A rapid mechanism to remobilize and homogenize highly crystalline magma bodies

Alain Burgisser () and George W. Bergantz
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Alain Burgisser: Institut des Sciences de la Terre d’Orléans, CNRS/INSU, Université d’Orléans, Université François Rabelais—Tours, 1A rue de la Férolerie
George W. Bergantz: University of Washington, Box 351310

Nature, 2011, vol. 471, issue 7337, 212-215

Abstract: Two-stage process remixes magma A range of apparently contradictory observations from both large plutonic bodies (igneous rocks that solidified below Earth's surface) and volcanic systems can be explained by a mechanism of rapid remobilization or 'unzipping' of highly viscous crystal-rich magma. Alain Burgisser and George Bergantz show that this remobilization can lead to rapid overturn, producing the juxtaposition of magmatic materials with very disparate ages and complex chemical zoning that is observed in the great bodies of granite. Agreement between calculated and observed unzipping rates for historical eruptions at Pinatubo and Montserrat demonstrates the potentially wide applicability of the model.

Date: 2011
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DOI: 10.1038/nature09799

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