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Experimental study of interaction between hydrous granite melt and amphibolite

Published online by Cambridge University Press:  01 May 2009

Michael J. Rutter  and
Peter J. Wyllie
Michael J. Rutter
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology170–25, Pasadena, CA 91125, U.S.A.
Peter J. Wyllie
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology170–25, Pasadena, CA 91125, U.S.A.
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Abstract

We have investigated the reaction between crystalline amphibolite and hydrous granite melt in static experiments at 810 °C and 1.5 kbar. Boundary layer concentration gradients in quenched silicate glass for the major element oxides and the volatile components, water and carbon dioxide, were measured using electron probe analysis and Fourier Transform Infrared Spectroscopy, respectively. We found a measurable change in the concentration of all components adjacent to the amphibolite in experiments of 66 and 330 hours duration. After I hour there was no detectable change in the concentration of major element oxides in the granitic glass, but steep concentration profiles were determined for carbon dioxide and water. A bubble-free zone developed adjacent to the amphibolite in the 66 hour experiment, and this zone increased in width after 330 hours. Reaction is controlled by dissolution of amphibolite and by transport of dissolved material through the granite melt. The rate-controlling process is chemical diffusion in the melt phase. Results confirm that in the absence of convective heat transfer and/or mechanical disaggregation of mafic inclusions, assimilation of mafic rocks by granite melt is very slow, corresponding to on the order of 10 mm for SiO2 in 1000 years.

Type
Articles
Information
Geological Magazine , Volume 126 , Issue 6 , November 1989 , pp. 633 - 646
Copyright
Copyright © Cambridge University Press 1989

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