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Stress generation at ridge axes by plate divergence and magma rise

W. R. Jacoby and B. Higgs
Journal of the Geological Society, 152, 1017-1021, 1 November 1995, https://doi.org/10.1144/GSL.JGS.1995.152.01.23
W. R. Jacoby
1Institut für Geowissenschaften, Johannes Gutenberg Universität Mainz D-55099 Mainz, Germany
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B. Higgs
2Department of Geology, University College Cork Cork, Ireland
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Abstract

A model is explored for the rifting process particularly at the divergent plate boundary in Iceland, based on direct observations of the Krafla rifting episode 1975–1984. Magma accumulates near the axial crust-mantle transition as the plates diverge from each other and compression on the boundary decreases. Two-dimensional finite-element modelling is applied to investigate how divergence and buoyant rise of magma interact in triggering rifting. Both processes are found to be important, but long intervals between rifting episodes require the time-average deviatoric stress to be compressible normal to the axis.

Keywords
  • Iceland
  • mid-ocean ridges
  • stress
  • rifting
  • magmas
  • © Geological Society 1995

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In this issue

Journal of the Geological Society: 152 (6)
Journal of the Geological Society
Volume 152, Issue 6
November 1995
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Stress generation at ridge axes by plate divergence and magma rise

W. R. Jacoby and B. Higgs
Journal of the Geological Society, 152, 1017-1021, 1 November 1995, https://doi.org/10.1144/GSL.JGS.1995.152.01.23
W. R. Jacoby
1Institut für Geowissenschaften, Johannes Gutenberg Universität Mainz D-55099 Mainz, Germany
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B. Higgs
2Department of Geology, University College Cork Cork, Ireland
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Stress generation at ridge axes by plate divergence and magma rise

W. R. Jacoby and B. Higgs
Journal of the Geological Society, 152, 1017-1021, 1 November 1995, https://doi.org/10.1144/GSL.JGS.1995.152.01.23
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