Firesand River
Firesand River is an approximately circular carbonatite complex some 2.4 km in diameter giving a strong aeromagnetic anomaly.
Firesand River is an approximately circular carbonatite complex some 2.4 km in diameter giving a strong aeromagnetic anomaly.
This is an oval complex of 7x5 km, more than half of which is hidden beneath Nemegosenda Lake. It cuts Precambrian gneisses which are intruded by biotite pyroxenite and gabbro.
This small intrusion with no outcrop has a circular magnetic anomaly indicating a probable diameter of 1.5 km. Drilling indicates an ijolitic complex with syenite and carbonatite.
An elongated carbonatite-ijolite complex of 2.7x1 km, extending along and cut by a north-south-trending fault, is emplaced in massive Precambrian granites and diabase dykes. Outcrop is abundant and drilling extensive so that the complex is reasonably well defined.
Alkaline lavas and tuffs occur in the Timiskaming Group of the Abitibi Volcanic Belt, which is perhaps the largest continuous greenstone belt in the world. The Timiskaming Group comprises a sequence of conglomerates, lithic sandstones, greywackes and argillites, andesites and pyroclastic rocks.
An almost circular intrusion nearly 10 km in diameter, the Otto Stock cuts metamorphosed Archaean volcanic and sedimentary rocks, and in the south granodiorites of the Round Lake batholith.
In an area of about 1000x600 m east-northeast of Kusk Lake feldspathic sandstones and greywackes of the Mississagi Formation (Huronian Supergroup) are fenitized.
The Nemag Lake fenite occurrence covers about 800x600 m and lies 5 km northeast of the Kusk Lake occurrence (031-00-078).
Breccia bodies lying southeast of the Sudbury Basin comprise fragments of quartzite and gabbro in a finely comminuted matrix.
The French River occurrence, referred to by Currie (1976a, p. 196) as 'Bigwood-Rutter' and by Duke and Edgar (1977) as 'Bigwood', consists of two lenses of nepheline syenite within a sheath of alkaline syenite.