Architecture of North Atlantic contourite drifts modified by transient circulation of the Icelandic mantle plume Parnell-Turner, Ross White, Nicholas J. McCave, I. Nick Henstock, Timothy J. Murton, Bramley J. Jones, Stephen M. 2016-01-08T15:54:43Z 2016-04-15T07:49:23Z 2015-10-15
dc.description Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 16 (2015): 3414–3435, doi:10.1002/2015GC005947. en_US
dc.description.abstract Overflow of Northern Component Water, the precursor of North Atlantic Deep Water, appears to have varied during Neogene times. It has been suggested that this variation is moderated by transient behavior of the Icelandic mantle plume, which has influenced North Atlantic bathymetry through time. Thus pathways and intensities of bottom currents that control deposition of contourite drifts could be affected by mantle processes. Here, we present regional seismic reflection profiles that cross sedimentary accumulations (Björn, Gardar, Eirik, and Hatton Drifts). Prominent reflections were mapped and calibrated using a combination of boreholes and legacy seismic profiles. Interpreted seismic profiles were used to reconstruct solid sedimentation rates. Björn Drift began to accumulate in late Miocene times. Its average sedimentation rate decreased at ∼2.5 Ma and increased again at ∼0.75 Ma. In contrast, Eirik Drift started to accumulate in early Miocene times. Its average sedimentation rate increased at ∼5.5 Ma and decreased at ∼2.2 Ma. In both cases, there is a good correlation between sedimentation rates, inferred Northern Component Water overflow, and the variation of Icelandic plume temperature independently obtained from the geometry of diachronous V-shaped ridges. Between 5.5 and 2.5 Ma, the plume cooled, which probably caused subsidence of the Greenland-Iceland-Scotland Ridge, allowing drift accumulation to increase. When the plume became hotter at 2.5 Ma, drift accumulation rate fell. We infer that deep-water current strength is modulated by fluctuating dynamic support of the Greenland-Scotland Ridge. Our results highlight the potential link between mantle convective processes and ocean circulation. en_US
dc.description.embargo 2016-04-15 en_US
dc.description.sponsorship Natural Environment Research Council Grant Number: NE/G007632/1; The University of Cambridge Girdler Fund; BP Exploration en_US
dc.format.mimetype application/pdf
dc.identifier.citation Geochemistry, Geophysics, Geosystems 16 (2015): 3414–3435 en_US
dc.identifier.doi 10.1002/2015GC005947
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.subject Contourite en_US
dc.subject Drift en_US
dc.subject Iceland en_US
dc.subject Plume en_US
dc.title Architecture of North Atlantic contourite drifts modified by transient circulation of the Icelandic mantle plume en_US
dc.type Article en_US
dspace.entity.type Publication
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