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Circum-Arctic Lithosphere Evolution

Geological Society, London, Special Publications

Circum-Arctic Lithosphere Evolution
CONTAINS OPEN ACCESS

Author(s)

The Geological Society of London

Volume

460

DOI:

https://doi.org/10.1144/SP460

Copyright:

Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

ISBN electronic:

9781786203410

ISBN print:

9781786203236

Publication date:

January 01, 2018

Book Chapter

Samples from the Lomonosov Ridge place new constraints on the geological evolution of the Arctic Ocean

Author(s)

C. Knudsen

¹Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

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J. R. Hopper

¹Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

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P. R. Bierman

²Department of Geology and School of Natural Resources, University of Vermont, Burlington, VT 05405-0122, USA

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M. Bjerager

¹Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

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T. Funck

¹Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

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P. F. Green

³Geotrack International Pty Ltd, 37 Melville Road, Brunswick West, Victoria 3055, Australia

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J. R. Ineson

¹Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

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P. Japsen

¹Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

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C. Marcussen

¹Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

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S. C. Sherlock

⁴The Open University, Walton Hall, Milton Keynes MK7 6AA, UK

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T. B. Thomsen

¹Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

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Doi:

https://doi.org/10.1144/SP460.17

Published:

January 01, 2018

Abstract

A number of rock samples were collected from two dredge positions on the Lomonosov Ridge at water depths of 2–3.5 km. The dredge samples are dominated by sediments deformed and metamorphosed under greenschist-facies conditions 470 myr ago according to ⁴⁰Ar/³⁹Ar dating of metamorphic muscovite. This shows that the Lomonosov Ridge was involved in a major Mid-Ordovician orogenic event that correlates with early arc–terrane accretion observed in northern Ellesmere Island, Svalbard, and other parts of the Caledonian belt. Detrital zircon age spectra of these metasediments span the Mesoproterozoic–Palaeoproterozoic with a main peak at around 1.6 Ga, and...

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