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Table 5 Chemical compositions of phases in run products

From: Melting phase relations in the MgSiO3–CaSiO3 system at 24 GPa

Run no. SMa Phaseb MgO CaO SiO2 Total (wt.%) Mg Ca Si ∑Cationc Mg/(Mg + Ca)
OS3097 Mg90 S-Bdg (48) 37.56(101) 3.07(121) 62.12(76) 102.74(112) 0.915(19) 0.054(21) 1.016(4) 1.984(4) 0.945(22)
  Mg75 S-Bdg (32) 36.45(93) 3.35(86) 61.46(72) 101.25(130) 0.901(16) 0.060(15) 1.020(4) 1.980(4) 0.938(16)
OS3099 Mg90 Melt (9) 33.57(42) 8.49(28) 57.33(86) 99.39(86) 0.864(12) 0.157(6) 0.990(6) 2.010(6) 0.846(5)
   L-Bdg (44) 38.25(106) 2.12(79) 61.04(100) 101.42(171) 0.943(15) 0.038(14) 1.010(3) 1.990(3) 0.962(14)
   S-Bdg (34) 38.26(100) 1.99(60) 60.84(106) 101.09(181) 0.946(13) 0.035(11) 1.009(4) 1.991(4) 0.964(11)
   S-CaPv (28) 4.89(63) 40.58(67) 52.85(67) 98.32(85) 0.140(18) 0.834(17) 1.013(5) 1.987(5) 0.143(17)
  Mg75 L-CaPv (29) 5.34(75) 40.30(83) 52.72(84) 98.36(97) 0.153(22) 0.827(17) 1.010(8) 1.990(8) 0.155(21)
   S-CaPv (33) 5.68(57) 39.90(78) 52.97(64) 98.55(87) 0.161(16) 0.816(16) 1.011(7) 1.989(7) 0.165(16)
   S-Bdg (44) 39.05(66) 1.80(31) 61.89(74) 102.74(121) 0.949(8) 0.031(6) 1.010(3) 1.990(3) 0.968(6)
OS3095 Mg90 Melt (13) 35.49(38) 5.29(13) 58.47(44) 99.24(84) 0.904(4) 0.097(2) 0.999(2) 2.000(2) 0.903(2)
  Mg75 Melt (15) 31.47(46) 10.35(16) 57.63(57) 99.46(112) 0.812(4) 0.192(2) 0.998(2) 2.002(2) 0.809(2)
   L-CaPv (31) 4.39(36) 42.59(58) 53.01(65) 100.00(81) 0.124(10) 0.865(13) 1.005(4) 1.995(4) 0.125(10)
OS3150 Mg50 Melt (21) 28.27(72) 14.57(90) 56.85(40) 99.70(67) 0.737(16) 0.273(18) 0.995(2) 2.005(2) 0.730(17)
   L-CaPv (37) 3.42(43) 43.32(59) 53.52(31) 100.25(48) 0.096(12) 0.878(13) 1.013(3) 1.987(3) 0.099(12)
  1. SM starting material, S- subsolidus, L- liquidus, Bdg bridgmanite, CaPv CaSiO3-rich perovskite
  2. aSee Table 1 for details
  3. bNumber of electron microprobe analyses is shown in parentheses
  4. cNumber of oxygen is 3