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Experimental study of interaction between hydrous granite melt and amphibolite

Rutter, Michael J. and Wyllie, Peter J. (1989) Experimental study of interaction between hydrous granite melt and amphibolite. Geological Magazine, 126 (06). pp. 633-646. ISSN 0016-7568. doi:10.1017/S0016756800006932.

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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 SiO_2 in 1000 years.

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Additional Information:© 1989 Cambridge University Press. Received June 14 1988; Revised February 14 1989; Accepted March 02 1989. This work was supported by NSF grant EAR85-06857 to Peter J. Wyllie. We would like to thank Paula Rosener, Edward Stolper and Art Chodos for assistance and discussion regarding the analytical methods. Constructive comments from E. Bruce Watson and Colin Donaldson were much appreciated.
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Issue or Number:06
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Official Citation:Michael J. Rutter and Peter J. Wyllie (1989). Experimental study of interaction between hydrous granite melt and amphibolite. Geological Magazine, 126, pp 633-646. doi:10.1017/S0016756800006932
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64902
Deposited By: Tony Diaz
Deposited On:01 Mar 2016 21:44
Last Modified:10 Nov 2021 23:37

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