (approx. age 117-120 Ma) of the Monteregian alkaline province which includes such well known intrusions as Mont Saint-Hilaire. An oval-shaped carbonatite core is enclosed by ring-dykes of ultramafic rocks. It intrudes Precambrian rocks of the Grenville structural province.
The complex was intensely explored in the 1950s and significant deposits of niobium were found. There are a number of individual localities within the complex, which were explored by a number of mining interests, but only one mine, the St. Lawrence Columbium mine, has gone into production.

References

- Gold, D.P. (1963) The relationship between the limestones and the alkaline igneous rocks of Oka and St. Hilaire, Quebec. Ph.D. Thesis, McGill University, Montreal. 354 p.
- Gold, D.P. (1967) Alkaline ultrabasic rocks in the Montreal area, Quebec. In: Ultramafic and Related Rocks, edited by P.J. Wyllie, 288-302. Robert E. Krieger Publ.Co. 464 p.
- Gold, D.P. (1969) The Oka carbonatite and alkaline complex. Guidebook GAC/MAC Annual meeting 1969, 43-62.
- Sabina, A.P. (1968), revised (1983) Rocks and Minerals for the collector. Kingston, Ontario to Lac St-Jean, Quebec. Geological Survey of Canada paper 67-51 (1968), Misc. Report No. 32 (1983), 46-49.
- Mariano, A. N., 1985. The paragenesis of the Bond Zone of the Oka Carbonatite Complex, Oka, Quebec. Senior Thesis, Bucknell Univ., Lewisburg, Pennsylvania.
- Mariano, A. N., Roeder, P. L., 1989. Wöhlerite: chemical composition, cathodoluminescence and environment of crystallization. Canadian Mineralogist, 27: 709-720.
- Villeneuve, E.M. (1990) Kimzeyite from alnoites at Ile Bizard and Oka, Quebec. Abstracts with Program GAC-MC Annual Meeting, Vancouver.
- Berger, V.I., Singer, D.A., and Orris, G.J. (2009): Carbonatites of the World. Explored Deposits of Nb and REE - Database and Grade and Tonnage Models. USGS Open-File Report 09-1139.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Aegirine Åkermanite Albite Analcime Ancylite-(Ce) Andradite var: Melanite 'Apatite' Arfvedsonite Augite Baryte Biotite Britholite-(Ce) Calcite Cancrinite Cebollite Chalcopyrite

Diopside Dolomite Fluorapatite Fluorite Forsterite Galena Grossular Haüyne Hematite Ilmenite Jarosite Kaolinite Kimzeyite Latrappite (TL) Maghemite Magnesite Magnetite

'Melilite' Microcline Monazite-(Ce) Monticellite Natrolite Nepheline 'Niobian Perovskite' Niocalite (TL) Parisite-(Ce) Periclase Perovskite Phlogopite Pyrite Pyrochlore Group var: Ceriopyrochlore (of Hogarth 1977) Pyrochlore Supergroup var: Betafite (of Hogarth 1977) 'Pyroxene Group'

'Pyroxene Group var: Al-pyroxene' Pyrrhotite Quartz Richterite Siderite 'Smectite Group' Sphalerite Strontianite Synchysite-(Ce) Thomsonite-Ca Titanite Tremolite Uranpyrochlore Vesuvianite Wairakite Wöhlerite Wollastonite

93 entries listed. 56 valid minerals. 2 type localities (valid minerals). 1 erroneous literature entry.

Localities in this Region

Canada Québec Laurentides Deux-Montagnes RCM Oka Oka complex Columbium Mining Products Bond Zone Husereau Hill (Husereau farm) Manny zone (Dufresne property) Quebec Columbium Ltd. Property St Lawrence Columbium Mine