Publication information

Geological Survey of Canada
Open File 8614

Geochronology of the Mount Nansen-Nisling River area, Yukon

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

© Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources, 2020

Permanent link: https://doi.org/10.4095/321802

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

Recommended citation

Joyce, N.L, Iraheta Muniz, P., Rayner, N.M., and Ryan, J.J., 2020. Geochronology of the Mount 
    Nansen-Nisling River area, Yukon; Geological Survey of Canada, Open File 8614, 1 .zip file. 
    https://doi.org/10.4095/321802

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Contents

This multicomponent Open File presents zircon U-Pb results for 12 rocks sampled from select units in the Mount Nansen-Nisling River area (Figure 1), two samples from the Stewart River area, and one sample from the Dunite Peak area, Yukon, Canada. Sample locations for the Mount Nansen-Nisling River are shown on a detailed geology map in Figure 2, whereas the three other sample locations are shown on Figure 1. 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 area, and enhance our understanding of the tectonic and metamorphic evolution of Yukon-Tanana terrane (YTT), mafic-ultramafic complexes, and the younger successor rocks built upon them in west-central Yukon. Bedrock geology of the Mount Nansen-Nisling River area consists primarily of a central domain of metamorphosed and poly-deformed Paleozoic basement intruded and overlapped by increasingly less deformed Mississippian to Cenozoic plutons and volcanic successions. More detailed information on the geology of the area can be found in Ryan et al. (2015; 2016). 
Interpretations of the U-Pb results for individual rock samples are given below in the Results section. Representative transmitted light and back-scattered electron (BSE)/ cathodoluminescence (CL) zircon images are shown for each sample, and zircon U-Pb results are illustrated in Tera-Wasserburg diagrams. The results and age interpretations for all samples are summarized in Table 1 (separate file). The full U-Pb datasets are provided as a separate Microsoft Excel file in Appendix A. Adobe PDF files containing BSE and CL images for all mounted zircon grains are presented in Appendix B. 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_8614.pdf (report)
of_8614_readme.rtf (this file)
of_8614_Table 1 Result and age interpretation summary_COMPLETE.xlsx
of_8614_Appendix A Zircon U-Pb results.xlsx
     \of_8614_Appendix B Zircon BSE and CL images (File folder containing 11 pdf files: IP813-11653.pdf, 
      IP813-11732.pdf, IP813-11733.pdf, IP813-11734.pdf, IP813-11735.pdf, IP815-11654.pdf, IP815-
     11657.pdf, IP817-11655.pdf, IP817-11656.pdf, IP817-11736.pdf, and IP824-11771.pdf)

Author contact information

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

Availability information

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

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