Red Wine is a regionally metamorphosed agpaitic complex situated within the Grenville Front tectonic zone of central Labrador.
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Canadian occurrences of alkaline rocks have previously been listed and described in some detail in the monograph by Currie (1976a), although a significant number that have come to light since that publication will be found here. These new localities notably include extensive areas of peralkaline granites in Newfoundland, and of alkaline volcanics and intrusives in British Columbia, and it seems likely that many future discoveries will be concentrated in the latter area.
Many of the more northerly carbonatite occurrences are only poorly known and have not been dated. Although generally badly exposed, many have been drilled but rarely have findings been published. Many Canadian occurrences have been investigated for their economic potential (see, for instance, Ferguson, 1971) and important mining operations for nepheline syenite at Blue Mountain and Nb at St-Honore are taking place, with active exploration and appraisal for phosphate and vermiculite elsewhere. A number of occurrences in Ontario is described by Parsons (1961) and nearly 30 Ontario carbonatites have recently been re-investigated by R.P. Sage, although his internal reports were not available when the present accounts were compiled. K-Ar ages on numerous carbonatites in eastern Canada are given by Gittins et al.(1967) and of a broader range of alkaline rocks by Doig and Barton (1968). Rb-Sr ages and Sr isotopic ratios for many Ontario occurrences have been published by Bell et al. (1982).
An oval body of about 8x4 km, Bigspruce Lake is emplaced in Precambrian equigranular and porphyritic biotite granites. Almost all of the complex is now covered by the waters of Bigspruce Lake because of a power dam built on the Snare River.
The Marron Formation is a sequence of early Tertiary lavas associated with which are a number of intrusions, referred to as the Coryell Intrusions, which are thought to be consanguineous. Both lavas and intrusions probably extend beyond the area indicated by the map (Fig.
Numerous monchiquitic dykes occur along the coast and on islands in the southern part of Notre Dame Bay (Strong and Harris, 1974, Fig. 1). Titanaugite, biotite and olivine form phenocrysts and analcime is present in the groundmass and, with calcite, in ocelli.
In the vicinity of Hare Hill, and Talk's Pond lying to the south, peralkaline granites, syenites and aplites with arfvedsonite and aegirine have been identified. Alkaline amphiboles are commonly replaced by biotite, sometimes with a little riebeckite.
The central part of the Mount Champlain pluton is a leucocratic arfvedsonite granite; fayalite-bearing syenites also occur. Elpidite is present in miarolitic cavities.
In the vicinity of Cape Aillik and Cape Makkovik on the Labrador coast and on offshore islands occur numerous gently dipping dykes (? cone sheets) possibly related to a centre beneath Aillik Bay.
The Baie-des-Moutons intrusion is a ring complex predominantly of syenitic composition. However, the syenites are only marginally alkaline as indicated by the presence sometimes of green rims on pyroxenes (R.F. Martin, personal communication, 1983).
This is an area of granodiorite, granite and syenite overlain by an extensive sequence of ash-flow tuffs. Some facies of the granites and syenites contain abundant riebeckite which Mercer et al. (1985) consider to be metasomatic, but K.L. Currie (personal communication, 1985) feels is not.
The La Scie intrusive complex comprises the Reddits Cove gabbro, the La Scie granite and the Seal Island Bight syenite, only the last being peralkaline.