An experimental study of Ca-(Fe,Mg) interdiffusion in silicate garnets
Article Abstract:
Ca-(Fe,Mg) were found to interdiffuse in grossular and almandine single crystals at temperatures of 900-1100 deg Celcius and 30kbar, and pressures of 15.0-32.5 kbar at 1000 deg Celcius. Experiments with the compound needed to be buffered by Fe/FeO. Although the hypothesis that Ca can enhance diffusion rates when used to structurally distort almandine is generally false, actual exchange process critically depends on crystal quality, including Fe3+ content, which results in vacancy concentration that can be used for other case experiments.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
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Preiswerkite and Na-(Mg,Fe)-margarite in eclogites
Article Abstract:
The petrology of the occurrences in La Compointrie, France and Liset, Norway was studied. Preiswerkite and Na-(Mg,Fe)-margarite are two micas that are very rarely found in nature but were observed in the two occurrences as retrogression products in symplectites or coronae around kyanite. Their physical and chemical properties were observed as well as the conditions of their stability which may provide a better understanding of their genesis.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
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