Table T1. Summary of silicate mineral compositions.
ID
Core, section,
interval (cm)
Piece
Depth
(cm)
Petrography
Plagioclase
Olivine
Augite
Orthopyroxene
An
(mol%)
N
Standard
deviation
Fo
(mol%)
N
Standard
deviation
Mg#
N
Standard
deviation
Mg#
N
Standard
deviation

179-1105A-














THY 1R-2, 23-26 1a 1,631 Olivine gabbro 0.524 6 0.025 0.644 7 0.007 0.753 10 0.016


TSB 1R-2, 88-91 2b 1,696 Olivine gabbro 0.527 4 0.015 0.665 3 0.009 0.774 4 0.026


THY 1R-3, 114-117 8b 1,859 Olivine gabbro 0.501 4 0.018 0.633 4 0.006 0.725 3 0.017


TSB 1R-4, 95-98 5 1,985 Olivine gabbro 0.611 7 0.048 0.736 6 0.006 0.794 4 0.011


TSB 1R-4, 141-144 8 2,031 Gabbro 0.591 4 0.012


0.780 4 0.019


TSB 1R-5, 137-141 10 2,173 Olivine gabbro 0.523 4 0.016 0.637 5 0.003 0.747 9 0.023


TSB 2R-1, 79-82 6 2,449 Gabbro 0.650 5 0.003


0.813 5 0.026


THY 2R-2, 47-50 4 2,560 Olivine gabbro 0.645 7 0.001


0.808 1



TSB 3R-1, 51-54 3 2,921 Olivine gabbro 0.625 3 0.029


0.813 12 0.033


TSB 3R-2, 16-20 1b 3,036 Olivine gabbro 0.655 5 0.027


0.835 5 0.008


TSB 3R-2, 87-91 9 3,107 Oxide gabbro 0.286 3 0.040


0.580 5 0.034


THY 4R-1, 92-95 9 3,422 Oxide gabbro 0.362 4 0.008


0.600 4 0.009


TSB 4R-2, 43-46 1b 3,491 Olivine gabbro 0.638 6 0.020 0.739 6 0.002 0.838 4 0.009


TSB 4R-3, 46-60 3 3,628 Olivine gabbro 0.635 6 0.027 0.749 4 0.003 0.825 4 0.010


THY 4R-4, 47-50 6 3,769 Olivine gabbro 0.497 7 0.010 0.683 4 0.003 0.767 7 0.018


TSB 4R-4, 57-62 7 3,779 Apatite oxide gabbro 0.302 4 0.009


0.522 4 0.015


THY 5R-1, 12-16 1 3,842 Oxide gabbro (gneissic) 0.314 6 0.007


0.517 5 0.011


THY 5R-1, 89-93 5 3,919 Gabbro (fine grained) 0.376 4 0.098


0.721 5 0.022


THY 5R-1, 89-93 5 3,919 Oxide gabbro (medium grained)











TSB 5R-1, 115-118 7 3,945 Apatite oxide olivine gabbro 0.304 4 0.011


0.555 5 0.017


TSB 5R-1, 144-147 9 3,974 Apatite oxide olivine gabbro 0.282 4 0.002


0.540 12 0.017


THY 5R-2, 4-7 2 3,982 Oxide olivine gabbro (gneissic) 0.296 4 0.018 0.316 4 0.015 0.548 5 0.011


TSB 5R-2, 55-58 6 4,033 Gabbro 0.528 5 0.054


0.776 4 0.020


THY 6R-1, 124-128 16 4,404 Olivine gabbro, few oxides 0.542 4 0.005


0.771 3 0.015


TSB 6R-2, 32-36 2 4,458 Olivine gabbro 0.527 5 0.052


0.730 5 0.029


TSB 7R-3, 33-36 2 5,096 Orthopyroxene apatite oxide gabbro 0.356 6 0.025


0.575 6 0.018 0.489 4 0.004
THY 7R-3, 72-76 4 5,135 Olivine gabbro 0.483 7 0.037 0.573 5 0.081 0.767 2



TSB 7R-4, 30-33 7 5,212 Olivine gabbro 0.464 5 0.010 0.574 6 0.004 0.732 4 0.014


TSB 8R-1, 68-70 7 5,308 Microgabbro (orthopyroxene, oxides) 0.308 5 0.014


0.623 3 0.016 0.507 7 0.005
TSB 8R-1, 68-70 7 5,308 Gabbro 0.453 5 0.082


0.637 2



TSB 8R-3, 53-56 4 5,508 Gabbro





0.762 6 0.031


TSB 9R-1, 82-86 7 5,822 Olivine gabbro 0.406 4 0.005 0.513 4 0.003 0.671 4 0.023


THY 9R-2, 85-89 11 5,975 Orthopyroxene oxide gabbronorite 0.369 5 0.019


0.633 4 0.017 0.518 3 0.008
THY 9R-3, 118-121 10a 6,145 Oxide gabbro 0.379 4 0.011


0.577 5 0.024


TSB 9R-4, 12-16 1 6,181 Olivine gabbro 0.441 4 0.008 0.496 6 0.006 0.647 4 0.019


TSB 10R-1, 38-42 3a 6,238 Olivine gabbro 0.516 3 0.008 0.608 4 0.004 0.750 8 0.019


THY 10R-2, 38-41 4 6,373 Oxide gabbro 0.353 3 0.004


0.578 3 0.002


TSB 10R-2, 85-88 7 6,420 Oxide gabbro 0.368 4 0.018


0.573 3 0.009


THY 11R-2, 18-21 2 6,858 Apatite oxide olivine gabbro 0.330 5 0.007 0.351 4 0.004 0.551 5 0.019


TSB 11R-2, 51-54 7 6,891 Apatite oxide olivine gabbro 0.324 3 0.012 0.346 4 0.001 0.546 4 0.024


TSB 11R-2, 129-133 12 6,969 Apatite oxide olivine gabbro 0.308 3 0.005 0.355 3 0.001 0.551 4 0.029


THY 12R-1, 28-34 3 7,158 Oxide olivine gabbro 0.339 6 0.004 0.358 6 0.005 0.567 8 0.026


TSB 12R-1, 106-108 13 7,236 Olivine gabbro 0.677 7 0.011 0.735 6 0.006 0.811 2



TSB 12R-2, 50-53 5 7,327 Olivine gabbro 0.611 10 0.013 0.729 4 0.006 0.820 4 0.009


TSB 12R-2, 123-127 15 7,400 Olivine gabbro (fine grained) 0.606 13 0.025 0.714 2
0.807 2



TSB 12R-2, 123-127 15 7,400 Olivine gabbro (coarse grained)


0.714 4 0.006 0.799 5 0.009


TSB 13R-1, 24-26 3a 7,654 Microgabbro 0.458 5 0.014


0.726 4 0.023


TSB 13R-1, 24-26 3a 7,654 Olivine gabbro (coarse grained) 0.507 5 0.023 0.624 7 0.006 0.720 4 0.033


TSB 13R-1, 87-89 3d 7,717 Olivine gabbro 0.500 3 0.038 0.584 4 0.008 0.715 4 0.025


THY 13R-2, 39-43 2 7,809 Oxide gabbro 0.487 3 0.041


0.553 6 0.031


THY 13R-2, 83-86 3a 7,853 Oxide gabbro 0.406 5 0.004


0.654 4 0.009


TSB 13R-3, 38-42 3 7,942 Olivine gabbro (fine grained) 0.398 4 0.021 0.497 4 0.005 0.666 5 0.014


TSB 13R-3, 38-42 3 7,942 Oxide olivine gabbro (coarse grained) 0.419 6 0.013 0.419 3 0.008 0.620 3 0.010


TSB 13R-3, 79-82 6 7,983 Olivine gabbro 0.611 3 0.019 0.764 6 0.003 0.826 3 0.001


TSB 14R-1, 42-45 3a 8,142 Olivine gabbro 0.662 5 0.031 0.747 5 0.004 0.821 4 0.010


THY 14R-1, 80-84 3c 8,180 Oxide gabbro 0.328 4 0.015


0.562 4 0.032


TSB 14R-3, 91-94 7 8,455 Olivine gabbro (foliated) 0.525 3 0.075 0.586 3 0.003 0.747 4 0.013


THY 15R-1, 32-36 3c 8,632 Apatite oxide olivine gabbro (ultramafic)





0.575 4 0.022


TSB 15R-1, 113-116 13 8,713 Olivine gabbro (fine grained) 0.612 3 0.004 0.775 4 0.003 0.810 4 0.012


TSB 15R-1, 113-116 13 8,713 Oxide gabbro (coarse grained) 0.336 3 0.006








TSB 15R-2, 71-74 9a 8,821 Microgabbro 0.352 3 0.006 0.414 3 0.003 0.617 4 0.005


TSB 15R-3, 83-86 8 8,980 Oxide olivine gabbro (gneiss) 0.324 4 0.015 0.364 6 0.006 0.528 4 0.037


TSB 16R-1, 56-58 4d 9,116 Oxide olivine gabbro 0.360 8 0.015








TSB 16R-1, 91-94 10 9,151 Olivine gabbro (foliated) 0.520 4 0.030 0.572 4 0.003 0.595 5 0.007


TSB 16R-2, 14-17 2 9,207 Oxide olivine gabbro 0.332 5 0.014


0.588 3 0.011


TSB 16R-3, 22-25 3 9,356 Olivine gabbro/first component 0.662 4 0.007 0.755 4 0.006 0.829 5 0.009


TSB 16R-3, 22-25 3 9,356 Olivine gabbro/second component 0.378 7 0.021 0.390 4 0.001 0.569 3 0.002


THY 16R-3, 53-56 7 9,387 Oxide gabbro 0.347 5 0.010


0.583 5 0.029


THY 17R-1, 47-51 4 9,607 Oxide olivine gabbro 0.326 6 0.002 0.406 4 0.008 0.580 4 0.021


TSB 17R-2, 23-26 2 9,725 Olivine gabbro 0.649 4 0.004 0.748 3 0.001 0.816 7 0.013


TSB 17R-4, 35-39 4 10,030 Oxide olivine gabbro 0.331 3 0.011 0.394 4 0.007 0.578 3 0.038


THY 18R-1, 96-100 10 10,116 Oxide gabbro 0.376 3 0.007


0.599 8 0.034


THY 18R-2, 8-11 2 10,170 Oxide gabbro 0.344 3 0.003


0.581 5 0.022


TSB 18R-2, 53-57 7 10,215 Oxide olivine gabbro 0.407 9 0.022 0.486 9 0.016 0.654 8 0.024


THY 19R-1, 85-89 6b 10,605 Oxide gabbro 0.414 4 0.018


0.631 4 0.010


TSB 19R-2, 65-68 6 10,735 Olivine gabbro (troctolitic) 0.451 2
0.497 4 0.016 0.685 3 0.026


TSB 19R-2, 95-98 8a 10,765 Oxide gabbro 0.431 3 0.008


0.657 5 0.039


TSB 19R-3, 94-97 8a 10,899 Olivine gabbro 0.616 8 0.074 0.522 15 0.011 0.753 5 0.023


THY 20R-1, 46-49 6 11,026 Oxide gabbro 0.359 9 0.026


0.583 4 0.024


TSB 21R-1, 49-52 6 11,129 Olivine gabbro 0.602 3 0.045 0.676 6 0.005 0.829 3 0.020


THY 21R-2, 121-125 14 11,335 Oxide gabbro 0.471 4 0.016


0.602 5 0.030


TSB 22R-1, 103-106 15 11,613 Apatite oxide gabbro (mylonite) 0.341 5 0.022


0.606 8 0.031


THY 22R-2, 27-30 2a 11,677 Oxide gabbro 0.396 5 0.008


0.628 4 0.012


TSB 22R-2, 74-78 5 11,724 Orthopyroxene oxide gabbronorite 0.356 5 0.008


0.610 4 0.071 0.498 3 0.012
TSB 22R-3, 130-133 8 11,898 Oxide olivine gabbro (fine grained); few oxides 0.462 6 0.006 0.595 4 0.008 0.717 5 0.021


TSB 23R-1, 94-98 8 12,034 Oxide olivine gabbro (fine grained) 0.394 9 0.010 0.481 4 0.002 0.652 5 0.023


TSB 23R-1, 94-98 8 12,034 Oxide olivine gabbro (medium grained) 0.409 4 0.066 0.469 4 0.004 0.626 4 0.015


TSB 23R-2, 98-101 11 12,188 Oxide gabbro 0.421 6 0.012


0.601 4 0.065


TSB 24R-1, 32-36 3b 12,472 Oxide olivine gabbro, very few oxides 0.433 18 0.031 0.584 13 0.028 0.699 9 0.015


THY 24R-3, 74-77 6 12,790 Oxide gabbro 0.432 5 0.003


0.641 9 0.006


TSB 25R-1, 26-30 2 12,926 Oxide gabbro (fine grained) 0.363 6 0.011


0.619 5 0.007


TSB 25R-1, 26-30 2 12,926 Oxide gabbro (coarse grained) 0.355 3 0.001


0.614 5 0.001


TSB 25R-1, 133-137 5c 13,033 Oxide olivine gabbro 0.357 8 0.022 0.495 1
0.583 4 0.028


THY 25R-2, 18-21 1 13,062 Oxide olivine gabbro 0.414 8 0.063 0.402 4 0.006 0.592 3 0.001


TSB 25R-3, 10-13 1 13,193 Oxide gabbro (mylonitic) 0.409 5 0.008


0.628 4 0.001


THY 26R-1, 50-54 2 13,450 Orthopyroxene apatite oxide gabbro 0.357 6 0.029


0.514 4 0.005 0.507 4 0.005
TSB 26R-3, 80-81 5 13,756 Olivine gabbro 0.585 5 0.034 0.687 4 0.002 0.805 4 0.009


TSB 27R-1, 27-28 1a 13,897 Olivine gabbro 0.595 4 0.041 0.720 4 0.003 0.822 6 0.020


THY 27R-1, 71-75 3 13,941 Orthopyroxene apatite oxide biotite gabbro 0.328 5 0.007





0.481 4 0.007
TSB 27R-3, 93-94 2 14,195 Olivine gabbro (anorthositic); olivine interstitial 0.621 4 0.004 0.529 6 0.005 0.820 4 0.016


TSB 28R-1, 98-99 3b 14,468 Olivine gabbro 0.607 7 0.027 0.700 5 0.001 0.777 8 0.008


TSB 29R-1, 102-106 4 14,942 Olivine gabbro (mylonitic) 0.515 6 0.015 0.640 4 0.008 0.791 7 0.027


TSB 29R-3, 112-114 3 15,221 Oxide olivine gabbro 0.424 18 0.013 0.509 10 0.004 0.662 24 0.023


THY 29R-4, 13-17 1 15,253 Oxide gabbro 0.369 5 0.009


0.612 6 0.033


TSB 29R-4, 31-33 2 15,271 Oxide gabbro 0.348 3 0.001


0.641 4 0.005


TSB 30R-1, 27-31 3a 15,367 Oxide gabbro 0.374 10 0.010


0.662 3 0.007


TSB 30R-2, 109-113 8 15,585 Oxide gabbro (fine grained) 0.407 3 0.012


0.653 4 0.011


TSB 30R-3, 102-106 9 15,712 Olivine gabbro 0.544 3 0.008 0.598 4 0.001 0.724 4 0.009


Notes: ID = shipboard sample codes. An = anorthite. Fo = forsterite. Mg# = Mg/(Mg+Fe) with iron as total FeO. N = number of analyses used for each average.