Contributions to Mineralogy and Petrology

, Volume 164, Issue 2, pp 341–358 | Cite as

Experimental Na/K exchange between alkali feldspar and an NaCl–KCl salt melt: chemically induced fracturing and element partitioning

  • G. Neusser
  • R. Abart
  • F. D. Fischer
  • D. Harlov
  • N. Norberg
Original Paper

Abstract

The exchange of Na+ and K+ between alkali feldspar and a NaCl–KCl salt melt has been investigated experimentally. Run conditions were at ambient pressure and 850 °C as well as 1,000 °C. Cation exchange occurred by interdiffusion of Na+ and K+ on the feldspar sub-lattice, while the Si–Al framework remained unaffected. Due to the compositional dependence of the lattice parameters compositional heterogeneities resulting from Na+/K+ interdiffusion induced coherency stress and associated fracturing. Depending on the sense of chemical shift, different crack patterns developed. For the geometrically most regular case that developed when potassic alkali feldspar was shifted toward more sodium-rich compositions, a prominent set of cracks corresponding to tension cracks opened perpendicular to the direction of maximum tensile stress and did not follow any of the feldspar cleavage planes. The critical stress needed to initiate fracturing in a general direction of the feldspar lattice was estimated at ≤0.35 GPa. Fracturing provided fast pathways for penetration of salt melt or vapor into grain interiors enhancing overall cation exchange. The Na/K partitioning between feldspar and the salt melt attained equilibrium values in the exchanged portions of the grains allowing for extraction of the alkali feldspar mixing properties.

Keywords

Alkali feldspar Cation exchange Chemically induced fracturing Element partitioning 

Supplementary material

410_2012_741_MOESM1_ESM.pdf (34 kb)
PDF (34 KB)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • G. Neusser
    • 1
  • R. Abart
    • 2
  • F. D. Fischer
    • 3
  • D. Harlov
    • 4
  • N. Norberg
    • 4
  1. 1.Institute of Geological SciencesFree University BerlinBerlinGermany
  2. 2.Department of Lithospheric ResearchUniversity of ViennaViennaAustria
  3. 3.Institute of MechanicsMontanuniversität LeobenLeobenAustria
  4. 4.Helmholtzzentrum PotsdamDeutsches GeoForschungsZentrumPotsdamGermany

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