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Integrated crustal–geological cross-section of Ellesmere Island

By
R. Stephenson
R. Stephenson
School of Geosciences, Geology and Petroleum Geology, Meston Building, King’s College, University of Aberdeen, Aberdeen AB24 3UE, UK
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K. Piepjohn
K. Piepjohn
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), 30655 Hanover, Germany
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C. Schiffer
C. Schiffer
Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
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W. Von Gosen
W. Von Gosen
Geozentrum Nordbayern, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
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G. N. Oakey
G. N. Oakey
Geological Survey of Canada Atlantic, Halifax, Nova Scotia, Canada
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G. Anudu
G. Anudu
School of Geosciences, Geology and Petroleum Geology, Meston Building, King’s College, University of Aberdeen, Aberdeen AB24 3UE, UK
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Published:
January 01, 2018

Abstract

The crustal seismic velocity model (based on receiver functions) of Ellesmere Island and the structural geological cross-section of Ellesmere Island, both documented and discussed elsewhere in this volume, are here integrated into a crustal-scale transect crossing all the main tectonic domains. The velocity model satisfies much of the observed gravity field, but implies minor modifications with potentially important implications for characterizing the lower crust over the transect. The crust of the Pearya Terrane includes a high-velocity and high-density lower crustal body, suggested to represent a mafic underplate linked to the emplacement of the High Arctic Large Igneous Province. A similar body also lies directly beneath the Hazen Plateau, but this is more likely to be inherited from earlier tectonic stages than to be linked to the High Arctic Large Igneous Province. A large-scale basement-involving thrust, possibly linked to a deep detachment of Ellesmerian age, lies immediately south of the Pearya Terrane and forms the northern backdrop to a crustal-scale pop-up structure that accommodates Eurekan-aged shortening in northern Ellesmere Island. The thickest crust and deepest Moho along the transect are below the Central Ellesmerian fold belt, where the Moho is flexured downwards to the north to a depth of about 48 km beneath the load of the structurally thickened supracrustal strata of the fold belt.

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Contents

Geological Society, London, Special Publications

Circum-Arctic Lithosphere Evolution

V. Pease
V. Pease
Stockholm University, Sweden
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B. Coakley
B. Coakley
University of Alaska, Fairbanks, USA
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The Geological Society of London
Volume
460
ISBN electronic:
9781786203410
Publication date:
January 01, 2018

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