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Table T9. Whole-rock major and trace element compositions, Hole U1376A.

Hole:
330-U1376A-
Core, section:
5R-2 6R-6 7R-4 8R-6 10R-3 13R-4 14R-3 15R-2 16R-2 17R-3 19R-1 21R-4 23R-1
Piece:
5 5 6 8 2B 1 3 2* 1 17 16 3 8*
Interval (cm):
128–130 126–128 122–124 132–134 119–121 0–3 86–88 35–37 10–12 128–130 95–97 82–84 98–102
Top depth (mbsf):
40.65 55.63 62.75 74.86 86.22 104.73 109.3 112.35 116.82 129.38 145.35 158.61 174.18
Strat. unit:
IIB III III III III III III IV IV IV IV IV IV
Major element oxide (wt%):
SiO2 46.98 45.88 47.19 44.17 46.16 44.31 46.07 47.65 49.54 49.86 47.84 45.71 44.16
TiO2 2.63 2.24 2.65 2.21 2.49 2.14 2.46 2.77 2.76 3.37 3.12 1.91 2.84
Al2O3 14.13 11.45 12.38 10.46 12.48 10.02 11.64 13.37 13.95 15.41 14.42 8.65 13.34
Fe2O3T 11.83 14.19 10.90 13.10 12.55 12.75 13.50 12.56 11.38 11.33 12.20 14.97 10.91
MnO 0.14 0.16 0.21 0.17 0.17 0.16 0.17 0.11 0.23 0.15 0.15 0.17 0.13
MgO 6.97 13.00 11.88 15.36 11.95 15.07 13.87 6.95 8.66 5.03 7.21 16.84 5.07
CaO 11.59 9.35 12.08 8.63 9.93 8.88 9.30 7.46 12.13 12.46 11.30 9.54 10.62
Na2O 2.79 2.15 2.17 1.92 2.33 1.83 2.24 3.15 2.72 3.22 2.84 1.56 2.72
K2O 0.68 0.90 0.47 0.63 0.74 0.60 0.71 1.50 0.59 1.11 1.01 0.63 0.90
P2O5 0.31 0.30 0.34 0.29 0.32 0.27 0.31 0.37 0.33 0.45 0.41 0.29 0.37
Totals:
98.05 99.63 100.29 96.93 99.12 96.03 100.28 95.88 102.28 102.37 100.51 100.27 91.06
LOI 1.6 1.6 4.8 1.5 2.4 0.9 1.6 2.8 1.9 1.8 2.4 5.4 2.4
Major element oxide (wt%) normalized to 100 wt%:
SiO2 47.91 46.05 47.06 45.57 46.57 46.14 45.94 49.69 48.43 48.70 47.60 45.59 48.49
TiO2 2.68 2.25 2.64 2.28 2.51 2.23 2.46 2.89 2.69 3.29 3.11 1.90 3.12
Al2O3 14.41 11.49 12.35 10.79 12.59 10.43 11.61 13.95 13.64 15.05 14.35 8.63 14.65
Fe2O3T 12.07 14.24 10.87 13.52 12.66 13.28 13.46 13.09 11.13 11.07 12.14 14.93 11.98
MnO 0.14 0.16 0.21 0.17 0.17 0.17 0.17 0.12 0.22 0.15 0.15 0.17 0.15
MgO 7.11 13.05 11.85 15.84 12.06 15.69 13.83 7.24 8.47 4.91 7.18 16.79 5.57
CaO 11.82 9.38 12.05 8.90 10.02 9.25 9.28 7.78 11.86 12.17 11.25 9.51 11.66
Na2O 2.85 2.16 2.16 1.98 2.35 1.90 2.24 3.29 2.66 3.14 2.82 1.56 2.99
K2O 0.70 0.91 0.47 0.65 0.75 0.63 0.71 1.56 0.57 1.08 1.00 0.63 0.99
P2O5 0.32 0.30 0.34 0.29 0.32 0.28 0.31 0.38 0.33 0.43 0.41 0.29 0.41
Totals:
100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
Mg# 57.8 68.1 71.7 73.2 68.9 73.3 70.5 56.3 63.9 50.8 57.9 72.4 52.0
Trace element (ppm):
Ba 109 123 115 108 125 102 124 229 150 200 166 104 155
Sr 375 366 389 308 395 295 365 462 536 616 479 349 467
Zr 163 153 181 148 169 141 165 187 181 237 216 128 197
Y 28 22 26 21 24 20 23 23 26 29 28 17 26
V 297 234 270 216 242 220 237 251 289 317 299 175 271
Sc 33 26 30 25 26 26 25 25 30 30 29 20 25
Cu 65 47 86 65 78 61 76 59 91 68 85 43 89
Zn 106 97 127 113 103 118 103 122 109 82 110 108 98
Co 58 72 81 69 66 65 71 63 70 55 58 83 59
Cr 302 666 792 727 588 786 672 120 486 176 306 928 101
Ni 105 409 378 436 330 427 419 317 300 132 100 741 69

All analyses were conducted on samples ignited to 960°C. Fe2O3T = total iron expressed as Fe2O3. LOI = weight loss on ignition. Mg# = 100 × Mg2+/(Mg2+ + Fe2+), assuming that Fe2O3/FeO = 0.15. * = intrusive body (dike).

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