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Temperature derivatives of elastic wave velocities in plagioclase (An_51±1) above and below the order-disorder transition temperature

¹ Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama 2408501, Japan
² Department of Geology and Mineralogy, Kyoto University, Kyoto 6068502, Japan

View larger version (19K): [in this window] [in a new window]   FIGURE 1. (a) Schematic illustration of the cell assembly and electrical circuit used for vp and vs measurements. (b) An example of P- and S-wave signals reflected at the lower (R1) and upper (R2) ends of the sample.

View larger version (51K): [in this window] [in a new window]   FIGURE 2. Crossed-polars photomicrograph of the initial polycrystalline plagioclase sample.

View larger version (25K): [in this window] [in a new window]   FIGURE 3. Variations in vp (a, d, g, j), vs (b, e, h, k), and Poisson’s ratio (c, f, i, l) as a function of temperature in the first (a–c), second (d–f), third (g–i), and fourth (j–l) cycles of Run LPS9. The solid and open symbols represent the data in the heating and cooling runs, respectively. The lines in the graphs represent the first heating and cooling and second heating cycles (dashed line), second cooling and third heating cycles (thin broken line), and third cooling and fourth heating and cooling cycles (dotted line). The vp/T and vs/T values for each of these lines are shown in Table 4.

View larger version (10K): [in this window] [in a new window]   FIGURE 4. vp (a), vs (b), and Poisson’s ratio (c) of Run LPS7 up to 700 °C at 1 GPa for each of the three heating and cooling cycles.

View larger version (18K): [in this window] [in a new window]   FIGURE 5. Lattice angle as a function of anorthite content. The solid lines represent previously observed values for low and high plagioclases. The broken lines show the t1O – <t1m> values estimated from lattice angle .

View larger version (21K): [in this window] [in a new window]   FIGURE 6. Average aluminum contents of the T1O (t1O) site and T1m, T2O, and T2m sites (<t1m>). The solid lines represent aluminum contents of low and high plagioclase (Kroll and Ribbe 1980).