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Seismic volcanostratigraphy of the NE Greenland continental margin

By
Wolfram H. Geissler
Wolfram H. Geissler
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany
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Carmen Gaina
Carmen Gaina
Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Sem Sælands vei 24, PO Box 1048, Blindern, NO-0316 Oslo, Norway
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John R. Hopper
John R. Hopper
Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen K, Denmark
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Thomas Funck
Thomas Funck
Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen K, Denmark
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Anett Blischke
Anett Blischke
Iceland GeoSurvey, Branch at Akureyri, Rangárvöllum, 602 Akureyri, Iceland
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Uni Arting
Uni Arting
Jarðfeingi, Faroese Earth and Energy Directorate, Brekkutún 1, 110 Tórshavn, Faroe Islands
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Jim Á Horni
Jim Á Horni
Jarðfeingi, Faroese Earth and Energy Directorate, Brekkutún 1, 110 Tórshavn, Faroe Islands
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Gwenn Péron-Pinvidic
Gwenn Péron-Pinvidic
Geological Survey of Norway, Leiv Eirikssons vei 39, 7040 Trondheim, Norway
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Mansour M. Abdelmalak
Mansour M. Abdelmalak
Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Sem Sælands vei 24, PO Box 1048, Blindern, NO-0316 Oslo, Norway
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Published:
January 01, 2017

Abstract:

The Early Eocene continental break-up between the NE Greenland and the mid-Norwegian–SW Barents Sea margins was associated with voluminous magmatism and led to the emplacement of massive volcanic complexes including wedges of seawards-dipping reflections (SDR). We study the distribution of these break-up-related volcanic rocks along the NE Greenland margin by revisiting existing seismic reflection data and comparing our observations to better-studied segments of the conjugate margin. Seismic facies types match between the conjugate margins and show strong lateral variations. Seaward-dipping wedges are mapped offshore East Greenland, the conjugate to the Vøring continental margin. The geophysical signature of the SDRs becomes less visible towards the north, as it does along the conjugate Lofoten–Vesterålen margin. We suggest that the Traill Ø volcanic ridge is a result of plume–ridge interactions formed between approximately 54 and 47 Ma. North of the East Greenland Ridge, strong basement reflections conjugate to the Vestbakken Volcanic Province are interpreted as lava flows or ‘spurious’ SDRs. We discuss our findings in conjunction with results from seismic wide-angle experiments, gravity and magnetic data. We focus on the spatial and temporal relationships of the break-up volcanic rocks, and their structural setting in a late rift and initial oceanic drift stage.

Supplementary material: The figures show the original seismic data used as the base for the interpretations shown in this paper. The seismic profiles are marked on Figure 1 (in the paper) as numbers 1 to 10 and are available at https://doi.org/10.6084/m9.figshare.c.3593780

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Contents

Geological Society, London, Special Publications

The NE Atlantic Region. A Reappraisal of Crustal Structure, Tectonostratigraphy and Magmatic Evolution

G. Péron-Pinvidic
G. Péron-Pinvidic
Geological Survey of Norway, Norway
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J. R. Hopper
J. R. Hopper
Geological Survey of Denmark and Greenland, Denmark
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T. Funck
T. Funck
Geological Survey of Denmark and Greenland, Denmark
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M. S. Stoker
M. S. Stoker
British Geological Survey, UK
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C. Gaina
C. Gaina
University of Oslo, Norway
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J. C. Doornenbal
J. C. Doornenbal
Geological Survey of The Netherlands, The Netherlands
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U. E. Árting
U. E. Árting
Faroese Geological Survey, Faroe Islands
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The Geological Society of London
Volume
447
ISBN electronic:
978-1-78620-37-00
Publication date:
January 01, 2017

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