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Hybridization of magmas above subducted oceanic crust

Sekine, Toshimore and Wyllie, Peter J. (1985) Hybridization of magmas above subducted oceanic crust. Geologica Carpathica, 36 (3). pp. 259-268. ISSN 1336-8052.

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Hydrous siliceous melts rising from subducted oceanic crust may experience hybridization with overlying peridotite. Products of hybridization have been explored in the synthetic system KAlSiO_4-MgO-SiO_2-H_2O. The phase diagrams were used to interpret phase relationships determined at 30 kbar for mixtures of granite, peridotite, and H_2O. Results indicate that solution of peridotite in hydrous, H_2O-undersaturated granitic liquid at 900 °C, 30 kbar, causes only small changes in liquid composition, and precipitation of phlogopite-garnet-websterite. Additional experiments, set up with H_2O-undersaturated granite liquid in contact with solid peridotite at 30 kbar, 850-1050 °C, produced hybrid reaction zones containing orthopyroxene and clinopyroxene in all runs, and one or more of garnet, phlogopite, and quartz in some runs. The hybridization process in subduction zones could produce discrete rock bodies dominated by pyroxenite (without olivine); there is a prospect that potassium could become concentrated into phlogopite-rich rocks. The heterogeneous rock layer produced above subducted crust provides aqueous fluids expelled during hybridization, which rise to generate in overlying mantle the H_2O-undersaturated basic magnesian magma which is the probable parent of the calc-alkalic rock series erupted at the volcanic front.

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Alternate Title:Hybridation magmatique au-dessus de la croûte océanique subductée
Additional Information:© 1985 De Gruyter. Manuscript received November 17, 1984. This research was supported by the Earth Sciences Section of the National Science Foundation, Grants EAR 82-06178 and EAR 83-41623.
Funding AgencyGrant Number
NSFEAR 82-06178
NSFEAR 83-41623
Issue or Number:3
Record Number:CaltechAUTHORS:20160210-153527640
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64390
Deposited By: Tony Diaz
Deposited On:10 Feb 2016 23:46
Last Modified:03 Oct 2019 09:37

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