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Experimental Simulation of Mantle Hybridization in Subduction Zones

Sekine, Toshimori and Wyllie, Peter J. (1983) Experimental Simulation of Mantle Hybridization in Subduction Zones. Journal of Geology, 91 (5). pp. 511-528. ISSN 0022-1376. doi:10.1086/628802.

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Experiments conducted at 30 kbar, 850-1050°C, in piston-cylinder apparatus simulate hybridization between hydrous siliceous magma rising from subducted oceanic crust into overlying peridotite. Gold capsules containing granite and peridotite powders separated by sharp boundaries, and H_2O, were run in vertical and horizontal positions. The aqueous vapor caused minor metasomatic changes in the peridotite until it was withdrawn into the melting granite, producing H_2O-undersaturated granite liquid adjacent sintered, anhydrous peridotite. Minerals developed in the hybrid reaction zones between liquid and peridotite are orthopyroxene and jadeitic clinopyroxene in all runs, and one or more of garnet, phlogopite, and quartz in some runs. (The granite liquid moves upwards relative to the peridotite even in runs of 27 hours.) In the longest runs of 120 hours the hybridization zone remains narrow, the body of granite liquid remains crystal-free and only slightly changed in composition (lower SiO_2, MgO increased from 0.1% to about 1.5%). The products are consistent with phase equilibria in synthetic model systems, and the system peridotite-granite-H_2O (determined using mixtures). The hybridization process in subduction zones would produce discrete rock bodies dominated by pyroxenites without olivine. Na is fixed in jadeitic clinopyroxene. K is fixed in phlogopite dispersed through the pyroxenite, but there is a prospect that it may become concentrated into phlogopite-rich rocks by crystal fractionation. Partial melting of these source rocks would generate magmas different from those generated in peridotite or subducted oceanic crust.

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Additional Information:© 1983 University of Chicago Press. Manuscript received August 27, 1982; revised May 15, 1983. This research was supported by the Earth Sciences Section of the National Science Foundation, NSF Grants EAR 81-08626 and 82-06178. For a critical reading of the manuscript, we thank A. T. Anderson, T. L. Grove, and R. W. Kay.
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NSFEAR 81-08626
NSFEAR 82-06178
Issue or Number:5
Record Number:CaltechAUTHORS:20160219-083147638
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Official Citation:Toshimori Sekine , and Peter J. Wyllie . "Experimental Simulation of Mantle Hybridization in Subduction Zones." The Journal of Geology 1983; 91(5), 511-528. DOI: 10.1086/628802
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64602
Deposited By: Tony Diaz
Deposited On:19 Feb 2016 19:09
Last Modified:10 Nov 2021 23:33

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