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The formation of mantle phlogopite in subduction zone hybridization

Wyllie, Peter J. and Sekine, Toshimori (1982) The formation of mantle phlogopite in subduction zone hybridization. Contributions to Mineralogy and Petrology, 79 (4). pp. 375-380. ISSN 0010-7999. doi:10.1007/BF01132067.

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Extrapolation and extension of phase equilibria in the model system KalSiO_4-Mg_2SiO_4-SiO_2-H_2O suggests that at depths greater than 100 km (deeper than amphibole stability), hybridism between cool hydrous siliceous magma, rising from subducted oceanic crust, and the hotter overlying mantle peridotite produces a series of discrete masses composed largely of phlogopite, orthopyroxene, and clinopyroxene (enriched in Jadeite). Quartz (or coesite) may occur with phlogopite in the lowest part of the masses. The heterogeneous layer thus produced above the subducted oceanic crust provides: (1) aqueous fluids expelled during hybridization and solidification, which rise to generate in overlying mantle (given suitable thermal structure) H_2O-undersaturated basic magma, which is the parent of the calc-alkalic rock series erupted at the volcanic front; (2) masses of phlogopite-pyroxenites which melt when they cross a deeper, high-temperature solidus, yielding the parents of alkalic magmas erupted behind the volcanic front; and (3) blocks of phlogopite-pyroxenites which may rise diapirically for long-term residence in continental lithosphere, and later contribute to the potassium (and geochemically-related elements) involved in some of the continental magmatism with geochemistry ascribed to mantle metasomatism.

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Additional Information:© 1982 Springer-Verlag. Received February 23, 1982; Accepted May 25, 1982. This research was supported by the Earth Sciences Section of the National Science Foundation, NSF Grant EAR 76-20413 and NSF Grant EAR 81-08626.
Funding AgencyGrant Number
NSFEAR 76-20413
NSFEAR 81-08626
Issue or Number:4
Record Number:CaltechAUTHORS:20160211-142932486
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64433
Deposited By: Tony Diaz
Deposited On:19 Feb 2016 22:18
Last Modified:10 Nov 2021 23:30

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