Table S.1. Dredge averaged statistics compiled from sample descriptions # General Dredge Information Dredged Rock Lithologies1 Basalt Statistics2 Dredge #3 Latitude ([deg]S) Longitude ([deg]E) Depth4 (mbsl) Location SR5 (mm/yr) ESR6 (mm/yr) Weight (kg) Pillow Basalt & Basalt Peridotite & Dunite Gabbro Diabase Hawaiite Hydroth. & Volc-clastic Sed. Rocks & Erratics % Plag Phenos % Oliv Phenos % Cpx Phenos % Vesicles Oblique Supersegment (9[deg]56' - 15[deg]45' E) Amagmatic Segments (9[deg]56' - 11[deg] E; 11[deg]36' - 14[deg]15' E; 14[deg]54' - 15[deg]45' E) VAN7-95 52.880 9.940 4394 Tr Wall 14.04 12.34 15.7 0.5 0.0 0.2 0.1 0.0 0.3 14.6 10.0 1.5 0.0 10.5 VAN7-96 53.140 9.979 3143 Tr Wall 14.06 12.36 70.6 0.0 25.6 2.9 6.8 0.0 35.4 0.0 nd nd nd nd VAN7-94 52.990 10.130 4500 Tr Wall 14.06 12.38 1.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 VAN7-93 52.979 10.547 3260 Tr Wall 14.07 12.43 20.1 20.1 0.0 0.0 0.0 0.0 0.0 0.0 10.5 0.5 0.0 0.0 KN162-9-28 52.896 10.674 3803 Tr Floor 14.07 12.45 212.5 211.6 0.0 0.4 0.0 0.0 0.5 0.0 1.1 2.4 0.0 5.2 KN162-9-27 7 52.403 10.696 2880 Tr Wall 14.05 n.d. 180.6 120.9 0.0 5.0 4.7 0.0 50.0 0.0 4.4 0.0 0.0 6.0 VAN7-92 52.860 10.888 3633 Tr Wall 14.08 12.48 41.0 41.0 0.0 0.0 0.0 0.0 0.0 0.0 5.7 2.3 0.0 2.4 KN162-9-36 52.749 11.711 4017 Tr Floor 14.11 7.52 101.5 101.5 0.0 0.0 0.0 0.0 0.0 0.0 1.0 0.0 0.0 1.6 KN162-9-37 52.679 11.812 3916 Tr Wall 14.11 7.54 214.7 0.8 207.2 0.0 4.8 0.0 0.0 1.9 3.3 0.0 0.0 1.3 KN162-9-38 52.777 11.854 4061 Tr Wall 14.11 7.54 176.8 166.1 0.0 0.0 2.4 0.0 2.9 5.4 2.0 1.3 0.1 4.9 PS86-6 52.441 11.923 4246 Tr Wall 14.12 7.59 186.6 14.7 171.9 0.0 0.0 0.0 0.0 0.0 7.2 0.5 0.0 8.3 PS86-7 52.758 11.923 4150 Tr Wall 14.12 7.59 0.9 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 KN162-9-39 52.672 12.045 4502 Tr Floor 14.12 7.59 0.9 0.0 0.0 0.0 0.0 0.0 0.9 0.0 nd nd nd nd KN162-9-40 52.670 12.070 4282 Tr Floor 14.12 7.59 66.8 2.6 0.0 0.0 0.0 0.0 0.0 64.2 0.6 0.8 0.0 0.0 KN162-9-41 52.589 12.132 4361 Tr Wall 14.11 7.60 52.3 21.3 0.0 0.0 0.7 0.0 30.0 0.3 4.7 2.5 1.0 10.3 KN162-7-01 7 51.626 12.174 2320 Tr Wall 14.07 n.d. 18.1 0.0 0.0 0.0 0.0 12.7 4.5 0.9 nd nd nd nd KN162-9-42 52.720 12.230 3690 Tr Wall 14.12 7.63 90.4 0.5 85.0 0.0 0.0 0.0 0.2 4.7 0.0 0.0 0.0 24.0 KN162-9-44b 52.611 12.373 4278 Tr Floor 14.13 7.65 empty - - - - - - - - - - - KN162-9-44a 52.590 12.403 4503 Tr Floor 14.13 7.65 empty - - - - - - - - - - - KN162-9-46 52.631 12.491 4070 Tr Wall 14.13 7.68 85.2 0.0 73.1 0.0 0.5 0.0 10.6 1.0 nd nd nd nd KN162-9-45 52.490 12.496 4048 Tr Wall 14.12 7.69 52.6 0.2 32.4 0.0 0.0 0.0 19.4 0.6 0.0 nd nd nd KN162-9-43 52.645 12.526 3730 Tr Wall 14.13 7.68 141.5 8.7 55.9 0.0 0.0 0.0 67.7 9.2 12.2 0.5 0.1 14.8 KN162-9-47 52.562 12.662 4361 Tr Wall 14.13 7.72 143.7 0.5 137.8 0.0 0.0 0.0 3.0 2.4 0.0 nd nd nd KN162-9-50a 52.420 12.748 3930 Tr Wall 14.13 7.74 empty - - - - - - - - - - - KN162-9-50b 52.420 12.748 3930 Tr Wall 14.13 7.74 32.9 0.0 32.4 0.0 0.0 0.0 0.0 0.5 nd nd nd nd KN162-9-48 52.560 12.799 4090 Tr Wall 14.14 7.74 157.7 137.0 0.0 0.0 20.5 0.0 0.1 0.1 5.3 4.9 0.0 13.3 KN162-9-49 52.479 12.861 4193 Tr Floor 14.14 7.76 49.6 48.7 0.0 0.0 0.0 0.0 0.0 0.9 1.8 0.4 0.0 6.3 KN162-9-51 52.296 13.062 2210 Tr Wall 14.14 8.80 181.1 123.5 30.2 0.0 0.0 0.0 1.7 25.7 2.0 4.3 0.4 9.4 KN162-9-53 52.475 13.144 4315 Tr Wall 14.15 8.81 45.6 23.6 21.7 0.0 0.0 0.0 0.0 0.3 2.3 0.5 0.0 2.3 KN162-9-52 52.392 13.197 4399 Tr Floor 14.15 8.83 empty - - - - - - - - - - - VAN7-91 52.090 13.267 3100 Tr Wall 14.14 8.84 109.7 60.0 0.0 21.1 0.0 0.0 16.3 12.4 5.3 0.2 0.1 4.5 KN162-9-54 52.437 13.312 4291 Tr Wall 14.15 8.85 1.6 0.0 0.0 0.0 0.0 0.0 0.0 1.6 nd nd nd nd KN162-9-55 52.433 13.410 4094 Tr Wall 14.16 8.87 66.3 3.2 57.7 2.9 0.0 0.0 0.0 2.5 4.2 9.5 0.0 0.0 KN162-9-56 52.370 13.506 4050 Tr Floor 14.16 8.89 59.0 0.4 57.4 0.0 0.0 0.0 0.1 1.1 0.0 0.0 0.0 1.5 PS86-5 52.305 13.673 3740 Tr Wall 14.16 10.11 131.2 130.8 0.0 0.0 0.0 0.0 0.0 0.4 0.9 1.0 0.0 0.0 PS86-5B 52.276 13.706 3825 Tr Wall 14.16 10.15 100.8 100.8 0.0 0.0 0.0 0.0 0.0 0.0 0.4 0.4 0.0 0.1 KN162-9-58 52.157 13.731 2575 Tr Wall 14.16 10.20 204.9 25.7 136.2 0.0 25.0 0.0 0.0 18.0 3.3 3.3 0.0 8.7 KN162-9-57 52.224 13.738 3526 Tr Wall 14.16 10.20 3.4 0.0 0.0 0.0 0.0 0.0 0.0 3.4 0.0 nd nd nd KN162-9-59 52.278 13.996 3553 Tr Wall 14.17 10.26 35.5 0.0 35.3 0.0 0.0 0.0 0.0 0.2 0.0 nd nd nd KN162-9-60 52.157 14.118 3249 Tr Floor 14.17 10.28 empty - - - - - - - - - - - PS86-4 52.134 14.166 3766 Tr Wall 14.17 10.28 163.5 9.5 129.8 23.1 1.1 0.0 0.0 0.0 6.2 1.2 2.0 7.7 KN162-9-62 52.253 15.103 4005 Tr Wall 14.21 11.96 53.0 0.0 52.7 0.0 0.0 0.0 0.0 0.3 0.0 nd nd nd VAN7-86 52.140 15.166 3749 Tr Wall 14.21 11.97 131.6 0.0 115.7 0.0 0.0 0.0 0.0 16.0 0.0 nd nd nd VAN7-85 52.253 15.233 4181 Tr Wall 14.22 11.99 89.6 0.0 75.5 0.0 1.9 0.0 11.7 0.6 0.0 nd nd nd KN162-9-63 52.148 15.403 3857 Tr Wall 14.22 12.01 0.5 0.5 0.0 0.0 0.0 0.0 0.0 0.0 15.0 9.0 0.0 20.0 VAN7-84 52.157 15.428 4050 Tr Wall 14.22 12.02 20.0 0.0 0.0 0.0 0.0 0.0 0.0 20.0 0.0 nd nd nd GC-1a 52.205 15.512 4067 Tr Wall 14.23 12.03 1.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0 0.0 nd nd nd VAN7-82 52.022 15.655 2344 Tr Wall 14.23 12.04 empty - - - - - - - - - - - PS86-1 52.133 15.933 3526 Tr Wall 14.23 12.05 empty - - - - - - - - - - - Amagmatic Segment Averages 8 3511.7 39.2% 43.7% 1.6% 1.9% 0.4% 7.3% 6.0% 3% 2% 0% 6% "Joseph Mayes Seamount (11[deg] - 11[deg]36' E, excluding D29 & D30)" KN162-9-31 52.805 11.082 3074 West Axis 14.08 13.28 2.2 2.2 0.0 0.0 0.0 0.0 0.0 0.0 33.8 0.0 0.0 0.0 KN162-9-32 52.749 11.218 2720 NW Arm 14.09 13.30 83.9 74.7 0.0 0.0 6.4 0.0 0.8 2.0 11.2 0.8 0.0 6.6 KN162-9-33 52.817 11.387 1462 N Peak 14.10 13.32 50.3 49.1 0.0 0.0 0.0 0.0 0.1 1.1 1.9 0.2 0.0 22.8 IO 11/76-75 52.900 11.388 1940 East axis 14.10 13.32 1.7 1.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.5 KN162-9-34 52.857 11.430 2126 N Peak 14.10 13.32 79.6 79.6 0.0 0.0 0.0 0.0 0.0 0.0 10.7 0.8 0.0 5.4 KN162-9-35 52.927 11.555 2606 SE Arm 14.11 13.34 100.1 100.1 0.0 0.0 0.0 0.0 0.0 0.0 6.6 2.2 0.0 19.0 Joseph Mayes Seamount Averages 317.7 96.7% 0.0% 0.0% 2.0% 0.0% 0.3% 1.0% 11% 1% 0% 10% Rift Mountains North & South of Joseph Mayes Smt KN162-9-29a 52.956 11.035 3516 Tect Block 14.09 13.28 2.0 0.0 0.0 0.0 0.0 0.0 0.0 2.0 nd nd nd nd KN162-9-29b 52.962 11.097 3665 Tect Block 14.09 13.29 empty - - - - - - - - - - - KN162-9-30 52.994 11.157 3587 Tect Block 14.10 13.30 106.9 42.8 60.8 0.0 0.0 0.0 0.0 3.3 2.6 0.9 0.0 4.0 IO11/76-76 core 52.532 11.617 2963 Tect Block 14.10 13.31 0.1 0.0 0.1 0.0 0.0 0.0 0.0 0.0 nd nd nd nd Rift Mountain Averages 109.0 39.3% 55.9% 0.0% 0.0% 0.0% 0.0% 4.9% 2.6 0.9 0.0 4.0 Narrowgate Segment (14[deg]15' - 14[deg]54' E) VAN7-90 52.180 14.353 3800 RV Axis 14.18 14.14 222.3 222.3 0.0 0.0 0.0 0.0 0.0 0.0 0.5 1.3 0.0 3.6 PS86-3 52.151 14.491 3694 RV Wall 14.18 14.14 176.8 47.0 0.0 0.0 129.8 0.0 0.0 0.0 1.0 0.0 0.0 4.7 VAN7-89 52.250 14.597 2570 RV Wall 14.19 14.15 235.0 224.6 0.0 0.0 0.0 0.0 10.4 0.0 1.8 0.2 0.0 6.0 KN162-9-61 52.104 14.601 2282 RV Wall 14.19 14.15 252.8 23.9 0.0 0.0 100.7 0.0 106.6 21.6 5.8 0.5 0.0 3.5 PS86-2 52.212 14.695 3191 RV Axis 14.20 14.17 20.0 20.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 0.8 0.0 4.3 VAN7-88 52.220 14.706 3032 RV Axis 14.20 14.17 211.7 211.7 0.0 0.0 0.0 0.0 0.0 0.0 4.3 0.5 0.0 18.8 VAN7-87 52.240 14.789 3611 RV Axis 14.20 14.17 0.5 0.5 0.0 0.0 0.0 0.0 0.0 0.0 30.0 0.0 0.0 4.3 Narrowgate Segment Averages 1119.1 67.0% 0.0% 0.0% 20.6% 0.0% 10.5% 1.9% 6% 0% 0% 6% Oblique Supersegment Averages (All dredges) 5057.5 49.0% 31.5% 1.1% 6.0% 0.3% 7.4% 4.7% 4% 1% 0% 7% Orthogonal Supersegment (15[deg]45' - 25[deg] E) KN162-9-64 52.293 15.644 2947 RV Wall 14.23 12.04 42.6 4.5 0.0 0.0 37.1 0.0 0.0 1.0 0.1 3.4 0.0 2.8 VAN7-81 52.228 15.789 4231 RV Wall 14.24 12.08 empty - - - - - - - - - - - VAN7-83 52.170 15.837 3993 RV Axis 14.24 12.08 58.1 58.1 0.0 0.0 0.0 0.0 0.0 0.0 2.7 1.7 0.0 3.1 VAN7-80 52.230 16.007 4134 RV Axis 14.25 14.24 56.4 56.4 0.0 0.0 0.0 0.0 0.0 0.0 1.3 2.0 0.0 7.8 VAN7-79 52.300 16.125 4145 RV Axis 14.25 14.24 299.3 299.0 0.0 0.0 0.0 0.0 0.3 0.0 1.8 1.0 0.0 3.9 KN162-7-02 52.330 16.233 3855 RV Axis 14.23 14.22 11.2 11.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 7.5 KN162-7-03 52.299 16.507 3481 RV Axis 14.27 14.04 6.4 6.4 0.0 0.0 0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.8 VAN7-78 52.380 16.635 4025 RV Wall 14.27 14.04 173.8 7.2 129.5 36.7 0.0 0.0 0.0 0.5 0.4 0.6 0.0 0.3 AG22-01 52.310 16.975 3700 RV Wall 14.28 14.23 11.7 11.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 AG22-02 52.294 17.040 3115 RV Wall 14.29 14.24 empty - - - - - - - - - - - VAN7-77 52.422 17.065 3063 RV Wall 14.29 14.24 38.9 4.1 1.3 0.0 31.7 0.0 0.8 1.0 10.0 1.0 0.0 0.0 KN162-7-04 52.358 17.113 3928 RV Axis 14.29 14.24 203.5 203.5 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.4 0.0 0.2 KN162-7-05 52.423 17.428 3090 RV Axis 14.30 14.25 7.5 7.5 0.0 0.0 0.0 0.0 0.0 0.0 1.0 0.5 0.0 7.5 KN162-7-06 52.520 17.702 3582 RV Axis 14.32 14.28 39.5 39.5 0.0 0.0 0.0 0.0 0.0 0.0 5.4 1.0 0.0 1.3 AG22-03 52.608 18.040 4200 RV Axis 14.28 14.14 14.8 9.4 0.0 0.0 5.5 0.0 0.0 0.0 0.0 nd nd nd VAN7-76 52.631 17.922 3442 RV Wall 14.33 14.21 163.8 92.5 15.7 0.0 54.4 0.0 0.0 1.3 4.6 4.4 0.0 2.9 KN162-7-07 52.548 18.028 4001 RV Axis 14.33 14.22 38.6 38.6 0.0 0.0 0.0 0.0 0.0 0.0 0.5 0.0 0.0 6.3 KN162-7-08 52.615 18.336 3702 RV Axis 14.34 14.24 96.2 96.2 0.0 0.0 0.0 0.0 0.0 0.0 0.4 0.4 0.0 3.8 KN162-7-09b 52.700 18.826 4012 RV Axis 14.36 14.27 6.4 6.4 0.0 0.0 0.0 0.0 0.0 0.0 2.0 0.0 0.0 1.0 KN162-7-09a 52.695 18.827 4060 RV Axis 14.36 14.27 empty - - - - - - - - - - - AG22-04 52.718 19.038 3850 RV Axis 14.37 14.28 empty - - - - - - - - - - - AG22-05 52.773 19.073 3850 RV Wall 14.37 14.28 56.7 52.7 0.0 0.0 4.0 0.0 0.0 0.0 0.0 nd nd nd KN162-7-11 52.799 19.200 3886 RV Wall 14.37 14.29 115.5 115.5 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.1 0.0 5.0 KN162-7-10 52.745 19.269 3165 RV Axis 14.37 14.29 49.0 49.0 0.0 0.0 0.0 0.0 0.0 0.0 0.4 0.0 0.0 2.9 AG22-06 52.769 19.430 3770 RV Axis 14.37 14.31 empty - - - - - - - - - - - KN162-7-12b 52.842 19.767 4440 RV Axis 14.39 14.38 empty - - - - - - - - - - - KN162-7-12a 52.835 19.769 4397 RV Axis 14.39 14.38 empty - - - - - - - - - - - VAN7-75 53.000 19.775 1731 RV Wall 14.40 14.39 96.5 85.7 0.0 0.0 3.3 0.2 0.9 6.5 14.8 0.1 0.0 1.0 VAN7-74 52.900 19.783 4111 RV Wall 14.40 14.39 74.9 73.0 0.0 0.0 0.0 0.0 1.9 0.0 0.5 0.2 0.0 2.6 KN162-7-13 52.856 19.913 4071 RV Axis 14.40 14.39 35.4 34.9 0.0 0.0 0.0 0.0 0.0 0.5 1.0 0.0 0.0 0.0 KN162-7-15 52.923 20.382 3489 RV Wall 14.41 14.39 16.6 16.6 0.0 0.0 0.0 0.0 0.0 0.0 2.2 0.0 0.0 3.8 KN162-7-14a 52.873 20.398 3450 RV Axis 14.41 14.39 empty - - - - - - - - - - - KN162-7-14b 52.902 20.412 3420 RV Axis 14.41 14.39 33.3 33.3 0.0 0.0 0.0 0.0 0.0 0.0 4.5 0.0 0.0 2.5 KN162-7-16 52.922 20.661 4283 RV Axis 14.42 14.40 11.5 11.5 0.0 0.0 0.0 0.0 0.0 0.0 13.6 0.0 0.0 0.0 VAN7-73 52.980 20.693 3795 RV Wall 14.43 14.41 213.3 209.8 0.0 0.0 2.9 0.0 0.2 0.5 0.0 0.0 0.0 0.1 KN162-7-17 52.949 20.925 3874 RV Axis 14.43 14.41 124.1 124.1 0.0 0.0 0.0 0.0 0.0 0.0 1.0 0.0 0.0 1.8 VAN7-72 53.010 20.935 2953 RV Wall 14.43 14.41 149.7 0.0 0.0 93.7 51.2 0.7 4.3 0.0 KN162-7-19 53.050 21.376 3992 RV Wall 14.45 14.44 81.2 45.8 22.0 0.6 9.4 0.0 0.1 3.3 1.0 0.0 0.0 0.4 KN162-7-18 52.990 21.406 4507 RV Wall 14.45 14.44 76.7 76.7 0.0 0.0 0.0 0.0 0.0 0.0 0.9 0.0 0.0 0.5 VAN7-71a 53.090 21.473 3289 RV Wall 14.45 14.44 empty - - - - - - - - - - - VAN7-71b 53.075 21.473 3331 RV Wall 14.45 14.44 62.3 9.3 0.0 0.0 0.0 0.0 53.0 0.0 0.0 nd nd nd AG22-07 53.028 21.856 3300 RV Axis 14.46 14.46 1.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 nd nd nd VAN7-70 53.040 21.978 3968 RV Wall 14.47 14.47 233.7 233.7 0.0 0.0 0.0 0.0 0.0 0.0 0.9 0.3 0.0 1.5 KN162-7-20 53.039 22.177 4246 RV Axis 14.47 14.47 35.1 35.1 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.0 0.0 5.0 AG22-08 53.105 22.197 3690 RV Wall 14.47 14.47 26.0 26.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 nd nd nd VAN7-69 53.140 22.451 3890 RV Wall 14.48 14.48 150.5 150.5 0.0 0.0 0.0 0.0 0.0 0.0 3.0 1.1 0.0 2.1 KN162-7-21 53.035 22.468 3787 RV Axis 14.48 14.48 138.6 138.6 0.0 0.0 0.0 0.0 0.0 0.0 3.3 0.0 0.0 0.4 KN162-7-23 53.173 22.574 3658 RV Wall 14.49 14.49 136.4 135.8 0.0 0.0 0.0 0.0 0.0 0.6 0.9 0.0 0.0 0.7 KN162-7-22 53.109 22.647 3875 RV Axis 14.49 14.49 175.1 175.1 0.0 0.0 0.0 0.0 0.0 0.0 1.6 0.0 0.0 2.4 VAN7-68 53.230 22.791 3353 RV Wall 14.49 14.49 70.2 65.5 0.0 0.0 0.2 0.0 4.4 0.2 1.7 0.4 0.0 0.9 KN162-7-24 53.158 22.852 3290 RV Axis 14.49 14.49 178.3 175.8 0.0 0.0 0.0 0.0 0.0 2.5 2.9 0.0 0.0 2.8 AG22-09 53.140 22.880 3860 RV Axis 14.49 14.49 6.0 6.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 nd nd nd VAN7-67 53.290 23.019 3775 RV Wall 14.50 14.50 27.7 26.9 0.0 0.0 0.2 0.0 0.6 0.0 0.0 0.4 0.0 1.1 KN162-7-25 53.173 23.117 3995 RV Axis 14.50 14.50 53.3 53.3 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.2 VAN7-66a 53.277 23.271 3896 RV Wall 14.51 14.51 empty - - - - - - - - - - - VAN7-66b 53.277 23.271 3905 RV Wall 14.51 14.51 228.2 228.2 0.0 0.0 0.0 0.0 0.0 0.0 2.6 2.7 0.0 1.3 KN162-7-26 53.214 23.358 3325 RV Axis 14.51 14.51 56.8 56.8 0.0 0.0 0.0 0.0 0.0 0.0 2.6 0.0 0.0 2.3 AG22-10 53.302 23.500 3600 RV Wall 14.52 14.52 empty - - - - - - - - - - - AG22-11 53.255 23.637 4100 RV Wall 14.52 14.52 empty - - - - - - - - - - - AG22-12 53.393 23.692 3650 RV Wall 14.52 14.52 36.95 33.8 0.0 0.0 3.0 0.0 0.2 0.0 0.0 nd nd nd AG22-13 53.408 24.758 3850 RV Axis 14.55 14.55 25.9 25.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 nd nd nd Orthogonal Supersegment Averages 4044.8 85.5% 4.2% 3.2% 5.0% 0.0% 1.6% 0.4% 2% 1% 0% 2% All Dredge Averages 9102.3 65.2% 19.4% 2.0% 5.6% 0.1% 4.8% 2.8% 3.4% 0.8% 0.0% 3.9% 1) Dredged rock lithologies - mass of rock in kilograms which falls into each general lithologic classification 2) Basalt statistics - compiled sample specific descriptions averaged for each dredge and presented as percentages "3) Dredge labels represent expeditions Knorr 162-Legs 7&9 (KN162), Melville-Vancouver Leg 7 (VAN7), and Agulhas 22 (AG22); dredges are generally listed according to Longitude ([deg]E) from east to west; PS4 samples are not included here due to lack of statis" 4) Depth represent meters below sea level as determined when the dredge hit bottom 5) Full spreading rate calculated at http://www.ldeo.columbia.edu/users/menke/plates.html "6) ESR calculated following the method of Abelson&Agnon (1997), with ESR azimuth measured by hand." "7) Dredge KN162-7-01 and KN162-7-27 are both located on the Shaka Ridge (transform trace), and thus are not included in statistics; GC-1 recovered < 1 kg of sand and rock and thus is not included in statistics" 8) Averages for dredged lithologies represent percent lithology of 'non-empty' dredges; averages for basalt statistics are averaged percentages of dredges recovering basalt "# - Descriptive information (i.e. phenocryst %, vesicle %) was reviewed at sea by the authors to ensure consistency and minimize error" n.d. = not determined