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Eocene to Miocene igneous activity in NE Greenland: northward younging of magmatism along the East Greenland margin

Lotte M. Larsen, Asger K. Pedersen, Christian Tegner and Robert A. Duncan
Journal of the Geological Society, 171, 539-553, 20 March 2014, https://doi.org/10.1144/jgs2013-118
Lotte M. Larsen
1Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
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  • For correspondence: lml@geus.dk
Asger K. Pedersen
1Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
2Natural History Museum of Denmark, Øster Voldgade 5–7, DK-1350 Copenhagen K, Denmark
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Christian Tegner
3Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
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Robert A. Duncan
4College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA
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Abstract

Radiometric dating by the 40Ar–39Ar incremental heating method was carried out on lavas, sills, dykes, and a central intrusion from NE Greenland. Eighteen samples gave acceptable crystallization ages. Lavas of both Lower and Upper Plateau Lava Series gave ages in the range 55.5–53.5 Ma and cannot be constrained to better than 56–53 Ma. Sills and dykes from Traill Ø to Shannon, with compositions fairly similar to those of the lavas, gave ages of 55.1–51.3 Ma, contemporaneous with and slightly younger than the lavas. Alkaline lavas on inland nunataks have ages of 53–50 Ma, and the Kap Broer Ruys intrusive centre has an age of 48.7 ± 0.5 Ma. An alkaline sill on Hvalrosø is much younger at 20.3 ± 0.1 Ma. There are no pre-breakup lavas onshore NE Greenland. We surmise that the hot mantle of the Iceland plume arrived and melted extensively beneath the northern basins only at the time of breakup around 55 Ma. Post-breakup intrusive events in NE Greenland coincided with plate-tectonic events such as reorganization, uplift and opening in the north. The Hvalrosø sill represents a local small melting event that may be related to coeval opening of the Lena Trough.

Supplementary materials: Details of the source data, results, and the compositions and locations of the dated samples, are available at www.geolsoc.org.uk/SUP18738.

  • © 2014 The Geological Society of London
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Journal of the Geological Society: 171 (4)
Journal of the Geological Society
Volume 171, Issue 4
July 2014
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Eocene to Miocene igneous activity in NE Greenland: northward younging of magmatism along the East Greenland margin

Lotte M. Larsen, Asger K. Pedersen, Christian Tegner and Robert A. Duncan
Journal of the Geological Society, 171, 539-553, 20 March 2014, https://doi.org/10.1144/jgs2013-118
Lotte M. Larsen
1Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: lml@geus.dk
Asger K. Pedersen
1Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
2Natural History Museum of Denmark, Øster Voldgade 5–7, DK-1350 Copenhagen K, Denmark
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Christian Tegner
3Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
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  • Find this author on PubMed
  • Search for this author on this site
Robert A. Duncan
4College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA
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  • Search for this author on this site

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Eocene to Miocene igneous activity in NE Greenland: northward younging of magmatism along the East Greenland margin

Lotte M. Larsen, Asger K. Pedersen, Christian Tegner and Robert A. Duncan
Journal of the Geological Society, 171, 539-553, 20 March 2014, https://doi.org/10.1144/jgs2013-118
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  • Article
    • Abstract
    • Geological setting and sample selection
    • Analytical methods
    • Results
    • Age of igneous rocks along the East Greenland margin
    • Magmatism related to the tectonic development of the North Atlantic
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