Includes geological cross sections, mineral occurrences, isotopic age dates and fossil localities.

not_specified

Geological map (1:50,000 scale) of Tiny Island Lake map area, central Yukon (NTS 105M/16) including mineral occurrences, geological cross sections, structural relations, mesoscopic fabric data and descriptive notes on stratigraphy, intrusive rocks, structure, metamorphism and guide to mineral exploration.

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Yukon-Tanana Terrane in Little Kalzas Lake area consists of a lower quartzite package and an upper metavolcanic package. The lower quartzite package includes a discontinuous metavolcaniclastic and mafic metavolcanic unit. The upper metavolcanic package consists predominantly of intermediate to felsic metavolcanic rocks in the northern part of the map area. These rocks pass southward into a clastic-dominated metavolcanic assemblage. A conspicuous crinoidal marble occurs in the middle of the upper metavolcanic package and can be traced between the northern and southern domains. The layered metamorphic rocks are intruded by the multi-phase Little Kalzas orthogneiss complex in the northeastern part of the map area along the southwestern side of Tintina Trench. The Little Kalzas orthogneiss complex, of uncertain age, comprises granodioritic to granitic gneiss and contains abundant xenoliths of country rock. Younger (Jurassic?), post-kinematic quartz monzonite (in the north) to quartz-diorite (in the south) plutons also intrude the area. The youngest intrusive rocks are small plugs of Tertiary quartz-feldspar porphyry. A pervasive transposition foliation and mineral lineation are developed throughout the area, except in local low-strain domains where primary textures are preserved. The transposition foliation is axial-planar to tight south southwest-vergent folds whose axial surfaces become progressively upright to south southwest-dipping toward the northeast. These structures are deformed by younger crenulation cleavages and associated open folds.

Preliminary geological map (1:50,000 scale) of Grass Lakes area, Pelly Mountains, southeastern Yukon Territory (NTS 105G/7) including geological cross sections and mineral occurrences.

Preliminary geological map (1:50,000 scale) of Little Salmon Range, central Yukon (parts of NTS 105L/1, 2 and 7) including geological cross sections, mineral occurrences, fossil localities and geochronology.

not_specified

Geological map including geological cross sections, mineral occurrences and preliminary isotopic age determinations.