K2O-Al2O3-SiO2
All of the experimental results in this subsystem are in good agreement with the thermodynamic data. The potassium feldspars are treated in terms of a simple first order phase transition between microcline and sanidine at 452°C, a simplification based on the results of the analysis of Carpenter & Salje (1994b).
195) mic = san (Carpenter et al., 1994)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 - 0.0 445 460 10.05 10.26 452 16 1 (10.06 <-> 10.25)
cH = 10.16 (sd 0.11)
within bracket
uH = 0.07, d/s = 1.5, h = 1.00
196) mu = san + cor + H2O (Chatterjee & Johannes, 1974)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 1.0 600 630 102.69 105.23 -5 595 4 3 (102.42 <-> 103.32)
0 0 2.0 640 660 102.83 104.34 -8 632 4 cH = 102.22 (sd 0.17)
0 0 4.0 690 710 102.21 103.59 690 6 too low but OK
0 0 6.0 740 750 102.18 102.83 741 6 uH = 0.38, d/s = 0.0, h = 0.34
0 0 8.0 780 800 101.74 102.98 788 6
197) mu + q = san + and + H2O (Chatterjee & Johannes, 1974)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 0.5 520 560 97.73 101.54 539 4 3 (98.47 <-> 99.36)
0 0 1.0 550 570 97.96 99.61 569 4 cH = 99.52 (sd 0.17)
0 0 2.0 590 605 98.17 99.28 3 608 4 too high but OK
0 0 3.0 620 640 97.96 99.37 2 642 4 uH = 0.38, d/s = 0.9, h = 0.42
0 0 4.0 660 670 98.59 99.27 4 674 6
0 0 5.0 690 705 98.60 99.57 704 6
198) mu + q = san + sill + H2O (Chatterjee & Johannes, 1974)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 0.5 540 580 102.00 105.90 544 4 3 (101.87 <-> 102.91)
0 0 2.0 595 630 101.33 104.01 609 4 cH = 102.40 (sd 0.17)
0 0 3.0 630 660 101.74 103.92 639 4 within bracket
0 0 5.0 680 705 101.55 103.25 692 6 uH = 0.44, d/s = 0.7, h = 0.24
0 0 6.0 710 720 101.91 102.57 717 6
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