Table T6. Representative orthopyroxene compositions for the major rock types, Hole 735B. (Continued on next page.)
Leg, hole:
118-735B- 176-735B-
Core, section: Interval (cm):
85R-7
0-5
69R-5
31-41
207R-5
76-81
189R-7
75-81
158R-1
69-75
161R-2
114-119
161R-3
128-135
145R-5
49-53
161R-3
128-135
161R-2
114-119
190R-6
42-48
147R-5
67-75
162R-6
29-36
154R-3
71-79
154R-3
71-79
154R-3
71-79
Rock type: Troctolitic gabbro
Olivine Gabbro
Gabbro
Oxide gabbro
Major element oxide (wt%):                          
SiO2 55.37 54.41 53.36 53.56 53.18 52.25 52.51 52.45 51.77 50.80 53.67 52.89 53.49 53.24 52.90 52.05
TiO2 0.35 0.26 0.45 0.38 0.39 0.26 0.35 0.36 0.21 0.08 0.26 0.27 0.41 0.06 0.32 0.35
Al2O3 1.16 1.35 1.41 1.14 1.29 1.07 1.04 0.98 0.66 0.31 1.27 0.81 1.13 0.92 1.14 0.97
FeO 10.47 12.92 15.53 16.92 17.67 18.71 20.25 22.98 24.25 27.67 15.65 20.43 16.74 18.32 19.36 21.80
Cr2O3 0.06 0.00 0.00 0.03 0.06 0.11 0.09 0.00 0.07 0.00 0.10 0.00 0.04 0.03 0.03 0.08
MnO 0.30 0.31 0.35 0.36 0.38 0.34 0.54 0.62 0.79 1.26 0.30 0.57 0.44 0.57 0.60 0.65
MgO 31.14 28.85 27.89 26.31 25.61 24.91 23.26 22.47 20.85 18.18 27.71 23.21 26.59 25.83 24.63 22.90
CaO 0.76 0.86 1.29 1.05 1.49 1.50 1.51 1.07 1.41 1.11 1.23 0.85 1.15 0.77 1.00 0.92
Na2O 0.00 0.04 0.20 0.17 0.28 0.12 0.16 0.26 0.11 0.22 0.24 0.12 0.18 0.16 0.19 0.11
Total 99.61 99.00 100.48 99.91 100.36 99.28 99.72 101.21 100.13 99.63 100.43 99.15 100.16 99.89 100.17 99.84
Number of cations based on 6 O:                          
Si 1.9584 1.9590 1.9248 1.9512 1.9402 1.9387 1.9527 1.9447 1.9565 1.9667 1.9363 1.9733 1.9445 1.9536 1.9472 1.9463
Ti 0.0093 0.0070 0.0123 0.0104 0.0108 0.0073 0.0099 0.0100 0.0061 0.0024 0.0070 0.0076 0.0111 0.0017 0.0089 0.0099
AlIV 0.0416 0.0410 0.0600 0.0488 0.0554 0.0466 0.0457 0.0429 0.0292 0.0141 0.0540 0.0267 0.0485 0.0398 0.0495 0.0429
AlVI 0.0068 0.0163 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0090 0.0000 0.0000 0.0000 0.0000
Fe+2 0.3097 0.3888 0.4683 0.5154 0.5390 0.5805 0.6296 0.7125 0.7663 0.8956 0.4721 0.6375 0.5089 0.5620 0.5958 0.6815
Cr 0.0017 0.0000 0.0000 0.0008 0.0018 0.0033 0.0027 0.0000 0.0022 0.0000 0.0028 0.0000 0.0012 0.0008 0.0010 0.0022
Mn 0.0090 0.0095 0.0108 0.0112 0.0117 0.0108 0.0171 0.0194 0.0252 0.0413 0.0092 0.0179 0.0134 0.0177 0.0187 0.0207
Mg 1.6420 1.5491 1.4999 1.4290 1.3930 1.3779 1.2894 1.2422 1.1749 1.0495 1.4907 1.2912 1.4410 1.4128 1.3515 1.2767
Ca 0.0288 0.0332 0.0497 0.0409 0.0584 0.0596 0.0602 0.0425 0.0572 0.0459 0.0476 0.0338 0.0447 0.0303 0.0393 0.0370
Na 0.0000 0.0080 0.0393 0.0343 0.0562 0.0249 0.0332 0.0541 0.0235 0.0476 0.0479 0.0247 0.0353 0.0325 0.0385 0.0228
Total 4.0072 4.0120 4.0651 4.0419 4.0667 4.0496 4.0406 4.0684 4.0411 4.0632 4.0677 4.0217 4.0486 4.0513 4.0504 4.0400
En 82.9 78.6 74.3 72.0 70.0 68.3 65.2 62.2 58.8 52.7 74.2 65.8 72.2 70.5 68.0 64.0
Fe 15.6 19.7 23.2 26.0 27.1 28.8 31.8 35.7 38.3 45.0 23.5 32.5 25.5 28.0 30.0 34.2
Wo 1.5 1.7 2.5 2.1 2.9 3.0 3.0 2.1 2.9 2.3 2.4 1.7 2.2 1.5 2.0 1.9

Note: En = enstatite, Fe = ferrosilite, Wo = wollastonite.