An experimental study of the Fe-Mn exchange between garnet and ilmenite

Article Abstract:

An experiment was conducted to analyze the iron-manganese exchange of garnet and ilmenite and to reverse equilibrium over the range of the exchange system. Electron microprobe technique was utilized to characterize reactants and products of the iron-exchange process. Results showed that phases of ilmenite grains and adjacent garnet were unzoned and artificial titanium-zoning in garnet could be seen in the garnet-ilmenite interface. Furthermore, secondary titanium-fluorescence of ilmenite resulted to high apparent titanium contents.

Usage, Electron microscopy, Ilmenite

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Phase relations between Ca3Fe(super 3+)(sub 2)Si3O12-Fe(super 2+)(sub 3)Fe(super 3+)(sub 2)Si3O12 garnet and CaFeSi2O6-Fe2Si2O6 pyroxene solid solutions

Article Abstract:

The stability of Ca-containing garnets on the join Ca3Fe(super 3+)(sub 2)Si3O12-Fe(super 2+)(sub 3)Fe(super 3+)(sub 2)Si3O12 (andradite - 'skiagite') depends on the pressure at 1100 degree centigrade. In andradite the solubility of skiagite rises from 12 mol% at 1.7 GPa to 48 and 64 mol% at 6.0 and 7.0 GPa respectively. At 1100 degree centigrade synchronous existence of the equilibrium garnet solid solutions with spinel + clinopyroxene + quartz is observed. The pyroxenes have less Ca and are monoclinic above the pressure 7.0 GPa.

Observations, Pyroxene

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Experimental tests of garnet peridotite oxygen barometry

Article Abstract:

The oxygen barometer is exclusively used for garnet peridotite as suggested by the dependency of the oxidation state of Fe in mantle garnets on the oxygen fugacity. The oxygen fugacity is measured by two Pt-Fe sensors at the interface between a layer of garnet and a mixed olivine-orthopyroxene layer. A thin layer of garnet placed between layers of olivine and orthopyroxene is equilibrated at 1300 degree centigrade.

Research, Barometer, Barometers

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