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Synthetic Systems for Modeling Hybridization between Hydrous Siliceous Magmas and Peridotite in Subduction Zones

Sekine, Toshimori and Wyllie, Peter J. (1982) Synthetic Systems for Modeling Hybridization between Hydrous Siliceous Magmas and Peridotite in Subduction Zones. Journal of Geology, 90 (6). pp. 734-741. ISSN 0022-1376. http://resolver.caltech.edu/CaltechAUTHORS:20160211-152332821

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Abstract

The system KalSiO_4-Mg_2SiO_4-SiO_2-H_2O includes model representatives of (1) hydrous siliceous magma from subducted oceanic crust (the eutectic liquid in KalSi_3O_8-SiO_2-H_2O, and (2) the overlying mantle peridotite (forsterite+enstatite). Isothermal sections at 20 kbar to 30 kbar illustrate that hybridization causes precipitation of phlogopite, quartz, and enstatite, with little change in content of the liquid. The effects of CaO, Na_2O, and Al_2O_3 are examined by reviewing available data on phase relationships with additional components CaMgSi_2O_6, NaAlSiO_4, Al_2O_3 , and CaAl_2Si_2O_8. Addition of Na_2O and CaO changes the hybridization reactions by reducing the amount of phlogopite and by adding jadeitic clinopyroxene to the precipitation products, Addition of CaO and Al_2O_3 includes garnet among the precipitation products. The synthetic model systems appear to represent a good basis for extrapolation to the complex natural rock system. If minerals precipitating during hybridization are separated from melt by physical processes, discrete masses of phlogopite rocks, and phlogopite-garnet-websterites, may form a heterogeneous layer above subducted oceanic crust, which is transported deeper than the main, -fluxed sites of magma generation. Values of Mg/(Mg+Fe) of the hybridized layer are probably similar to that of the mantle.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/628728DOIArticle
http://www.journals.uchicago.edu/doi/10.1086/628728PublisherArticle
http://www.jstor.org/stable/30081038JSTORArticle
Additional Information:© 1982 University of Chicago Press. Manuscript received June 30, 1982; accepted August 2, 1982. This research was supported by the Earth Sciences Section of the National Science Foundation, NSF Grant EAR 81-08626.
Funders:
Funding AgencyGrant Number
NSFEAR 81-08626
Record Number:CaltechAUTHORS:20160211-152332821
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160211-152332821
Official Citation:Toshimori Sekine , and Peter J. Wyllie . "Synthetic Systems for Modeling Hybridization between Hydrous Siliceous Magmas and Peridotite in Subduction Zones." The Journal of Geology 1982; 90(6), 734-741. DOI: 10.1086/628728
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64434
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Feb 2016 22:07
Last Modified:19 Feb 2016 22:07

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