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The timing of sinistral displacement of the Pearya Terrane along the Canadian Arctic Margin

[Die zeitliche Einordnung der sinistralen Verschiebung des Pearya-Terranes entlang des Randes der kanadischen Arktis]

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The Pearya Terrane, northern Ellesmere Island, is a composite terrane accreted to the northern margin of Laurentia. Terrane amalgamation occurred between 475 and 460 Ma and accretion occurred by 425 Ma. Mylonites exposed at Cape Columbia are interpreted as the eastern continuation of the Pearya Shear Zone. The mylonitic fabrics in orthogneiss preserve clear evidence of sinistral displacement and are cross-cut by leucocratic pegmatite dikes that give a U-Pb zircon age of 453 ± 3.5 Ma. Quartz and feldspar deformation textures coupled with the orientation of a studied dike are consistent with emplacement during late sinistral deformation. Displacement on the Pearya Shear Zone at or prior to 450 Ma records translation of the Pearya Terrane toward or along the north Laurentian margin in the early stages of the Baltica-Laurentia Caledonian collision.

German
Das Pearya-Terrane im Norden von Ellesmere Island stellt ein zusammengesetztes Terrane dar, das an den Nordrand von Laurentia angefügt wurde. Die Verschmelzung des Terranes erfolgte zwischen 475 und 460 Ma und die Akkretion um 425 Ma. Am Cape Columbia aufgeschlossene Mylonite werden als östliche Fortsetzung der Pearya-Scherzone interpretiert. Die mylonitischen Gefüge im Orthogneis haben klare Belege für sinistrale Verschiebung bewahrt. Sie werden von leukokraten Pegmatitgängen geschnitten, die ein U-Pb Zirkonalter von 453 ± 3.5 Ma ergeben. Verformungsgefüge von Quarz und Feldspat in einem untersuchten Gang sowie dessen Orientierung stimmen mit einer Platznahme während später sinistraler Deformation überein. Die Verschiebung entlang der Pearya-Scherzone um oder vor 450 Ma markiert die Translation des Pearya-Terranes in Richtung oder entlang des Nordrandes von Laurentia während der frühen Stadien der kaledonischen Baltica-Laurentia-Kollision.
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Keywords: ARCTIC TECTONICS; CALEDONIDES; PEARYA TERRANE; U-PB ZIRCON

Document Type: Research Article

Publication date: September 1, 2012

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  • Zeitschrift der Deutschen Gesellschaft für Geowissenschaften (ZDGG) is an international peer reviewed journal that accepts papers on research and applied topics in the Earth Sciences. It is published online and in print. One volume, consisting of four issues is published annually. The journal has been published by the German Geological Society since its foundation in 1848. It was relaunched in 2005.

    ZDGG invites the submission of English, German and French language papers from all fields of geology, hydrogeology, paleontology, tectonics, sedimentology, engineering geology and of course environmental geology to name a few. The editors of ZDGG also invite suggestions for thematic issues.

    Please note that ZDGG issues from Volume 170 are now available from the publisher's website at https://www.schweizerbart.de/journals/zdgg
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