Alkaline Rocks and Carbonatites of the World

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Ste-Veronique

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Occurrence number: 
031-00-107
Country: 
Canada
Region: 
Quebec
Location: 
Longitude: -75, Latitude: 46.53

An approximately circular intrusion 8 km in diameter, Ste-Veronique intrudes migmatites, schists and gneisses of the Grenville Province. The complex consists of an ultramafic core of diopsidic pyroxenites of which olivine, magnetite, hornblende and phlogopite-bearing varieties occur as well as types with up to 25% orthopyroxene. There is an outward transition from pyroxenites into shonkinites which contain up to 50% augite, K-feldspar, albite, 35% biotite, sometimes hornblende and accessories. These rocks are surrounded by syenites which vary from mesocratic varieties with up to 24% clinopyroxene and 12% biotite to leucocratic varieties of 70-85% K-feldspar plus albite and a little aegirine-augite, biotite and hastingsite. Towards the margin of the complex are discontinuous areas of nepheline syenite with as much as 21% nepheline and pulaskites with 1-6% nepheline. Both rock types contain K-feldspar and albite, a little aegirine- augite, amphibole and biotite. Fenites occur at the margin of the complex and as enclaves and involve the development of alkali feldspar, aegirine-augite, biotite and blue alkali amphibole.

Age: 
K-Ar on biotite from pyroxenite and shonkinite gave 1226+-49 and 1157+-46 Ma, while biotite from nepheline syenite gave 889+- 35 Ma and nepheline 921+-37 Ma; amphibole from syenite gave 964+-39 Ma (Tabet Abdul-Malak, 1978, p. 190).
References: 
RIVE, M. 1976. Region de Sainte-Veronique. Geological Report, Quebec Ministry of Natural Resources Geological Exploration Service, 182: 1-68. TABET ABDUL-MALAK, V. 1978. Le complexe alcalin de Sainte-Veronique (Quebec, Canada): petrologie et geochimie. These, L'Universitee Claude Bernard, Lyon. 204pp
Fig. 58 Distribution of alkaline stocks in southwest Quebec. Fig. 59 Ste-Veronique (after Rive, 1976, Map 1839).
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