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The Livingstone Creek area is underlain by metasedimentary and metaigneous rocks of Yukon-Tanana Terrane. It is intruded by at least five distinct suites of intrusive rocks of probable Mississippian to Late Cretaceous ages, at least three of which provide timing constraints on the development of tectonic foliations. Two phases of isoclinal folding, the development of a transposition foliation and late, northeast-vergent open folds characterize the ductile deformation in the area. Brittle-ductile dextral strike-slip deformation is localized along the north-trendingd Abbadie fault zone in the eastern part of the area. Bedrock in the area has potential for lode gold, copper-gold massive sulphide and nickel (platinum-group element?) mineralization along d'Abbadie Fault.

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The layered rocks in this area originated as continental shelf sediments overlain by volcanic arc successions. Now called Yukon-Tanana terrane, they tectonically over-rode the western edge of ancient North America beginning in Middle Jurassic time. Three elements are present in the map area. The west half comprises the Big Salmon Complex; the east half is a separate, in part contemporaneous succession composed of the Dorsey Complex and Swift River Group. Unconformably overlying both these elements are less metamorphosed Klinkit Group and Triassic sediments that are here interpreted as overlap assemblages. The unexposed contact between Big Salmon Complex and Swift River Group is inferred to be an east-side-down normal fault.

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Between the Cretaceous granitic rocks (Hake Batholith on the west; Cassiar Batholith to the east) are three belts of metamorphic rocks, collectively part of Yukon-Tanana terrane. These are remnants of oceanic and continental volcanic arcs, and marginal basin sediments of Early to mid-Paleozoic age. At the head of Borden Creek are thick carbonate and andesitic volcanic rocks correlated with Klinkit Group. The Ram Creek fault and Hidden Lake fault are not exposed but deduced to be steeply dipping brittle structures with northeastward thrust or transpressional offset, based upon more complete exposure to the southeast in 105B/3 map area. The former is likely of Cretaceous age; the latter was active between mid-Permian and Early Jurassic time.

This volume contains 11 technical papers: E. Bordet - Bedrock geology of the Teslin Mtn and east Lake Laberge areas S.H. Ellis et al. - Clast fabric analysis of glacial diamict, Liard Lowlands T.A. Fraser et al. - Yukon shale studies overview M.A. Friend et al. - Bedrock geology of the Mt. Freegold district M.P. Hutchison - Devonian-Mississippian shale stata, Liard basin K.E. Kennedy - Evidence for limited glaciatin, northern Kluane Range T. Liverton and S. Casselman - Mod property, VMS mineralization M.J. Manor and S.J. Piercey - Chronostratigraphic framework, Finlayson Lake region D. Moynihan - Late Neoproterozoic limestone, Tillei and McPherson lakes A. Steiner et al. - Carlin-type gold mineralization, Nadaleen trend L.H. van Drecht and L.P. Beranek - Basal Laberge Group stratigraphy, Whitehorse trough

Geological map including isotopic age determination, fossil occurrences and mineral occurrences.

Regional bedrock mapping has revised structural and stratigraphic relationships in the northeastern corner of the Glenlyon map area (NTS 105L). Three structural panels, separated by south and southwest dipping thrust faults, subdivide the area. Cambrian (?) to Ordovician metasedimentary and volcanic rocks underlie the southwestern panel and include all exposures southwest of the Duo fault. Ordovician to Silurian (?) siliciclastic and carbonate strata and phyllite units that are intruded by Late Devonian porphyritic rocks underlie the central panel. Silurian (?) to Triassic siliciclastic and carbonate strata in the northern panel occur to the north, and in the footwall of, the Twopete fault. Mid-Cretaceous granitic rocks that crop out near Kalzas Mountain and occur below the surface near Dromedary Mountain intrude the central and northern panels. Northeast-verging folds and thrust faults deform layered rocks in the northeastern Glenlyon area and are offset by north-south oriented, steeply dipping structures with both normal and strike-slip motion. Upper Devonian Earn Group strata host layered sulphide bodies and polymetallic veins that contain lead, zinc and silver. This mineralization occurs in the footwall of the Twopete fault, a regional structure that originally developed as a Late Devonian synsedimentary fault. Ordovician and Silurian (?) quartz-rich clastic rocks are unlike coeval basinal facies rocks mapped elsewhere within the Selwyn basin in Yukon. These rocks represent slope facies deposits that mark a transition from basin to platform that is the northern extension of the McEvoy platform–Selwyn basin boundary.