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Integrated crustal-geological cross-section of Ellesmere Island

R. Stephenson, Karsten Piepjohn, C. Schiffer, Werner von Gosen, G. N. Oakey and G. Anudu
Integrated crustal-geological cross-section of Ellesmere Island (in Circum-Arctic lithosphere evolution, V. Pease (editor) and B. Coakley (editor))
Special Publication - Geological Society of London (May 2017) 460 (1): 7-17

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.


ISSN: 0305-8719
EISSN: 2041-4927
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 460
Serial Issue: 1
Title: Integrated crustal-geological cross-section of Ellesmere Island
Title: Circum-Arctic lithosphere evolution
Author(s): Stephenson, R.Piepjohn, KarstenSchiffer, C.von Gosen, WernerOakey, G. N.Anudu, G.
Author(s): Pease, V.editor
Author(s): Coakley, B.editor
Affiliation: University of Aberdeen, School of Geosciences, Geology and Petroleum Geology, Aberdeen, United Kingdom
Pages: 7-17
Published: 20170523
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 50
Accession Number: 2017-082564
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 1 table, geol. sketch map
N79°00'00" - N83°00'00", W77°00'00" - W72°00'00"
N79°00'00" - N83°00'00", W82°00'00" - W77°00'00"
Secondary Affiliation: Bundesanstalt fuer Geowissenschaften und Rohstoffe, DEU, GermanyDurham University, GBR, United KingdomFriedrich-Alexander-Universitaet Erlangen-Nuernberg, DEU, GermanyCanadian Geological Survey, CAN, Canada
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201743
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