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Calibration of Al/Si order variations in anorthite

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Abstract

New single crystal diffraction data for natural and heat-treated anorthite crystals (Angel et al. 1990) allow the determination of their states of Al/Si order in terms of a macroscopic order parameter,Q OD , for the

transition. Numerical values ofQ OD obtained from estimates of site occupancies are shown to vary with the scalar spontaneous strain, ε s , as ε s ∝Q 2 OD , and with the ratio of the sums of typeb (superlattice) reflections and typea (sublattice) reflections asΣI b/ΣI a ∝Q 2 OD . An empirical calibration for pure anorthite is obtained giving\(Q_{OD} = 10.1\left( 5 \right)\sqrt {\varepsilon _s } \) varies between ∼ 0.92 and ∼ 0.87 in samples equilibrated at T≤1300° C, but then falls off relatively rapidly with increasing temperature, reaching ∼ 0.7 near the melting point (∼ 1557° C). The observed temperature dependence does not conform to the predictions of the simplest single order parameter models; coupling ofQ OD withQ of the

transition is suspeeted.

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Authors and Affiliations

  1. Department of Earth Sciences, University of Cambridge, Downing Street, CB2 3EQ, Cambridge, England

    M. A. Carpenter

  2. Department of Geological Sciences, University College London, Gower Street, WC1E 6BT, London, England

    R. J. Angel

  3. Department of Crystallography, Birkbeck College, Malet Street, WC1E 7HX, London, England

    L. W. Finger

  4. Geophysical Laboratory, 2801 Upton Street, NW, 20008, Washington DC, USA

    R. J. Angel

Authors
  1. M. A. Carpenter
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  2. R. J. Angel
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  3. L. W. Finger
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Carpenter, M.A., Angel, R.J. & Finger, L.W. Calibration of Al/Si order variations in anorthite. Contr. Mineral. and Petrol. 104, 471–480 (1990). https://doi.org/10.1007/BF01575624

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