Table T5. Composition of volcanic glass and palagonite.
Core, section,
interval (cm)
Point
Phase
Type
Major element oxide (wt%)
SiO2
TiO2
Al2O3
Cr2O3
FeO
MnO
MgO
CaO
Na2O
K2O
P2O5
Cl
Total
200-1224A-
4X-1, 16–19 1-1 Black glass S 50.76 1.64 13.17 0.00 10.36 0.17 9.25 10.84 2.46 0.06 0.13 0.00 98.83
200-1224E-
3R-1, 6–10 2-3 Brown glass G 49.55 2.81 12.55 0.10 14.16 0.30 5.39 9.79 2.90 0.17 0.22 0.07 98.00

2-4 Palagonite P 46.77 3.53 9.43 0.01 23.75 0.02 3.18 1.03 0.62 3.91 0.00 0.15 92.40

1-1 Brown glass G 49.43 2.82 12.87 0.07 14.17 0.30 5.32 9.86 2.88 0.18 0.18 0.09 98.16
200-1224F-
4R-6, 11–13 1-2 Fresh glass in pillow G 49.75 2.16 13.58
12.22 0.18 6.49 10.89 2.75 0.13 0.20 0.06 98.41

1-3 Fresh glass in pillow S 51.04 2.19 13.83
13.11 0.30 6.05 10.51 0.29 0.15 0.18 0.03 97.67

1-5 Fresh glass in pillow G 49.79 2.13 13.59 0.01 12.12 0.28 6.60 10.80 2.79 0.15 0.22 0.06 98.53

2-5 Black glass in pillow S 48.69 2.31 14.04 0.01 13.79 0.19 5.41 10.90 2.95 0.20 0.16 0.04 98.71
6R-1, 29–34 1-2 Brown glass pillow G 49.60 2.00 13.46 0.03 12.25 0.30 6.54 10.73 2.67 0.13 0.13 0.01 97.86

1-3 Orange glass pillow P 46.95 2.82 13.11 0.01 18.98 0.03 3.31 0.52 2.14 3.55 0.05 0.26 91.73

1-4 Reddish glass pillow P 47.94 2.76 10.67 0.02 21.12 0.01 3.92 0.63 0.86 3.65 0.07 0.20 91.86

2-1 Clear glass pillow P 49.58 3.10 9.27 0.04 19.72
4.84 0.67 0.28 4.28 0.01 0.02 91.80

4-3 Glass near pl in pillow S 50.36 2.14 13.75 0.01 12.99 0.24 6.07 10.50 1.49 0.11 0.16 0.01 97.83

4-5 Glass in pillow S 49.94 2.13 13.60 0.02 11.97 0.34 6.65 10.82 2.81 0.14 0.18 0.05 98.67
11R-2, 13–15 1-3 Glass S 49.45 2.25 12.41 0.08 13.70 0.35 7.22 11.09 2.52 0.13 0.21 0.05 99.45

2-2 Brown glass G 49.66 2.59 13.00 0.06 13.40 0.20 5.71 10.07 2.86 0.19 0.23 0.08 98.04

2-3 Palagonite P 40.35 3.80 8.75 0.03 20.25 0.02 1.33 1.01 6.55 2.41 0.04 0.06 84.61

3-2 Yellow glass P 46.56 3.39 8.69 0.02 21.92 0.00 3.30 0.92 1.70 3.71 0.04 0.15 90.41

4-2 Brown glass G 49.96 2.42 13.14 0.06 13.22 0.26 5.62 10.17 3.00 0.19 0.33 0.02 98.40

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. G = glass, P = palagonite, S = dark spherulitic glass.