6533b821fe1ef96bd127b6df
RESEARCH PRODUCT
?Short Distance?-Variabilit�t der Na-Gehalte niedrigmetamorpher mit Albit ber�hrungsparagenetisch koexistierender Hellglimmer
H. J. Tobschallsubject
Microprobegeographygeography.geographical_feature_categoryThin sectionClinozoisiteSchistMineralogyMassifAlbitechemistry.chemical_compoundGeophysicschemistryGeochemistry and PetrologyQuartzChloriteGeologydescription
White micas coexisting with albite, quartz, chlorite, and clinozoisite in low-grade schists of the Beaume Valley (Massif Central, France) have been analyzed by standard microprobe techniques. As the micas of an albite-rich thin section show significantly higher Na-contents than those of an albite-poor one of the same rock sample, the application of the muscovite-albite-geothermometer results in inconsistent temperature values. Thus the analyses may indicate that the distribution of sodium between coexisting white micas and albite not only depends on temperature and pressure but also on the chemical potentials of the alkalies in the metamorphic fluid phase.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1973-01-01 | Contributions to Mineralogy and Petrology |