A joint geochemical–geophysical record of time-dependent mantle convection south of Iceland

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A joint geochemical–geophysical record of time-dependent mantle convection south of Iceland. / Jones, Stephen; Murton, B.j.; Fitton, J.g.; White, N.j.; Maclennan, J.; Walters, R.l.

In: Earth and Planetary Science Letters, Vol. 386, 15.01.2014, p. 86-97.

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Jones, Stephen ; Murton, B.j. ; Fitton, J.g. ; White, N.j. ; Maclennan, J. ; Walters, R.l. / A joint geochemical–geophysical record of time-dependent mantle convection south of Iceland. In: Earth and Planetary Science Letters. 2014 ; Vol. 386. pp. 86-97.

Bibtex

@article{52ddcf0ba20743d8bd2ff347b5d7c4ad,
title = "A joint geochemical–geophysical record of time-dependent mantle convection south of Iceland",
abstract = "The North Atlantic V-Shaped Ridges (VSRs) provide a spatially extensive and clear record of unsteady mantle convective circulation over >40 My. VSRs are diachronous ridges of thick crust formed with a periodicity of ∼5 My along the Mid Atlantic Ridge, south of Iceland. We present data from a set of dredged basalt samples that shows chemical variation associated with two complete VSR crustal thickness cycles where they intersect the Mid Atlantic Ridge. The new dataset also records chemical variation associated with a VSR crustal thickness cycle along a plate spreading flow-line. Inverse correlations between crustal thickness and both incompatible trace element concentrations and incompatible element ratios such as Nb/Y and La/Sm are observed. Geochemical and crustal thickness observations can be matched using a time-dependent mid-ocean ridge melting model with a basal boundary condition of sinusoidally varying potential temperature. Our observations and models suggest that VSRs are generated when hot patches are carried up the plume stem beneath SE Iceland and spread radially outward within the asthenosphere. These patches are then drawn upward into the melting region when passing beneath the Mid Atlantic Ridge. The geometry of the VSRs and the size of the dynamically supported swell suggest that the Iceland Plume is the strongest plume in the Earth at present, with a volume flux of View the MathML source.",
keywords = "plume–ridge interaction, plume pulsing, plume flux, Reykjanes Ridge, North Atlantic",
author = "Stephen Jones and B.j. Murton and J.g. Fitton and N.j. White and J. Maclennan and R.l. Walters",
year = "2014",
month = jan,
day = "15",
doi = "10.1016/j.epsl.2013.09.029",
language = "English",
volume = "386",
pages = "86--97",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - A joint geochemical–geophysical record of time-dependent mantle convection south of Iceland

AU - Jones, Stephen

AU - Murton, B.j.

AU - Fitton, J.g.

AU - White, N.j.

AU - Maclennan, J.

AU - Walters, R.l.

PY - 2014/1/15

Y1 - 2014/1/15

N2 - The North Atlantic V-Shaped Ridges (VSRs) provide a spatially extensive and clear record of unsteady mantle convective circulation over >40 My. VSRs are diachronous ridges of thick crust formed with a periodicity of ∼5 My along the Mid Atlantic Ridge, south of Iceland. We present data from a set of dredged basalt samples that shows chemical variation associated with two complete VSR crustal thickness cycles where they intersect the Mid Atlantic Ridge. The new dataset also records chemical variation associated with a VSR crustal thickness cycle along a plate spreading flow-line. Inverse correlations between crustal thickness and both incompatible trace element concentrations and incompatible element ratios such as Nb/Y and La/Sm are observed. Geochemical and crustal thickness observations can be matched using a time-dependent mid-ocean ridge melting model with a basal boundary condition of sinusoidally varying potential temperature. Our observations and models suggest that VSRs are generated when hot patches are carried up the plume stem beneath SE Iceland and spread radially outward within the asthenosphere. These patches are then drawn upward into the melting region when passing beneath the Mid Atlantic Ridge. The geometry of the VSRs and the size of the dynamically supported swell suggest that the Iceland Plume is the strongest plume in the Earth at present, with a volume flux of View the MathML source.

AB - The North Atlantic V-Shaped Ridges (VSRs) provide a spatially extensive and clear record of unsteady mantle convective circulation over >40 My. VSRs are diachronous ridges of thick crust formed with a periodicity of ∼5 My along the Mid Atlantic Ridge, south of Iceland. We present data from a set of dredged basalt samples that shows chemical variation associated with two complete VSR crustal thickness cycles where they intersect the Mid Atlantic Ridge. The new dataset also records chemical variation associated with a VSR crustal thickness cycle along a plate spreading flow-line. Inverse correlations between crustal thickness and both incompatible trace element concentrations and incompatible element ratios such as Nb/Y and La/Sm are observed. Geochemical and crustal thickness observations can be matched using a time-dependent mid-ocean ridge melting model with a basal boundary condition of sinusoidally varying potential temperature. Our observations and models suggest that VSRs are generated when hot patches are carried up the plume stem beneath SE Iceland and spread radially outward within the asthenosphere. These patches are then drawn upward into the melting region when passing beneath the Mid Atlantic Ridge. The geometry of the VSRs and the size of the dynamically supported swell suggest that the Iceland Plume is the strongest plume in the Earth at present, with a volume flux of View the MathML source.

KW - plume–ridge interaction

KW - plume pulsing

KW - plume flux

KW - Reykjanes Ridge

KW - North Atlantic

U2 - 10.1016/j.epsl.2013.09.029

DO - 10.1016/j.epsl.2013.09.029

M3 - Article

VL - 386

SP - 86

EP - 97

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

ER -