Geoscience Map 1994-1: Geology of the Manson Creek Map Area
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Geoscience Map 1994-1 presents the geology of the Manson Creek map-area (93N/9) in east-central British Columbia. The 1:50 000 scale geological map includes a legend, geological cross section, references, and a table of mineral occurrences.
The area is cut by a series of major northwest trending faults that juxtapose disparate crustal levels. The oldest package exposed, the Upper Proterozoic Ingenika Group contains five formations. The Swannell Formation has four units: quartz-feldspathic paragneiss, amphibolite gneiss, calcsilicate gneiss, and marble cut by abundant granite and granite pegmatite bodies; mainly quartzofeldspathic paragneiss and schist, also cut by abundant granite and granite pegmatite bodies; quartz-feldspathic paragneiss, quartz-feldspar mica schist, micaceous metaquartzite, and calcsilicate and amphibolite gneiss; and micaceous metaquartzite, quartz-mica schist and metaquarztite. The Tsaydiz Formation consists mainly of slate, phyllite, and thinly bedded limestone to argillaceous limestone. The Espee Formation is dominantly limestone; and the Stelkuz Formation is slate, siltstone, sandstone and impure quartzite. The Paleozoic (?) and Proterozoic Boulder Creek Group consist of phyllite, slate, siltstone, schist, sandstone, and limestone or marble. The Upper (?) Devonian to Permian Big Creek Group has a lower unit dominated by shale and argillite, and an upper unit that is mainly argillite. Mississippian to Permian rocks include the Manson Lakes Ultramafics, which are mainly serpentinite with local schistose zones containing talc or mariposite, and the Mount Howell Succession of the Nina Creek Group. The Mount Howell Succession has sill-like gabbro bodies, and an argillite, siliceous argillite, chert, basalt, wackes, limestone and tuff unit. The Pillow Ridge Succession of the Nina Creek Group is of Pennsylvanian to Permian age. It consists of massive and pillowed basalt, chert, siliceous argillite and gabbro. Middle to Upper Triassic strata of the Nicola Group in the area include the Slate Creek and Plughat Mountain successions. The Slate Creek contains a unit dominated by massive and pillowed basalt, and a unit with argillite, slate, calcareous argillite, and siliceous argillite. The Plughat Mountain Succession consists mainly of tuff and agglomerate with a small epiclastic component.
The oldest intrusive rocks in the area are Devonian to Mississippian carbonatites, mainly biotite sovite, as well as foliated syenite and monzonite. The Upper Paleozoic or younger Wolf Ridge gabbro is also foliated. The Cretaceous Germansen batholith consists mainly of biotite-muscovite granite to granodiorite. It is megacrystic and has associated garnet-bearing pegmatites and aplite dikes. The Cretaceous or younger Wolverine Range intrusions comprise garnet-muscovite-biotite granodiorite to granite and related pegmatite. Tertiary intrusions are subvolcanic feldspar phyric andesite associated with monzonite to quartz monzonite dikes and irregular bodies.
The metamorphic rocks of the Wolverine metamorphic complex record several periods of deformation. Paleozoic and Triassic strata tend to be steeply inclined or within upright folds. Major northwest to northerly trending faults dominate the structural fabric of the area. Movement has been both strike slip and vertical.
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