Abstract: The oldest rocks in Wolverine Creek map area belong to a Devono-Mississippian metamorphic assemblage consisting of heterogeneous quartzite and orthogneiss. The quartzite unit is commonly micaceous, and includes interlayered metapelite, metacarbonate, and amphibolite interpreted as metamorphosed mafic igneous rock. The orthogneiss is dominated by leucocratic, medium to coarse-grained metaplutonic rock, and mesocratic to melanocratic, fine to medium grained metaplutonic and probably metavolcanic rock. Fabrics in the metamorphic assemblage indicate two pre-Early Jurassic tectonic events, the youngest of which involved top-to-the-north shearing. Regional amphibolite grade metamorphism led to the development of migmatite in the metapelite and orthogneiss, and recrystallized hornblende in the orthogneiss.

The metamorphic rocks are crosscut by post-tectonic intrusions including:: quartzo-feldspathic pegmatite, spinel peridotite, and alkalic syenite of Early Jurassic Minto Plutonic Suite; and quartz monzonite of Middle Cretaceous Dawson Range Batholith. These metamorphic and plutonic rocks are nonconformably overlain by a thick (about 700 m) succession of mafic lava flows, and tuffs of Upper Cretaceous Carmacks Group. Monzo-syenite plutons and a rhyolite plug are regarded as cogenetic, epizonal equivalents of Carmacks Group. Major faults, including Big Creek Fault, Wolverine Creek Lineament, and probably Hoochekoo Fault, were active during Carmacks Group volcanism. Porphyry, vein and skarn mineralization are associated with each of the post-tectonic magmatic events.

Authors: Johnston, S.T. and Hachey, N.

Map Scale: 1 : 0

NTS Mapsheet(s): 115I12

Citation: Johnston, S.T. and Hachey, N. , 1993. Preliminary results of 1:50 000-scale geologic mapping in Wolverine Creek map area (115 I/12), Dawson Range, southwest Yukon. In: Yukon Exploration and Geology 1992, Yukon Exploration of Geology , Indian & Northern Affairs Canada/Department of Indian & Northern Development: Exploration & Geological Services Division, 49-60.

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