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An experimental study of Sr, Ba and Rb partitioning between alkali feldspar and silicate liquid in the system nepheline–kalsilite–quartz at 0.1 GPa P(H2O): a revisitation and reassessment

Published online by Cambridge University Press:  05 July 2018

C. M. B. Henderson  and
W. J. Pierozynski
C. M. B. Henderson*
Affiliation:
School of Earth, Atmospheric and Environmental Sciences (SEAES), University of Manchester, Manchester M13 9PL, UK Accelerator Science and Technology Centre (ASTeC), STFC Laboratory, Daresbury WA4 4AD, UK
W. J. Pierozynski
Affiliation:
School of Earth, Atmospheric and Environmental Sciences (SEAES), University of Manchester, Manchester M13 9PL, UK
*
*E-mail: michael.henderson@manchester.ac.uk
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Abstract

The partitioning of Sr, Ba and Rb between alkali feldspar and melt has been determined at 0.1 GPa water vapour pressure, mainly on one Na-rich series and one K-rich series within the system nepheline-kalsilite-quartz. Experiments were also carried out with small amounts of the anorthite molecule or peralkaline components (Na, K metasilicates). The compositions of the alkali feldspars and coexisting quenched glasses were determined by electron microprobe analysis. Except for some peralkaline compositions, the crystal/liquid partition coefficients for Sr and Ba are always >1; the crystal/liquid partition coefficient for Rb is always <1. For sodic alkali feldspars DSr > DBa and for potassic feldspars DSr < DBa. Partition coefficients for Sr and Ba increase: (1) with decreasing temperature; (2) with increasing Or content of feldspar; (3) with increasing silica-undersaturation of the melt; (4) with decreasing peralkalinity. The variation in the value of DRb is less clear, but it is higher for K-rich feldspars. Multiple linear regression equations are fitted to correlate ln(D) with independent compositional and physical variables. Where rock/groundmass major-element data are available for felsic natural rocks, equations are recommended for obtaining reliable alkali feldspar partition coefficients for modelling fractional crystallization processes. The structural properties of silicate melts and crystal chemical relations are used to rationalize trends in partition coefficients.

Keywords

SrBaRb in alkali feldsparscrystal – melt partition coefficientsequations for predicting partition coefficients in felsic systems
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 1 , February 2012 , pp. 157 - 190
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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