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Zircon geochronology and geochemistry of the Ward Hunt pluton, Pearya terrane, Canadian High Arctic: Insights into its age, origin, and circum-Arctic Timanide connections

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Abstract

The northern margin of the Neoproterozoic Timanide Orogen is truncated by Paleozoic deformation of the Caledonian Orogen. Evidence for dispersion of terranes affected by the Timanide Orogen is documented through contemporaneous tectonothermal activity, and by detrital zircon in sedimentary rock from across the Arctic Ocean margins. However, directly tying these terranes to the Caledonide realm is hindered by the paucity of appropriate events in proximal terranes. The Ward Hunt Pluton, a previously undated syenite–monzodiorite intrusion located on Ward Hunt Island, northern Pearya terrane, yields a crystallization age of 542 ± 2 Ma. Trace-element data from the igneous zircon suggest that the pluton intruded older metasedimentary rocks of the terrane as part of a volcanic arc system, indicated by juvenile Hf isotopic signatures and trace-element data. The data support links between the Pearya terrane and other Neoproterozoic–Cambrian arc systems, such as those proposed in Arctic Alaska-Chukota and the Alexander terrane.

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Acknowledgements

Financial support for this study was provided by National Science Foundation Grants EAR-0948359 and EAR-1049368 to McClelland, and EAR 1032156 to the University of Arizona Laserchron Center, Grants from ExxonMobil, and the University of Iowa Department of Earth and Environmental Science to Malone, and funds from Shell Inc. to McClelland. Fieldwork was supported by the Bundesanstalt für Geowissenschaften und Rohstoffe (BGR- German Federal Institute for Geosciences and Natural Resources). Helpful review by O. Anfinson and J. Majka improved the manuscript.

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  1. Department of Natural & Applied Sciences, University of Wisconsin Green Bay, Green Bay, WI, 54311, USA

    Shawn J. Malone

  2. Department of Earth and Environmental Sciences, University of Iowa, Iowa City, IA, 52242, USA

    William C. McClelland

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Malone, S.J., McClelland, W.C. Zircon geochronology and geochemistry of the Ward Hunt pluton, Pearya terrane, Canadian High Arctic: Insights into its age, origin, and circum-Arctic Timanide connections. Arktos 6, 93–105 (2020). https://doi.org/10.1007/s41063-020-00078-9

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