Mount Hunter
Currie (1976a, p. 101) reports the occurrence of trachyte at Mount Hunter, 29 km northwest of the Ice River Complex, to which it may be genetically related.
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).
Currie (1976a, p. 101) reports the occurrence of trachyte at Mount Hunter, 29 km northwest of the Ice River Complex, to which it may be genetically related.
Ice River has a U-shaped outccrop pattern concave to the north, with a separate approximately circular mass to the northeast at Mt Sharp.
Located along the eastern margin of the Similkameen batholith, of which it is a border phase, and emplaced in metasedimentary and volcanic rocks of the Permian/Triassic Kobau Formation, Kruger Mountain is itself apparently intruded by granodiorites of the batholith.
Syenite of one of the Coryell Intrusions (see 031-00-036) is cut by a 1.5 m thick dyke in the col between Record and Granite Mountains.
The Crowsnest Formation consists of a sequence of trachytic analcime-bearing agglomerates, tuffs, rare flows, and sedimentary rocks derived from them, lying conformably on mudstones and sandstones of the Lower Cretaceous Blairmore Group, and overlain disconformably by Upper Cretaceous shales of
A series of apatite and carbonate-rich veins occurs in an area of about 1x10 km extending from Nisikkatch Lake northeastwards to Lane Lake (Hogarth, 1957, Fig. 1). (Some 50 km further along the strike to the northeast lies the Thomas Lake occurrence - 031-00-008).
Fine-grained foyaite lies along the eastern margin of a granodiorite batholith, and intrudes basic volcanics along the edge of Cinder Lake. A syenitic pegmatite body occurs along the eastern shore of the Lake and contains fist-sized melanites. Further details are not available.
The intrusion does not outcrop, but boulders of carbonatite and alkaline rocks have been found on the shore of Carb Lake. A strong, approximately circular magnetic anomaly has a diameter of about 3 km (Ferguson, 1971, Map).
Two occurrences of lapis lazuli are located near Lake Harbour at the southern end of Baffin Island. They are present as conformable lenses, up to 168 m long and 8 m wide, within tightly folded synforms of marble.
Wapikopa Lake is an elliptical complex covering 98 km2, intruded into Precambrian orthogneisses. It consists of a core of pyroxene syenite with an outer zone, best developed in the southeast, of a mafic pyroxene syenite.