McHone, J. Gregory and Anderson, Don L. and Beutel, Erin K. and Fialko, Yuri A. (2005) Giant dikes, rifts, flood basalts, and plate tectonics: A contention of mantle models. In: Plates, Plumes, and Paradigms. Special papers (Geological Society of America) (388). Geological Society of America , Boulder, CO, pp. 401-420. ISBN 9780813723884 http://resolver.caltech.edu/CaltechAUTHORS:20121012-145716653
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Giant dike swarms, often hundreds of kilometers long, have produced flood basalts in large igneous provinces since the early Proterozoic. Dike patterns described as radiating from a central source are actually syntectonic swarms that curve and diverge according to lithospheric stress regimes, but they are similar in origin to smaller swarms with parallel dikes. Giant radiating patterns of dikes do not characterize most hotspots or large igneous provinces, and they are not always linked to crustal uplift swells. These mafic intrusions and the fractures they follow are essentially features of plate tectonics, not products of indeterminable deep mantle plumes. As a compelling example, the Early Jurassic central Atlantic magmatic province and its associated Pangaean rift zone are evidential products of subducted materials and convection in the upper mantle beneath the insulating Pangaean plate. Giant dike swarms were formed along lithospheric structures through plate tectonics, not by a coincidental deep mantle plume.
|Item Type:||Book Section|
|Additional Information:||© 2005 Geological Society of America. Manuscript accepted by the Society January 3, 2005. We thank Gillian Foulger for encouraging us to present alternate ideas about this contentious problem and for her help with our writing. Editorial comments from James Natland and two anonymous reviewers were helpful in organizing the paper and clarifying our arguments.|
|Subject Keywords:||giant dikes, flood basalt, LIP, plume, tectonics|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||12 Oct 2012 22:58|
|Last Modified:||12 Oct 2012 22:58|
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