Na2O-Al2O3-SiO2
The only new end-member in this subsystem is analcite, and its enthalpy was retrieved from the experiments of Manghnani (1970) on the reaction jd + H2O = anl, and the brackets of Thompson (1971) and Liou (1971c) on the reaction anl + q = abh + H2O. The entropy of high albite has been raised by adding 2 J/mol onto the simple tricritical Landau model for albite disordering. An error in the molar volume for nepheline in HP90 led to an unreasonable enthalpy of formation; correction of this error now leads to a derived enthalpy which agrees well with the high-temperature calorimetry of Navrotsky et al. (1980)
185) jd + q = abh (Holland, 1980)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 - 16.5 16.0 600 13.21 14.04 16.11 0.33 3 (13.18 <-> 15.01)
0 - 22.0 21.0 800 13.24 14.87 21.61 0.34 cH = 13.87 (sd 0.28)
0 - 25.0 23.5 900 12.84 15.26 24.36 0.34 within bracket
0 - 27.5 26.0 1000 13.22 15.61 27.09 0.34 uH = 0.77, d/s = 0.3, h = 0.40
0 - 30.0 29.0 1100 13.58 15.15 29.82 0.35
0 - 33.0 31.0 1200 13.13 16.24 32.52 0.35
186) jd + q = ab (Newton & Smith, 1967; Holland, 1980)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 - 15.2 13.5 500 2.67 5.42 14.31 0.35 3 (3.52 <-> 5.32)
0 - 15.7 14.9 550 3.77 5.07 15.49 0.35 cH = 4.11 (sd 0.28) 2
0 - 16.9 16.2 600 3.77 4.90 16.69 0.35 within bracket
0 - 22.0 21.0 800 3.59 5.20 21.68 0.36 uH = 0.76, d/s = 0.7, h = 0.14
0 - 25.0 23.5 900 3.08 5.50 24.36 0.36
0 - 27.5 26.0 1000 3.46 5.85 27.09 0.37
0 - 30.0 29.0 1100 3.81 5.39 29.81 0.37
0 - 33.0 31.0 1200 3.36 6.47 32.51 0.37
187) jd + ky = abh + cor (Essene et al., 1972)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 - 19.5 18.5 800 19.18 21.24 18.65 0.28 2 (19.77 <-> 22.11)
0 - 29.3 28.3 1200 20.64 22.61 29.15 0.29 cH = 20.93 (sd 0.28) 2
within bracket
uH = 1.00, d/s = 0.3, h = 0.02
188) 2jd = ne + abh (Gasparik, 1985; Robertson et al., 1957; Boettcher & Wyllie, 1968)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 - 11.0 10.0 600 32.87 36.30 10.14 0.54 3 (34.04 <-> 37.32)
0 - 15.0 14.0 800 35.16 38.55 14.81 0.55 cH = 35.81 (sd 0.92)
0 - 18.3 15.4 825 26.02 35.77 -0.01 15.39 0.55 within bracket
0 - 19.5 18.0 950 31.72 36.75 18.28 0.55 uH = 1.37, d/s = 0.0, h = 0.97
0 - 21.0 1050 34.40 1069 24
0 - 20.0 1100 41.55 1025 24
0 - 24.0 23.0 1200 35.76 39.08 23.99 0.56
189) pa = jd + ky + H2O (Holland, 1979)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 24.0 26.0 550 81.73 83.83 25.74 0.56 3 (83.07 <-> 84.33)
0 0 24.0 25.5 600 82.65 84.23 24.86 0.56 cH = 83.56 (sd 0.29)
0 0 24.0 25.0 650 83.54 84.59 24.02 0.56 within bracket
0 0 23.0 24.5 700 83.35 84.92 23.21 0.56 uH = 0.53, d/s = 0.3, h = 0.51
190) pa = abh + cor + H2O (Chatterjee, 1970)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 1.0 530 550 104.93 106.84 -5 525 4 3 (104.95 <-> 106.11)
0 0 2.0 555 575 104.73 106.49 -3 552 4 cH = 104.49 (sd 0.20)
0 0 3.0 580 600 104.88 106.56 -5 575 4 too low
0 0 5.0 625 640 105.16 106.37 -8 617 6 uH = 0.43, d/s = 0.5, h = 0.36
0 0 6.0 620 650 103.25 105.61 636 6
0 0 7.0 650 670 104.17 105.72 654 6
191) pa + q = abh + and + H2O (Chatterjee, 1972)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 1.0 470 490 98.90 100.74 11 501 4 3 (100.25 <-> 101.31)
0 0 2.0 510 530 100.02 101.76 530 4 cH = 101.79 (sd 0.20)
0 0 3.0 540 560 100.41 102.08 557 4 too high
0 0 4.0 560 580 100.07 101.70 1 581 4 uH = 0.45, d/s = 0.1, h = 0.36
0 0 5.0 590 600 100.61 101.41 5 605 6
192) pa + q = abh + ky + H2O (Chatterjee, 1972)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 5.0 570 625 94.95 98.82 605 6 1 (96.53 <-> 97.69)
0 0 6.0 600 630 96.02 98.10 620 6 cH = 97.43 (sd 0.20)
0 0 7.0 620 640 96.43 97.79 635 6 within bracket
uH = 0.36, d/s = 1.9, h = 0.15
193) jd + H2O = anl (Manghnani, 1970)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 11.0 6.4 350 -48.73 -40.16 6.46 0.38 1 (-41.38 <-> -40.28)
0 0 9.0 7.5 450 -42.29 -39.60 7.87 0.38 cH = -40.26 (sd 0.34) 2
0 0 9.5 8.0 500 -41.95 -39.30 8.55 0.39 too high but OK
0 0 10.0 8.0 550 -41.50 -38.02 9.30 0.39 uH = 0.32, d/s = 2.1, h = 0.06
0 0 11.0 9.0 575 -42.54 -39.05 9.70 0.39
194) anl + q = abh + H2O (Thompson, 1971; Liou, 1971)
ln_K x(CO2) P(kbar) T(C) H(low) H(high) miss calc 2sd summary
0 0 2.0 180 200 53.81 54.39 191 4 3 (53.93 <-> 54.30)
0 0 4.0 160 180 53.50 53.99 4 184 4 cH = 54.13 (sd 0.21) 2
0 0 3.0 190 205 54.15 54.57 -1 189 4 within bracket
0 0 4.0 175 195 53.86 54.39 185 4 uH = 0.13, d/s = -0.6, h = 0.98
0 0 5.0 175 190 54.02 54.40 179 4
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