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Conditions for melting and metasomatism in the Earth's mantle

Wyllie, Peter J. (1985) Conditions for melting and metasomatism in the Earth's mantle. Geologica Carpathica, 36 (3). pp. 323-335. ISSN 1336-8052.

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If we know the compositions of mantle rocks at various depths, and the geotherm in different tectonic environments, then the conditions for melting are defined by experimentally determined solidus curves. The term “metasomatism" in crustal processes is defined as reaction by solution or vapors, not by melts or magmas, and the same definition should apply to mantle processes (reaction with magmas is "hybridizatian"). H_2O, CO_2, or both are made available for metasomalic reaction at deep dissociation fronts, or by solidificatfon of volatile-charged magmas. Regions eligible for metasomatism are limited by solidus curves above which the melts dissolve volatile components. Beneath the lithosphere, there can be no metasomatism between about 120 and 260 km, because melting intervenes. Solidification of kimberlitic magmas at the base of continental lithosphere is a source of metasomatic fluids. Mantle metasomatism is expected in several regions above subducted oceanic lithosphere, interspersed with magmatic events. Major differentiation of the Earth is accomplished by melting, but metasomatism may cause significant redistribution of some elements.

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Alternate Title:Conditions de fusion et de métasomatisme dans le manteau terrestre
Additional Information:© 1985 De Gruyter. Manuscript received November 17, 1984. This research was supported by the Earth Sciences Section of the National Science Foundation, Gr ants EAR-8311758 and EAR-8341623.
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Issue or Number:3
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64425
Deposited By: Tony Diaz
Deposited On:19 Feb 2016 19:23
Last Modified:03 Oct 2019 09:37

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