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Unravelling the thermal evolution of the Neruokpuk Formation in the British Mountains, North Yukon, Canada: Tectonic and orogenic implications

By
Maelianna Bigot-Buschendorf
Maelianna Bigot-Buschendorf
Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP UMR 7193, F-75005 Paris, France
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Frédéric Mouthereau
Frédéric Mouthereau
Geoscience Environnement Toulouse (GET), Université de Toulouse, UPS, Université Paul Sabatier, CNRS, IRD, 14 av. Edouard Belin, F-31400 Toulouse, France
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Loïc Labrousse
Loïc Labrousse
Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP UMR 7193, F-75005 Paris, France
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Charlotte Fillon
Charlotte Fillon
Geoscience Environnement Toulouse (GET), Université de Toulouse, UPS, Université Paul Sabatier, CNRS, IRD, 14 av. Edouard Belin, F-31400 Toulouse, France
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Konstanze Stübner
Konstanze Stübner
Universität Tübingen, Department of Geosciences, Wilhelmstraße 56, 72076 Tübingen, Germany
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Matthias Bernet
Matthias Bernet
ISTerre, CNRS, Université Grenoble I, BP 53, 1381 rue de la Piscine, F-38041 Grenoble, France
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Publication history
30 April 201817 January 2019

ABSTRACT

Defining temporal and spatial distribution of shortening is critical to reconstruct past plate motions and to examine mechanical coupling processes at convergent plate boundaries. Understanding the collisional evolution of the British Mountains and Beaufort-MacKenzie basin in the northern Alaska–Yukon region is key for the geodynamics of the Arctic region. With the aim to resolve the exhumation history of this region, we present the first zircon fission-track and (U-Th)/He analyses on apatite and zircon from the Neruokpuk Formation (ca. 720–485 Ma), which forms the orogenic basement of the British Mountains. Zircon fission-track ages show partial resetting, indicating the Proterozoic basement did not reside at temperatures above 240 °C. Thermal modeling of zircon and apatite (U-Th)/He data indicates that our samples reached this maximum temperature at ca. 100 Ma. The onset of the Brookian collision is indicated by exhumation from ca. 80 Ma. A total exhumation of 7–8.5 km since the Late Cretaceous is inferred. Apatite (U-Th)/He ages of ca. 50 Ma show that exhumation was less than 2.5 km since the early Eocene. We infer from a comparison with the temporal evolution of exhumation from adjacent orogenic domains that shortening progressively shifted northward from the British Mountains to the Barn Mountains and offshore in the Beaufort Sea during the Paleocene. Along-strike variations in the architecture of the rifted margin of Arctic Alaska is suggested to have exerted a strong control on the structural styles and observed exhumation patterns.

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Contents

Circum-Arctic Structural Events: Tectonic Evolution of the Arctic Margins and Trans-Arctic Links with Adjacent Orogens

Geological Society of America
Volume
541
ISBN electronic:
9780813795416

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