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Continental rift zone magmatism

  • Marjorie Wilson

Abstract

Basaltic magmatism appears to be a common manifestation of extensional tectonics within continental plates. In Chapter 10 we focused our attention on the dominantly fissure-fed sub-alkaline (tholeiitic) flood basalt provinces, whereas in this chapter we shall concentrate on those more alkaline provinces, closely associated with rift/graben structures, fed from both fissure and central vent activity. As we have previously stated, this is a totally artificial subdivision, and in reality there is a complete spectrum of intracontinental plate magmatic activity, from extensive sub-alkaline flood basalt provinces to largely amagmatic graben structures with localized centres of alkaline volcanism.

Keywords

Crustal Contamination East African Rift Ethiopian Rift Western Branch East African Rift System 
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Further reading

  1. Bailey, D.K. 1983. The chemical and thermal evolution of rifts. Tectonophysics 94, 585–97.CrossRefGoogle Scholar
  2. Basaltic Volcanism Study Project 1981. Basaltic volcanism on the terrestrial planets. New York: Pergamon Press 108–31.Google Scholar
  3. Bosworth, W. 1985. Geometry of propagating continental rifts. Nature 316, 625–7.CrossRefGoogle Scholar
  4. Girdler, R.W. 1983. Processes of planetary rifling as seen in the rifting and breakup of Africa. Tectonophysics 94, 241–52.CrossRefGoogle Scholar
  5. Keen, C.E. 1985. The dynamics of rifling: deformation of the lithosphere by active and passive driving forces. Geophys. J.R. Astron. Soc. 80, 95–120.CrossRefGoogle Scholar
  6. Palmason, G. 1982. Continental and oceanic rifts. Washington, DC: American Geophysical Union.CrossRefGoogle Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  • Marjorie Wilson
    • 1
  1. 1.Department of Earth SciencesUniversity of LeedsLeedsUK

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