Table T4. Composition of opaque minerals.
Core, section,
interval (cm)
Point
Phase
Major element oxide (wt%)
Trace element (ppm)
Ilm
Usp
Mg#
SiO2
TiO2
Al2O3
Cr2O3
FeO
MnO
MgO
Total
Ti
Al
Fe3+
Fe2+
Mn
Mg
Cr
Total
200-1224D-
3R-1, 50–53 1-3 Octahedral solid solution groundmass 0.41 22.96 1.67 0.15 70.57 0.50 1.02 97.29 0.7002 0.0800 0.6320 1.5724 0.0172 0.0615 0.0049 3.0682
0.69 0.04

2-2 Octahedral solid solution skeletal 0.28 24.57 1.65 0.00 71.19 0.46 0.99 99.14 0.7297 0.0768 0.5740 1.6088 0.0153 0.0585 0.0000 3.0632
0.72 0.03

4-1 Octahedral solid solution microphenocryst core 0.35 24.77 1.49
69.99 0.56 0.84 98.00 0.7440 0.0703 0.5486 1.6287 0.0188 0.0502 0.0000 3.0606
0.73 0.03

4-2 Octahedral solid solution same microphenocryst rim 0.60 23.31 1.89
69.98 0.79 0.63 97.19 0.7117 0.0903 0.5999 1.5981 0.0272 0.0379 0.0000 3.0650
0.70 0.02
4R-1, 74–77 1-4 Octahedral solid solution groundmass 0.39 25.11 1.84 0.02 67.20 0.69 0.15 95.39 0.7703 0.0885 0.4650 1.6946 0.0238 0.0091 0.0006 3.0519
0.77 0.01
200-1224F-
1R-4, 115–117 1-1 Octahedral solid solution groundmass 0.38 23.61 0.97 0.08 70.69 0.73 0.31 96.77 0.7283 0.0469 0.6084 1.6321 0.0254 0.0187 0.0027 3.0625
0.71 0.01

1-5 Octahedral solid solution groundmass 0.42 27.80 1.15 0.07 65.30 0.58 0.44 95.76 0.8389 0.0543 0.3392 1.7593 0.0196 0.0264 0.0023 3.0399
0.83 0.01

1-7 Octahedral solid solution groundmass skeletal 0.57 24.32 1.48
69.05 0.65 0.37 96.44 0.7462 0.0712 0.5423 1.6537 0.0225 0.0225 0.0000 3.0585
0.73 0.01
200-1224D-
3R-1, 14–16 1-1 Octahedral solid solution microphenocryst core 0.30 23.00 1.43 0.09 71.50 0.51 0.66 97.49 0.7027 0.0685 0.6416 1.5932 0.0177 0.0401 0.0028 3.0667
0.69 0.02

1-2 Octahedral solid solution same microphenocryst rim 0.42 22.42 1.11 0.06 71.07 0.68 0.62 96.39 0.6975 0.0539 0.6708 1.5820 0.0239 0.0384 0.0019 3.0684
0.68 0.02

2-4 Rhombohedral solid solution groundmass 0.36 50.31

46.98 0.65 0.97 99.27 0.9705 0.0000 0.0873 0.9058 0.0140 0.0372 0.0000 2.0149 0.96
0.04

2-5 Rhombohedral solid solution groundmass 0.90 48.13 0.13 0.00 46.88 0.58 0.57 97.19 0.9595 0.0041 0.1131 0.9067 0.0130 0.0224 0.0000 2.0188 0.94
0.02

2-6 Rhombohedral solid solution groundmass 0.30 49.98 0.01 0.06 47.57 0.59 0.77 99.28 0.9663 0.0003 0.0972 0.9090 0.0128 0.0295 0.0012 2.0164 0.95
0.03
200-1224F-
3R-3, 90–92 1-5 Octahedral solid solution groundmass 1.07 28.35 1.15 0.05 57.50 0.57 0.19 88.88 0.9113 0.0579 0.1541 1.8615 0.0207 0.0122 0.0016 3.0193
0.92 0.01

1-9 Octahedral solid solution groundmass 1.39 28.82 1.60 0.07 58.52 0.71 0.22 91.33 0.9020 0.0785 0.1508 1.8473 0.0249 0.0135 0.0023 3.0192
0.92 0.01
6R-1, 105–107 1-1 Octahedral solid solution groundmass 0.69 25.27 1.77 0.06 61.93 0.37 0.55 90.65 0.8075 0.0889 0.3739 1.7239 0.0133 0.0348 0.0020 3.0442
0.81 0.02

1-6 Octahedral solid solution groundmass 1.37 25.26 2.11 0.03 61.09 0.62 0.70 91.18 0.8049 0.1053 0.3614 1.7055 0.0221 0.0440 0.0011 3.0441
0.82 0.02
13R-1, 22–24 1-3 Octahedral solid solution groundmass 0.48 24.97 2.00 0.11 62.46 0.57 0.70 91.30 0.7908 0.0993 0.3994 1.6902 0.0203 0.0441 0.0038 3.0478
0.80 0.03

1-4 Octahedral solid solution groundmass 1.09 26.89 2.26 0.10 59.59 0.52 0.72 91.18 0.8433 0.1113 0.2565 1.7553 0.0185 0.0445 0.0034 3.0327
0.87 0.02
15R-1, 88–90 1-2 Octahedral solid solution microphenocryst 0.41 23.55 2.11 0.02 70.20 0.53 0.85 97.66 0.7112 0.0997 0.5893 1.5951 0.0181 0.0507 0.0008 3.0649
0.71 0.03

3-2 Octahedral solid solution groundmass 0.31 22.28 2.05 0.06 71.17 0.57 0.18 96.62 0.6875 0.0989 0.6426 1.6037 0.0198 0.0112 0.0020 3.0658
0.68 0.01

Notes: In the Point column, the first number indicates the number of the circle drawn on the thin section, and the second number indicates the sequential number of analyses in that circle. Ilm = ilemnite, Usp = ulvöspinel.