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Science 29 March 1996:
Vol. 271. no. 5257, pp. 1845 - 1848
DOI: 10.1126/science.271.5257.1845
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Reports

Constraints on Rates of Granitic Magma Transport from Epidote Dissolution Kinetics

Alan D. Brandon, * Robert A. Creaser, Thomas Chacko

Epidote is stable only at high pressure in granitic magmas but is found in magmas crystallized at shallow crustal levels. This observation suggests qualitatively that magma transport is sufficiently rapid to prevent complete epidote resorption. Experimental measurements of epidote dissolution showed that the presence of epidote implies that magma transport from the deep crust in these systems was rapid and that the transport was by dikes rather than diapirs.

A. D. Brandon, Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, DC 20015, USA.
R. A. Creaser and T. Chacko, Department of Earth and Atmospheric Sciences, University of Alberta, 126 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada.
* To whom correspondence should be addressed.


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