Publication information

Geological Survey of Canada
Open File 8615

Geochronology of the Klaza River area, Yukon 

N.L. Joyce, P. Iraheta Muniz, D.A. Kellett, N.M. Rayner, and J.J. Ryan

© Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources, 2022

Permanent link: https://doi.org/10.4095/321893

Publications in this series have not been edited; they are released as submitted by the author.

Recommended citation

Joyce, N.L., Iraheta Muniz, P., Kellett, D.A., Rayner, N.M., and Ryan J.J., 2022. Geochronology of the Klaza area, Yukon; Geological Survey of Canada, Open File 8615, 1 .zip file. https://doi.org/10.4095/321893

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Contents

This multicomponent Open File presents zircon U-Pb results for 12 rock samples and hornblende, muscovite and biotite 40Ar/39Ar results for 16 rock samples from select units in west central Yukon, Canada (Figure 1). Most samples come from the Klaza River area, as well as a few samples from along the Yukon River (16RAYJR140A01, 16RAY-JR140D01) and Ladue River (16RAY-JR174A02, 16RAY-JR176A01, 16RAY-JR178A01, 16RAY-JR182A01) to the northwest of the Klaza area (Figures 1 and 2). This analytical work was conducted as part of the Crustal Blocks activity of the Geomapping for Energy and Minerals (GEM) Cordillera Project of the Geological Survey of Canada, in large part to support the geological mapping in the Klaza River area, and enhance our understanding of age, and tectonic and metamorphic evolution of Yukon-Tanana terrane (YTT), and the younger successor rocks built upon it in west-central Yukon. Bedrock geology of the Klaza River area consists primarily of a central domain of metamorphosed and poly-deformed Paleozoic basement intruded and overlapped by relatively little-deformed Mesozoic and Cenozoic successions. More detailed information on the geology of the area can be found in Ryan et al. (2018). The Klaza River mapping and geochronology compliments the neighbouring study in the Mount Nansen-Nisling River area (Ryan et al., 2016 and Joyce et al., 2019).
Interpretations of the U-Pb and 40Ar/39Ar results for individual rock samples are detailed in the Results section. Representative transmitted light and back-scattered electron (BSE)/ cathodoluminescence (CL) images are shown for each zircon sample. U-Pb detrital zircon results are illustrated by Concordia and combined histogram/probability density diagrams, whereas U-Pb igneous/metamorphic zircon results are solely illustrated by Concordia diagrams. 40Ar/39Ar hornblende, muscovite and biotite are presented in step heat spectrum plots, and inverse isochron diagrams where appropriate. The results and age interpretations for all samples presented are summarized in Table 1 (separate file). The full U-Pb and 40Ar/39Ar datasets are provided as separate Microsoft Excel files in Appendices A and B, respectively. Adobe PDF files for each U-Pb zircon sample containing BSE and CL images for all mounted zircon grains are also presented in Appendix C. Grains are numbered and correspond to analysis spot names; the locations of SHRIMP (sensitive high resolution ion microprobe) analytical spots are depicted by ellipses. 

Directory structure

of_8615_readme (this file)
of_8615.pdf (report)
of_8615_Table 1 Result and age interpretation summary.xlsx
of_8615_Appendix A Zircon U-Pb results.xlsx
of_8615_Appendix B ArAr results.xls
\of_8615_Appendix C Zircon BSE and CL images 
(File folder containing 9 pdf files: IP844-11875.pdf, IP844-11876.pdf, IP844-11877.pdf, IP844-11886.pdf, IP859-11881.pdf, IP859-11884.pdf, IP871-11878.pdf, IP906-12302.pdf, IP908-12304.pdf, IP908-12305.pdf)

Author contact information

N.L. Joyce (nancy.joyce@nrcan-rncan.gc.ca)
Geological Survey of Canada
601 Booth Street
Ottawa, Ontario
K1A 0E8

P. Iraheta Muniz
McIntosh Perry Consulting Engineers Ltd., 
115 Walgreen Road, 
Carp, Ontario

D.A. Kellett (dawn.kellett@nrcan-rncan.gc.ca)
Geological Survey of Canada
1 Challenger Drive
P.O. Box 1006
Dartmouth, Nova Scotia
B2Y 4A2

N.M. Rayner (nicole.rayner@nrcan-rncan.gc.ca)
Geological Survey of Canada
601 Booth Street
Ottawa, Ontario
K1A 0E8

J.J. Ryan (jim.ryan@nrcan-rncan.gc.ca)
Geological Survey of Canada
1500-605 Robson Street
Vancouver, British Columbia
V6B 5J3

Availability information

This publication is available for free download through GEOSCAN (https://geoscan.nrcan.gc.ca/).

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