Table T31. Average maximum grain size of igneous Units 1256C-18 and 1256D-1.
Plagioclase
Montmorillonite
Clinopyroxene
Thin section
Depth (mbsf)
Length
(mm)
Width
(mm)
Area
(mm2)
W/L
EQD
Length
(mm)
Width
(mm)
Area
(mm2)
W/L
EQD
Length
(mm)
Width
(mm)
Area
(mm2)
W/L
EQD
Unit 1256C-18














27 281.5 0.567 0.059 0.033 0.112 0.204




0.224 0.053 0.012 0.243 0.122
28 282.1 1.046 0.115 0.119 0.113 0.389




0.780 0.122 0.090 0.171 0.338
29 282.6 1.197 0.131 0.163 0.116 0.456




0.866 0.126 0.111 0.147 0.376
30 284.8 1.135 0.156 0.182 0.136 0.481




0.877 0.201 0.172 0.237 0.468
31 285.3 1.472 0.270 0.393 0.188 0.707




0.946 0.310 0.299 0.345 0.617
32 286.0 1.308 0.318 0.408 0.252 0.721




0.916 0.362 0.328 0.410 0.646
33 286.5 1.340 0.296 0.393 0.232 0.707




1.000 0.270 0.284 0.281 0.601
34 287.1 1.322 0.320 0.435 0.239 0.744




0.908 0.298 0.280 0.338 0.597
35 287.6 1.982 0.466 0.862 0.257 1.048




1.480 0.330 0.495 0.233 0.794
36 288.2 1.716 0.546 0.945 0.351 1.097




1.412 0.322 0.474 0.244 0.777
37 288.7 2.696 0.534 1.534 0.211 1.398




1.418 0.494 0.713 0.334 0.953
38 289.3 1.818 0.456 0.855 0.256 1.044




1.660 0.452 0.756 0.272 0.981
39 289.9 2.328 0.520 1.247 0.223 1.260




1.602 0.476 0.821 0.297 1.022
40 290.5 1.366 0.258 0.369 0.192 0.686




1.468 0.400 0.568 0.301 0.851
41 291.1 1.682 0.446 0.746 0.306 0.975




0.736 0.366 0.268 0.518 0.584
42 291.7 2.568 0.998 2.476 0.406 1.775




0.838 0.316 0.247 0.434 0.561
43 292.4 2.070 0.824 1.697 0.413 1.470




0.904 0.298 0.277 0.353 0.593
44 292.9 1.870 0.688 1.344 0.383 1.308




1.268 0.386 0.533 0.288 0.823
45 293.4 1.662 0.436 0.718 0.274 0.956




1.022 0.322 0.320 0.348 0.639
46 293.8 1.588 0.408 0.649 0.259 0.909




0.802 0.260 0.209 0.334 0.516
47 294.0 1.704 0.494 0.886 0.306 1.062




0.970 0.344 0.329 0.383 0.647
48 294.3 1.674 0.408 0.674 0.261 0.927




0.648 0.334 0.221 0.528 0.531
49 294.7 1.742 0.624 1.079 0.376 1.172




0.786 0.200 0.158 0.254 0.449
50 294.3 1.566 0.448 0.710 0.289 0.951




0.768 0.218 0.171 0.301 0.467
51 294.9 1.584 0.362 0.556 0.249 0.841




0.830 0.286 0.241 0.348 0.553
52 295.5 1.768 0.490 0.834 0.292 1.030




1.258 0.376 0.452 0.310 0.759
53 296.0 1.772 0.374 0.710 0.209 0.951




0.876 0.420 0.361 0.487 0.678
54 296.4 1.474 0.302 0.459 0.213 0.764




1.016 0.396 0.390 0.415 0.705
55 296.9 1.774 0.300 0.551 0.175 0.837




0.840 0.336 0.275 0.428 0.592
56 297.3 1.592 0.312 0.488 0.204 0.789




0.806 0.316 0.238 0.421 0.550
57 297.8 1.618 0.414 0.682 0.259 0.932




0.832 0.366 0.320 0.466 0.638
58 298.3 1.826 0.480 0.916 0.261 1.080




0.764 0.368 0.277 0.510 0.594
59 298.9 1.514 0.314 0.453 0.215 0.760




0.848 0.388 0.317 0.510 0.635
60 299.6 1.434 0.256 0.374 0.176 0.690




0.820 0.440 0.361 0.571 0.678
61 300.0 1.718 0.366 0.628 0.228 0.894




0.742 0.422 0.322 0.598 0.640
62 300.7 1.290 0.338 0.444 0.278 0.752




0.690 0.440 0.310 0.638 0.628
63 300.9 1.420 0.432 0.621 0.296 0.889




0.754 0.374 0.290 0.531 0.607
64 303.9 1.774 0.340 0.637 0.195 0.900




0.848 0.430 0.378 0.524 0.693
65 304.4 1.370 0.248 0.362 0.183 0.679




0.742 0.428 0.330 0.569 0.648
66 305.0 1.400 0.350 0.493 0.240 0.792




0.928 0.516 0.497 0.574 0.796
67 305.6 1.364 0.276 0.369 0.208 0.685




0.858 0.430 0.366 0.554 0.683
68 306.2 1.524 0.356 0.526 0.251 0.818




0.828 0.428 0.354 0.536 0.671
69 306.9 1.364 0.276 0.369 0.208 0.685




0.914 0.592 0.579 0.663 0.859
70 307.4 1.440 0.314 0.468 0.205 0.772




0.816 0.406 0.337 0.519 0.655
71 308.0 1.562 0.260 0.410 0.169 0.723




0.700 0.372 0.278 0.554 0.595
72 308.6 1.778 0.272 0.482 0.163 0.783




0.862 0.434 0.387 0.527 0.702
73 309.3 1.804 0.288 0.528 0.168 0.820




1.084 0.528 0.603 0.520 0.876
74 309.9 1.756 0.356 0.630 0.212 0.896




1.100 0.602 0.646 0.593 0.907
75 310.4 1.534 0.214 0.327 0.141 0.645




1.056 0.508 0.523 0.505 0.816
76 311.2 1.336 0.260 0.352 0.201 0.669




0.732 0.316 0.226 0.472 0.537
77 311.7 1.512 0.282 0.449 0.191 0.756




0.811 0.297 0.234 0.385 0.546
78 311.9 0.795 0.103 0.082 0.131 0.322




0.443 0.133 0.058 0.301 0.272
79 312.1 0.02700 0.01400 0.00040 0.55105 0.022 0.0975 0.0775 0.00763 0.7923 0.099 0.027 0.016 0.00044 0.620 0.024
80 312.4 0.03160 0.01480 0.00047 0.46358 0.025 0.0304 0.0220 0.00068 0.7318 0.030 0.020 0.013 0.00026 0.666 0.018
81 312.8 0.01660 0.00800 0.00013 0.57706 0.013 0.0178 0.0116 0.00020 0.6825 0.016 0.016 0.012 0.00020 0.758 0.016
82 313.0 0.03000 0.01280 0.00041 0.44008 0.023 0.0168 0.0116 0.00019 0.7112 0.016 0.014 0.011 0.00016 0.794 0.014
83 313.3 0.02000 0.00560 0.00011 0.30434 0.012 0.0132 0.0090 0.00012 0.6952 0.012 0.013 0.009 0.00011 0.712 0.012
84 313.3




0.0122 0.0078 0.00010 0.6221 0.011 0.014 0.008 0.00011 0.593 0.012


















Unit 1256D-1














90 276.6 1.312 0.222 0.288 0.177 0.606










91 277.0 1.236 0.206 0.247 0.172 0.561










92 281.4 3.010 0.498 1.535 0.189 1.398










93 286.0 2.122 0.612 1.269 0.295 1.271










94 288.5 2.088 0.552 1.184 0.267 1.228










96 289.8 1.554 0.350 0.519 0.242 0.813










95 293.9 1.746 0.488 0.859 0.273 1.046










97 300.8 1.536 0.274 0.415 0.182 0.727










98 303.4 1.560 0.308 0.463 0.201 0.767










99 307.5 1.914 0.394 0.742 0.221 0.972










100 315.4 1.600 0.330 0.533 0.211 0.824










101 319.6 1.820 0.348 0.611 0.198 0.882










102 324.1 1.634 0.260 0.447 0.164 0.755










103 328.4 1.394 0.276 0.378 0.199 0.693










104 328.5 1.470 0.250 0.354 0.174 0.671










105 329.2 1.642 0.248 0.415 0.149 0.727










106 334.9 1.388 0.248 0.360 0.180 0.677










107 349.9 2.048 0.210 0.428 0.106 0.739










138* Host lobes within 4 mm above and below the seal zone Recrystallized montmorillonite has unimodal size Recrystallized clinopyroxene is bimodal
Upper flow
0.455 0.053
0.098 0.171




0.168 0.096
0.520 0.144
Recrystallized





0.0174 0.0142
0.8266 0.0177 0.012 0.009
0.771 0.012 Coarse part
Recrystallized










0.006 0.005
0.785 0.006 Fine part
Lower flow
0.643 0.100
0.130 0.2874




0.251 0.147
0.515 0.218

Notes: W/L = width/length. EQD = diameter of a circle with equivalent area to a crystal. * = grain sizes of recrystallized flow-lobe margin and adjacent lava above and below. Note: This table is also available in ASCII.