3 research outputs found
Regional distribution of volcanism within the North Atlantic Igneous Province
An overview of the distribution of volcanic facies units was compiled over the North Atlantic region. The new maps establish the pattern of volcanism associated with breakup and the initiation of seafloor spreading over the main part of the North Atlantic Igneous Province (NAIP). The maps include new analysis of the FaroeâShetlands region that allows for a consistent volcanic facies map to be constructed over the entire eastern margin of the North Atlantic for the first time. A key result is that the various conjugate margin segments show a number of asymmetric patterns that are interpreted to result in part from pre-existing crustal and lithospheric structures. The compilation further shows that while the lateral extent of volcanism extends equally far to the south of the Iceland hot spot as it does to the north, the volume of material emplaced to the south is nearly double of that to the north. This suggests that a possible southward deflection of the Iceland mantle plume is a long-lived phenomenon originating during or shortly after impact of the plume
Seismic volcano-stratigraphy of the Northeast Greenland continental margin
The Early Eocene continental break-up between the NE Greenland and the mid-
NorwegianâSW 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 VĂžring continental margin. The geophysical signature of the
SDRs becomes less visible towards the north, as it does along the conjugate LofotenâVestera°len
margin. We suggest that the Traill Ă volcanic ridge is a result of plumeâridge 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 âspuriousâ
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
Seismic volcanostratigraphy of the NE Greenland continental margin
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