Primary spinel + chlorite inclusions in mantle garnet formed at ultrahigh-pressure Journal Article uri icon

DCO ID 11121/6259-7758-5689-6955-CC

is Contribution to the DCO

  • YES

year of publication

  • 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.

volume

  • 4