Unknown
Geological Society
In:
EPIC3The NE Atlantic Region: A Reappraisal of Crustal Structure, Tectonostratigraphy and Magmatic Evolution, Geological Society, London, Special Publications, London, Geological Society
Publication Date:
2021-01-26
Description:
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 betterstudied
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–Vestera°len
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.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Inbook
,
peerRev
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