Age dating of a bentonite in the Duo Lake Formation, western Mackenzie Mountains, Northwest Territories / K.M. Fallas and W. Matthews.: M44-2022/2E-PDF

"In the Misty Creek Embayment of the western Mackenzie Mountains, Duo Lake Formation locally includes minor volcanic deposits associated with Marmot Formation volcanism. A bentonite layer from an outcrop of graptolitic shale found in NTS map area 106-B, in the upper part of the Duo Lake Formation, was sampled for U-Pb zircon dating. Analytical results yielded a dominant population of grains with a concordia age of 439.8 ± 3.0 Ma, interpreted as the age of deposition. Minor inherited zircon populations yielded ages ranging from approximately 1200 to 2850 Ma. Observed graptolites from the same outcrop likely range from Middle Ordovician to Early Silurian and are compatible with the interpreted U-Pb age of the bentonite. Previously known Middle and Late Ordovician volcanic activity in the Misty Creek Embayment is here expanded to include Early Silurian activity, and serves as a proxy for the timing of active extensional tectonism in the basin"--Abstract, page 1.

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Publication information
Department/Agency Geological Survey of Canada, issuing body.
Title Age dating of a bentonite in the Duo Lake Formation, western Mackenzie Mountains, Northwest Territories / K.M. Fallas and W. Matthews.
Series title Current research, 1701-4387 ; 2022-2
Publication type Series - View Master Record
Language [English]
Format Electronic
Electronic document
Note(s) Includes bibliographical references (pages 12-14).
Includes abstracts in English and French.
Publishing information [Ottawa] : Geological Survey of Canada, 2022.
©2022
Author / Contributor Fallas, K. M., author.
Description 1 online resource (14 pages) : illustrations (some colour), colour map.
ISBN 9780660401195
Catalogue number
  • M44-2022/2E-PDF
Subject terms Bentonite -- Northwest Territories.
Uranium-lead dating -- Northwest Territories.
Bentonite -- Territoires du Nord-Ouest.
Datation -- Méthode uranium-plomb -- Territoires du Nord-Ouest.
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