Yukon Geological Survey publication metadata (English, HTML)

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Publisher-reported update

2026-08-26

The Teslin Crossing Pluton is a small (~75 km2), elliptical body which intrudes Jurassic Whitehorse Trough strata of Stikine Terrane. The pluton consists of a border phase, a lithologically and texturally complex central phase, and associated sills and dyke swarms. The border phase consists of a grey, crowded hornblende-plagioclase porphyry. The central phase consists of pink, medium to coarse grained, equigranular monzonite and syenite. Pyroxene and hornblende are essential constituents. Abundant accessory minerals include magnetite (up to 5%), titanite, apatite, rutile and zircon. Modal quartz is absent. Dykes and sills have compositions similar to the border phase. All phases contain a large amount of pea- to cobble-sized xenoliths including coarse-grained pyroxenite, coarse-grained gabbro and fine-grained diorite. The border phase also include sedimentary xenoliths. Locally there are zones of brecciation and potassic alteration. Geochemically the pluton is alkalic with 3.1-3.4% K2O, 60-68% SiO2 and minor normative quartz. Most rocks are metaluminous but more evolved phases are slightly peraluminous. The pluton is classified as a slightly silica-saturated,…

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