Abstract
Convection of the mantle influences elevation at the Earth’s surface. For example, in the North Atlantic Ocean, V-shaped ridges of thickened oceanic crust that straddle the mid-ocean ridge are thought to arise from variations in the underlying mantle properties1. However, the detailed relationship between these V-shaped ridges and convective circulation is uncertain. Here we use measurements of residual water depth—a proxy for crustal thickness—and basaltic geochemistry to assess factors responsible for ridge formation. We find a correlation between basalt composition and crustal thickness that is best explained if V-shaped ridges are formed by the passage of unusually hot pulses of mantle away from Iceland. We also show that ocean circulation patterns over the past 7 million years, recorded by flow of the Northern Component Water2,3,4 from the Norwegian Sea into the Atlantic Ocean and the accumulation of thick drifts of sediment5, are controlled by variations in the elevation of sea floor between Greenland and Iceland. We suggest that pulses of hot mantle also drove periodic uplift of the sea floor, and moderated the export of water and sediment into the North Atlantic Ocean. Diverse observations can therefore be explained if blobs of mantle, 25 °C hotter than the background plume temperature, travelled up the conduit beneath Iceland and spread out radially at velocities of 40 cm yr−1.
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References
White, R. S. & McKenzie, D. Magmatism at rift zones: The generation of volcanic continental margins and flood basalts. J. Geophys. Res. 94, 7685–7729 (1989).
Wright, J. D. & Miller, K. G. Control of North Atlantic Deep Water Circulation by the Greenland–Scotland Ridge. Paleoceanography 11, 157–170 (1996).
Poore, H. R., Samworth, R., White, N. J., Jones, S. M. & McCave, I. N. Neogene overflow of northern component water at the Greenland–Scotland ridge. Geochem. Geophys. Geosyst. 7, 67–82 (2006).
Abelson, M., Agnon, A. & Almogi-Labin, A. Indications for control of the Iceland plume on the Eocene–Oligocene ‘greenhouse–icehouse’ climate transition. Earth Planet. Sci. Lett. 265, 33–48 (2008).
Hunter, S. E. et al. The Eirik Drift: A long-term barometer of North Atlantic deepwater flux south of Cape Farewell, Greenland. Geol. Soc. Spec. Publ. 276, 245–263 (2007).
Schubert, G., Turcotte, D. L. & Olson, P. Mantle Convection in the Earth and Planets 940 (Cambridge Univ. Press, 2001).
Rudge, J. F., Shaw Champion, M. E., White, N., McKenzie, D. & Lovell, B. A plume model of transient diachronous uplift at the Earth’s surface. Earth Planet. Sci. Lett. 267, 146–160 (2008).
Ito, G. Reykjanes V-shaped ridges originating from a pulsing and dehydrating mantle plume. Nature 411, 681–684 (2001).
Searle, R. et al. The Reykjanes Ridge: Structure and tectonics of a hot-spot-influenced, slow spreading ridge, from multi-beam bathymetry, gravity and magnetic investigations. Earth Planet. Sci. Lett. 160, 463–478 (1998).
Vogt, P. R. The Faroe–Iceland–Greenland aseismic ridge and the western boundary undercurrent. Nature 239, 79–81 (1972).
Vogt, P. Asthenosphere motion recorded by the ocean floor south of Iceland. Earth Planet. Sci. Lett. 13, 153–160 (1971).
Jones, S. M., White, N. & Maclennan, J. V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection. Geochem. Geophys. Geosyst. 3, 67–82 (2002).
Smallwood, J. R., White, R. S. & Minshull, T. A. Sea-floor spreading in the presence of the Iceland plume: The structure of the Reykjanes Ridge at 61° 40′ N. J. Geol. Soc. 152, 1023–1029 (1995).
White, R. S., Bown, J. W. & Smallwood, J. R. The temperature of the Iceland plume and origin of outward-propagating V-shaped ridges. J. Geol. Soc. 152, 1039–1045 (1995).
Hey, R., Martinez, F., Höskuldsson, Á. & Benediktsdóttir, Á. Propagating rift model for the V-shaped ridges south of Iceland. Geochem. Geophys. Geosyst. 11, Q03011 (2010).
White, N. & Lovell, B. Measuring the pulse of a plume with the sedimentary record. Nature 387, 888–891 (1997).
Poore, H. R., White, N. & Jones, S. A Neogene chronology of Iceland plume activity from V-shaped ridges. Earth Planet. Sci. Lett. 283, 1–13 (2009).
Delorey, A. A., Dunn, R. A. & Gaherty, J. B. Surface wave tomography of the upper mantle beneath the Reykjanes Ridge with implications for ridge-hot spot interaction. J. Geophys. Res. 112, B08313 (2007).
Wold, C. N. Cenozoic sediment accumulation on drifts in the northern North Atlantic. Paleoceanography 9, 917–941 (1994).
Murton, B. J., Taylor, R. N. & Thirlwall, M. F. Plume-Ridge interaction: A geochemical perspective from the Reykjanes Ridge. J. Petrol. 43, 1987–2012 (2002).
Schilling, J. Iceland mantle plume: Geochemical study of Reykjanes Ridge. Nature 242, 565–571 (1973).
Shorttle, O., Maclennan, J. & Jones, S. M. Control of the symmetry of plume-ridge interaction by spreading ridge geometry. Geochem. Geophys. Geosyst. 13, Q0AC05 (2010).
Jones, S. M., Murton, B. J., Fitton, J. G. & White, N. J. New joint geochemical-geophysical record of time-dependent mantle convection south of Iceland. Abstract U44A-07 presented at 2010 Fall Meeting, AGU, San Francisco, California, 13–17 Dec. (2010).
Kitagawa, H., Kobayashi, K., Makishima, A. & Nakamura, E. Multiple pulses of the mantle plume: Evidence from Tertiary Icelandic lavas. J. Petrol. 49, 1365–1396 (2008).
Maclennan, J., McKenzie, D. & Grönvold, K. Plume-driven upwelling under central Iceland. Earth Planet. Sci. Lett. 194, 67–82 (2001).
Allen, R. M. Imaging the mantle beneath Iceland using integrated seismological techniques. J. Geophys. Res. 107, 67–82 (2002).
White, R. S., McKenzie, D. & O’Nions, R. K. Oceanic crustal thickness from seismic measurements and Rare Earth element inversions. J. Geophys. Res. 97, 19,683–19,715 (1992).
Fitton, J. G., Saunders, A. D., Kempton, P. D. & Hardarson, B. S. Does depleted mantle form an intrinsic part of the Iceland plume? Geochem. Geophys. Geosyst. 4, 67–82 (2003).
Maclennan, J. Lead isotope variability in olivine-hosted melt inclusions from Iceland. Geochim. Cosmochim. Acta 72, 4159–4176 (2008).
Lourens, L., Hilgen, F., Shackleton, N. J., Laskar, J. & Wilson, D. A Geologic Time Scale 409–440 (Cambridge Univ. Press, 2004).
Acknowledgements
H.P. was supported by a NERC PhD studentship. We are grateful to G. Fitton, S. Jones, D. Lyness, D. McKenzie, B. Murton, J. Paul, R. Parnell-Turner, G. Roberts and R. Searle for their help. Cambridge Earth Sciences contribution esc. 2063.
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This project was planned by N.W. Data compilation, analysis, and modelling was carried out by H.P. with guidance from N.W. and J.M. The paper was written by N.W. and J.M. and the figures were drafted by H.P. and J.M.
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Poore, H., White, N. & Maclennan, J. Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume. Nature Geosci 4, 558–561 (2011). https://doi.org/10.1038/ngeo1161
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DOI: https://doi.org/10.1038/ngeo1161
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