A layered intrusion composed of diorite, pyroxenite, gabbro and anorthositic gabbro has been found in northwestern Strathy Township.
Pyrrhotite is common in associated pyroclastic rock.
Several northeast-trending shear zones less than 5 m (16 ft) wide intersect the edifice, extending along the Net Lake-Vermilion Lake Deformation Zone.
This layered intrusion might be similar in age to the Kanichee layered intrusive complex, and may represent a magma chamber that was the source of tholeiitic volcanic activity.

The Kanichee layered intrusive complex, also known as the Kanichee Intrusion and Ajax Intrusion, is the most voluminous mafic-ultramafic body in metamorphosed felsic and mafic volcanic rocks of the northern TGB.
It is an oval-shaped layered intrusion that was formed during five phases of magmatic activity.
A series of south-southeast dipping cyclic magmatic layers make up the intrusion, similar to those of the surrounding metamorphosed volcanic rocks, indicating that the rocks of the intrusion were formed horizontally and likely close to the surface.
Numerous magmatic events may have breached the surface to produce volcanic eruptions.
The overall structure of the intrusion indicates it is cylindrical in shape and has a long axis plunging to the southeast at a somewhat steep angle.
Its fairly steep angled axis was formed by at least one period of deformation that similarly folded and deformed the surrounding volcanic rocks.

An intrusion of light-coloured diorite lies at the northern end of the Tetapaga Syncline, along the Milne-Sherman Road.
Its colouration is from weathering of plagioclase, which comprises more than 50% of the intrusive rock.
Several east-trending high-strain zones related to the Link Lake Deformation Zone, less than 1 m (3.3 ft) wide, are found in the intrusion, indicating that it formed at least before the last increment of strain along the Link Lake Deformation Zone.
The dioritic intrusion might be the remains of a magma chamber that was the product of calc-alkaline feldspar-phyric felsic volcanism, the erupted products of which are mostly located in the Sherman Mine area.

At least three large granitoid intrusions penetrate the TGB.
The Spawning Lake Stock in Briggs and Chambers townships contains megacrysts that reach 2 cm (0.79 in) to 3 cm (1.2 in) in diameter.
It shears through the nearby fold axis of the Tetapaga Syncline, but remains undeformed by the western expression of the Net Lake-Vermilion Lake Deformation Zone.
To the north and northeast, the massive Chambers-Strathy Batholith was formed during one magmatic event.
It consists of intrusive rocks ranging from pink to grey quartz monzonite to granodiorite and intrudes metamorphosed volcanic rocks of the TGB.
The Iceland Lake Pluton, situated in Strathcona and Briggs townships, consists of a complex series of chlorite trondhjemite, hornblende quartz diorite and hornblende trondhjemite magmas that were emplaced during more than one magmatic event.
The trend of metamorphosed volcanic rocks in Briggs and Strathcona townships is parallel to the intrusion contact.
A planar fabric, attributed to the earliest deformation of the TGB, exists in the outer margin of the intrusion.

Intrusive dikes composed of quartz and feldspar-quartz porphyry are widespread in Strathy Township.
All dike types were placed in the Earth's crust during the formation of the TGB.
At least some of these dikes may have been subvolcanic feeders that produced known calc-alkalic felsic volcanic events in the belt.
Many pyroxenite dikes less than 2 m (6.6 ft) wide intrude every geologic formation in the township.
A pyroxenite dike east of Highway 11 extends roughly to the north-northwest while two others, north of Arsenic Lake, extend to the east.
This includes a dike exposed along the Kanichee Mine Road in Temagami North, where it intrudes the large granitic Chambers-Strathy Batholith.
A series of northwest-trending dikes composed of diabase may represent extensions of the 1,250 million year old Sudbury dike swarm.
This dike swarm is older than the Lake Wanapitei impact crater
A layered intrusion composed of diorite, pyroxenite, gabbro and anorthositic gabbro has been found in northwestern Strathy Township. Pyrrhotite is common in associated pyroclastic rock. Several northeast-trending shear zones less than 5 m (16 ft) wide intersect the edifice, extending along the Net Lake-Vermilion Lake Deformation Zone. This layered intrusion might be similar in age to the Kanichee layered intrusive complex, and may represent a magma chamber that was the source of tholeiitic volcanic activity.
The Kanichee layered intrusive complex, also known as the Kanichee Intrusion and Ajax Intrusion, is the most voluminous mafic-ultramafic body in metamorphosed felsic and mafic volcanic rocks of the northern TGB. It is an oval-shaped layered intrusion that was formed during five phases of magmatic activity. A series of south-southeast dipping cyclic magmatic layers make up the intrusion, similar to those of the surrounding metamorphosed volcanic rocks, indicating that the rocks of the intrusion were formed horizontally and likely close to the surface. Numerous magmatic events may have breached the surface to produce volcanic eruptions. The overall structure of the intrusion indicates it is cylindrical in shape and has a long axis plunging to the southeast at a somewhat steep angle. Its fairly steep angled axis was formed by at least one period of deformation that similarly folded and deformed the surrounding volcanic rocks.
An intrusion of light-coloured diorite lies at the northern end of the Tetapaga Syncline, along the Milne-Sherman Road. Its colouration is from weathering of plagioclase, which comprises more than 50% of the intrusive rock. Several east-trending high-strain zones related to the Link Lake Deformation Zone, less than 1 m (3.3 ft) wide, are found in the intrusion, indicating that it formed at least before the last increment of strain along the Link Lake Deformation Zone. The dioritic intrusion might be the remains of a magma chamber that was the product of calc-alkaline feldspar-phyric felsic volcanism, the erupted products of which are mostly located in the Sherman Mine area.
At least three large granitoid intrusions penetrate the TGB. The Spawning Lake Stock in Briggs and Chambers townships contains megacrysts that reach 2 cm (0.79 in) to 3 cm (1.2 in) in diameter. It shears through the nearby fold axis of the Tetapaga Syncline, but remains undeformed by the western expression of the Net Lake-Vermilion Lake Deformation Zone. To the north and northeast, the massive Chambers-Strathy Batholith was formed during one magmatic event. It consists of intrusive rocks ranging from pink to grey quartz monzonite to granodiorite and intrudes metamorphosed volcanic rocks of the TGB. The Iceland Lake Pluton, situated in Strathcona and Briggs townships, consists of a complex series of chlorite trondhjemite, hornblende quartz diorite and hornblende trondhjemite magmas that were emplaced during more than one magmatic event. The trend of metamorphosed volcanic rocks in Briggs and Strathcona townships is parallel to the intrusion contact. A planar fabric, attributed to the earliest deformation of the TGB, exists in the outer margin of the intrusion.
Intrusive dikes composed of quartz and feldspar-quartz porphyry are widespread in Strathy Township. All dike types were placed in the Earth's crust during the formation of the TGB. At least some of these dikes may have been subvolcanic feeders that produced known calc-alkalic felsic volcanic events in the belt. Many pyroxenite dikes less than 2 m (6.6 ft) wide intrude every geologic formation in the township. A pyroxenite dike east of Highway 11 extends roughly to the north-northwest while two others, north of Arsenic Lake, extend to the east. This includes a dike exposed along the Kanichee Mine Road in Temagami North, where it intrudes the large granitic Chambers-Strathy Batholith. A series of northwest-trending dikes composed of diabase may represent extensions of the 1,250 million year old Sudbury dike swarm. This dike swarm is older than the Lake Wanapitei impact crater
Temagami Greenstone Belt