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27Al, 29Si, and 23Na MAS NMR study of an Al, Si ordered alkali feldspar solid solution series

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Abstract

Solid-state 27Al, 29Si and 23Na MAS NMR spectra have been obtained for an Al,Si ordered low albite to low microcline ion exchange series for which unit-cell parameters and 29Si NMR data have previously been reported. 27Al δi vary continuously with composition from 63.4 (±0.5) ppm for albite to 58.9 (±0.5) ppm for microcline, and parallel the 29Si chemical shifts assigned to the T2m-site. The 27Al and 29Si chemical shifts for this series correlate well with composition-dependent lattice parameters, most notably cell volume and the angle [201]1b. The linewidths of the 29Si and 27Al resonances indicate a significant amount of structural disorder in the intermediate compositions due to Na, K substitution. The 1 σ width of the distribution of average Si-O-T angles for each T-site is estimated to be about 1° for the Or33 sample. The average 23Na δi varies monotonically from -8.5 (±1) ppm for albite to -24.3 (±1)ppm for Or83. Similarly, the average 23Na nuclear quadrupole coupling constant decreases from 2.60 to 1.15 (±0.05) MHz and the asymmetry parameter of the electric field gradient increases from 0.25 to 0.6 with increasing K-content from albite to Or83. The observed variations in the quadrupole coupling parameters are consistent with simple electrostatic calculations. Higher resolution 23Na spectra of the intermediate compositions obtained at 11.7 T indicate the presence of an inhomogeneous linebroadening which is related to the distribution of Na-environments. A model based on a random distribution of local compositions does not simulate the spectra, suggesting that the distribution of Na is skewed toward Na-rich clusters. Observation of the 23Na NMR lineshape of Or49 after short periods of heat treatment indicate that 23Na NMR is very sensitive to the changes in the Na, K distribution accompanying the early stages of exsolution. Reversible changes occur after heating at 530° C for 3 h, whereas heating at 600° C produces no changes, possibly bracketing the position of the coherent spinodal for Al, Si ordered alkali feldspars at this composition.

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Authors and Affiliations

  1. Mineral Physics Program, Department of Geology, University of Illinois, 1301 W. Green St., 245 Natural History Building, 61801, Urbana, Illinois, USA

    Brian L. Phillips & R. James Kirkpatrick

  2. Department of Geology, Lafayette College, 18042, Easton, Pennsylvania, USA

    Guy L. Hovis

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  1. Brian L. Phillips
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  2. R. James Kirkpatrick
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  3. Guy L. Hovis
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Phillips, B.L., Kirkpatrick, R.J. & Hovis, G.L. 27Al, 29Si, and 23Na MAS NMR study of an Al, Si ordered alkali feldspar solid solution series. Phys Chem Minerals 16, 262–275 (1988). https://doi.org/10.1007/BF00220694

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