Multiphase inclusions represent microenvironments where the interaction between fluid and host mineral is preserved during the rock geological path. Under its peculiar chemical-physical constraints, the entrapped solute-rich fluid might follow a crystallisation mechanism which is not predictable through simple equilibrium arguments. In this letter, by the modelling of solid-solution equilibrium and the application of principles of mass conservation, we demonstrate that cavities in mantle garnet filled with slab-derived fluids can re-equilibrate to a pyrope + spinel + chlorite assemblage at the same high P-T of their formation. The basis of this occurrence is a dissolution-reprecipitation mechanism, triggered by a dilute, non-equilibrated slab fluid.

Campione, M., Tumiati, S., Malaspina, N. (2017). Primary spinel + chlorite inclusions in mantle garnet formed at ultrahigh-pressure. GEOCHEMICAL PERSPECTIVES LETTERS, 4, 19-23 [10.7185/geochemlet.1730].

Primary spinel + chlorite inclusions in mantle garnet formed at ultrahigh-pressure

Campione, M
;
Malaspina, N.
2017

Abstract

Multiphase inclusions represent microenvironments where the interaction between fluid and host mineral is preserved during the rock geological path. Under its peculiar chemical-physical constraints, the entrapped solute-rich fluid might follow a crystallisation mechanism which is not predictable through simple equilibrium arguments. In this letter, by the modelling of solid-solution equilibrium and the application of principles of mass conservation, we demonstrate that cavities in mantle garnet filled with slab-derived fluids can re-equilibrate to a pyrope + spinel + chlorite assemblage at the same high P-T of their formation. The basis of this occurrence is a dissolution-reprecipitation mechanism, triggered by a dilute, non-equilibrated slab fluid.
Articolo in rivista - Articolo scientifico
dissolution-reprecipitation, slab dehydration, supercritical liquid, solid-solution equilibrium, subduction zone, mantle peridotite
English
2017
4
19
23
reserved
Campione, M., Tumiati, S., Malaspina, N. (2017). Primary spinel + chlorite inclusions in mantle garnet formed at ultrahigh-pressure. GEOCHEMICAL PERSPECTIVES LETTERS, 4, 19-23 [10.7185/geochemlet.1730].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/165872
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