Contributions to Mineralogy and Petrology

, Volume 153, Issue 2, pp 237–250 | Cite as

Diffusion-controlled development of silica-undersaturated domains in felsic granulites of the Bohemian Massif (Variscan belt of Central Europe)

  • Lucie Tajčmanová
  • Jiří Konopásek
  • James A. D. Connolly
Original Paper


Plagioclase rims around metastable kyanite crystals appear during decompression of high-pressure felsic granulites from the high-grade internal zone of the Bohemian Massif (Variscan belt of Central Europe). The development of the plagioclase corona is a manifestation of diffusion-driven transfer of CaO and Na2O from the surrounding matrix and results in isolation of kyanite grains from the quartz- and K-feldspar-bearing matrix. This process establishes Si-undersaturated conditions along the plagioclase–kyanite interface, which allow crystallization of spinel during low-pressure metamorphism. The process of the plagioclase rim development is modeled thermodynamically assuming local equilibrium. The results combined with textural observations enable estimation of equilibration volume and diffusion length for Na and Ca that extends ∼400–450 and ∼450–550 μm, respectively, around each kyanite crystal. Low estimated bulk diffusion coefficients suggest that the diffusion rate of Ca and Na is controlled by low diffusivity of Al across the plagioclase rim.


Equilibration volume Coronal structures Diffusion Low-pressure granulites Perple_X Bohemian Massif 



This work was financially supported by Charles University Grant Agency (GAUK no. 333/2004/ B-GEO/PrF) and by Project of the Czech Geological Survey and Ministry of Environment (No. 6352). We gratefully acknowledge R. Čopjaková, R.Škoda from Masaryk University in Brno and R. Procházka from Charles University in Prague for operating the microprobe. J. Košler is acknowledged for the ICP-MS measurements. Two anonymous reviewers are thanked for their constructive reviews and T. L. Grove is gratefully thanked for his careful editorial work.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Lucie Tajčmanová
    • 1
    • 2
  • Jiří Konopásek
    • 1
    • 2
  • James A. D. Connolly
    • 3
  1. 1.Institute of Petrology and Structural GeologyCharles UniversityPragueCzech Republic
  2. 2.Czech Geological SurveyPraha 1Czech Republic
  3. 3.Institut für Mineralogie und PetrographieETH-ZentrumZürichSwitzerland

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