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Journal of the Geological Society; 1997; v. 154; issue.3; p. 437-442;
DOI: 10.1144/gsjgs.154.3.0437
© 1997 Geological Society of London

Article

Continental eclogites and the Wilson Cycle

P. D. RYAN1 & J. F. DEWEY2

1 Department of Geology, University College Galway, Ireland (e-mail: ryan{at}alisanos.ucg.ie)
2 Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3 PR, UK

The Wilson Cycle, the repeated opening and closing of oceans, commonly along roughly the same lines, is here attributed to the presence of eclogite-facies roots of partially collapsed orogens. We present a finite-element thermal model that suggests that such roots will weaken the orogenic lithosphere relative to that of the adjacent foreland for hundreds of millions of years and make it a preferred site for later rifting.


Keywords: Wilson Cycle, continental margin, orogenic belts, eclogite.




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