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.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Crustal structure of the central sector of the Betic Cordillera (SE Spain). The role of extension in the Miocene denudation of the Nevado-Filabride Complex, Betic Cordillera (SE Spain)
- Abstracts: Experimental determination of partition coefficients for rare earth and high-field-strength elements between clinopyroxene, garnet, and basaltic melt at high pressures
- Abstracts: Permian paleomagnetism of the northern Tien Shan and its tectonic implications. Paleomagnetism and geochronology of the Late Cretaceous-Paleogene island arc complex of the Kronotsky Peninsula, Kamchatka, Russia: Kinematic implications
- Abstracts: Contrasting stable isotope behavior between calcite and dolomite marbles, Lone Mountain, Nevada. Comments "On the Kinetics of Textural Equilibration in Forsterite Marbles" by M.B. Holmes, M.J. Bickle, and C.M. Graham
- Abstracts: The U.S. government response to global change: analysis and appraisal. On writing good histories of climate change and testing social science theories