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Yukon Geological Survey

YGS Publication Details


Reference Number
YEG2017_1
Reference Type
Yukon Geological Survey
Document Type
Annual Report Paper

Title: Bedrock geology of the Teslin Mountain and east Lake Laberge areas, south-central Yukon
Authors: Bordet, E.
NTS Mapsheet(s): 105D15, 105E02, 105E03, 105E06
Citation: Bordet, E., 2018. Bedrock geology of the Teslin Mountain and east Lake Laberge areas, south-central Yukon. In: Yukon Exploration and Geology 2017, K.E. MacFarlane (ed.), Yukon Geological Survey, p. 1-24.

Reference Location

Abstract

Mafic volcanic and clastic strata of the Middle Triassic Joe Mountain Formation, east of Lake Laberge, Yukon, represent a juvenile volcanic arc sequence. Mafic volcanic rocks of the Upper Triassic Lewes River Group were formed in the spatial and temporal continuity of Joe Mountain volcanism. Carbonate sedimentation took place in shallow oceanic subbasins adjacent to the arc from the Carnian to Rhaetian; these subbasins were separated by physiographic boundaries inherent to the arc, resulting in lateral stratigraphic variations. Polymictic conglomerate and turbiditic sequences of the Lower-Middle Jurassic Laberge Group unconformably overlie Triassic rocks. Two north-northwest strike-slip faults, the Laurier Creek and the Goddard, control the distribution of units. Joe Mountain Formation rocks are characterized by an east-west structural trend, whereas the Upper Triassic and Jurassic sequences are characterized by north-northwest trending tight folds and thrust faults. At least five post-accretion igneous suites intrude or overlie older stratigraphy, including the Late Cretaceous Open Creek volcanic complex.

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YEG2017 Contained By Yukon Geological Survey Annual Report Yukon Exploration and Geology 2017