Table T1. Analyzed samples, Hole 1256D. (See table notes.)
| Core, section, interval (cm) |
Depth (mbsf) |
Unit | Lithology | Rock name and basalt texture type |
Phenocryst assemblages for basalt |
Igneous mineral assemblages for gabbro |
Secondary mineral assemblage |
EPMA | XRF and ICP-MS |
|---|---|---|---|---|---|---|---|---|---|
| 312-1256D- | |||||||||
| 172R-1,12–14 | 1255.20 | 66 | Sheeted dike | Type 3 basalt | Pl, Cpx | DBM, Chl | X | ||
| 174R-1, 32–34 | 1265.71 | 68 | Sheeted dike | Type 3 basalt | Pl, Cpx | DBM, Chl | X | X | |
| 174R-1, 64–67 | 1266.03 | 68 | Sheeted dike | Type 4 basalt | Aphyric | DBM, Chl | X | ||
| 176R-1, 21–24 | 1276.29 | 69 | Sheeted dike | Type 3 basalt | Pl, Cpx | DBM, Chl | X | X | |
| 178R-1, 0–3 | 1285.70 | 73 | Sheeted dike | Type 3 basalt | Pl | DBM, Chl | X | X | |
| 182R-1, 12–15 | 1305.01 | 73 | Sheeted dike | Type 4 basalt | Aphyric | DBM, Chl, Ox | X | ||
| 184R-1, 39–41 | 1305.15 | 74 | Sheeted dike | Type 4 basalt | Pl, Cpx | DBM, Chl, Ox | X | ||
| 186R-1, 33–36 | 1319.82 | 75A | Sheeted dike | Type 4 basalt | Aphyric | DBM, Chl, Ox, Amp | X | ||
| 193R-1, 5–8 | 1353.10 | 78 | Granoblastic dike | Type 6 metabasalt | Aphyric | DBM, Ox, Amp | X | X | |
| 194R-1, 29–33 | 1358.19 | 78 | Granoblastic dike | Type 7 metabasalt | Pl | DBM, Ox, Amp, Opx | X | X | |
| 196R-1, 43–46 | 1364.13 | 78 | Granoblastic dike | Type 7 metabasalt | Pl | Chl, Ox, Amp, Cpx, Opx | X | X | |
| 198R-1, 0–5 | 1369.00 | 78 | Granoblastic dike | Type 6 metabasalt | Aphyric | DBM, Ox, Amp | X | ||
| 198R-1, 50–54 | 1369.50 | 78 | Granoblastic dike | Type 7 metabasalt | Aphyric | DBM, Chl, Ox, Amp, Cpx, Opx | X | ||
| 202R-1, 5–8 | 1372.80 | 79 | Granoblastic dike | Type 7 metabasalt | Aphyric | DBM, Ox, Amp, Cpx, Opx | X | ||
| 203R-1, 6–10 | 1374.89 | 80A | Granoblastic dike | Type 7 metabasalt | Pl, Cpx | Amp, Ox, Cpx, Opx, Qtz | X | ||
| 204R-1, 0–4 | 1377.30 | 80A | Granoblastic dike | Type 7 metabasalt | Aphyric | Amp, Ox, Cpx, Opx | X | ||
| 212R-1, 20–23 | 1404.30 | 80A | Granoblastic dike | Type 7 metabasalt | Aphyric | Chl, Amp, Ox, Cpx, Opx | X | ||
| 214R-1, 19–21 | 1411.10 | 81 | Gabbro 1 | Opx-bearing ol gabbro | Pl, Cpx, Ol, Opx, Ox | Amp, Tlc, Id | X | ||
| 214R-2, 24–27 | 1412.60 | 83 | Gabbro 1 | Disseminated oxide gabbro | Pl, Cpx, Ox | Chl, Amp, Ox | X | X | |
| 214R-2, 78–81 | 1413.13 | 85 | Gabbro 1 | Disseminated oxide gabbro | Pl, Cpx, Ol, Ox | Chl, Amp, Ox, Ep, Id | X | ||
| 214R-3, 18–21 | 1413.99 | 85 | Gabbro 1 | Disseminated oxide ol gabbro | Pl, Cpx, Ox | Amp, Ox, Id, Ab | X | ||
| 215R-1, 20–23 | 1415.92 | 85 | Gabbro 1 | Disseminated oxide ol gabbro | Pl, Cpx, Ol, Opx, Ox | Amp, Chl, Ox, Ep, Id, Ab | X | X | |
| 215R-2, 56–59 | 1417.69 | 86A | Gabbro 1 | Disseminated oxide ol gabbro | Pl, Cpx, Ox | Amp, Ox, Id, Ab | X | X | |
| 216R-1, 72–75 | 1418.62 | 86A | Gabbro 1 | Ol gabbro | Pl, Cpx | Amp, Ox, Id, Tlc | X | ||
| 216R-1, 138–142 | 1419.19 | 86 | Gabbro 1 | Ol gabbro | Pl, Cpx | Chl, Amp, Ox | X | X | |
| 217R-1, 94–97 | 1422.54 | 88 | Gabbro 1 | Gabbro | Pl, Cpx | Amp, Ox, Id, Ab | X | ||
| 218R-1, 1–3 | 1430.00 | 88 | Gabbro 1 | Gabbro | Pl, Cpx | Amp, Ox, Cal, Zeo, Ant, Ab | X | ||
| 219R-1, 5–8 | 1430.05 | 88 | Gabbro 1 | Opx-bearing ol gabbro | Pl, Cpx, Ol, Opx | Amp, Ox, Id | X | X | |
| 221R-1, 61–64 | 1440.21 | 88 | Gabbro 1 | Opx-bearing gabbro | Pl, Cpx | Amp, Ox, Ab | X | ||
| 222R-1, 73–78 | 1445.33 | 88 | Gabbro 1 | Opx-bearing ol gabbro | Pl, Cpx, Ol | Amp, Ox, Id, Tlc | X | X | |
| 222R-2, 60–63 | 1446.70 | 88 | Gabbro 1 | Opx-bearing ol gabbro | Pl, Cpx, Ol, Opx | Amp, Ox, Id | X | X | |
| 223R-1, 8–12 | 1449.37 | 88 | Gabbro 1 | Opx-bearing ol gabbro | Pl, Cpx, Ol, Opx | Amp, Ox, Id, Cal | X | X | |
| 223R-1, 88–91 | 1450.18 | 88 | Gabbro 1 | Opx-bearing ol gabbro | Pl, Cpx, Ol, Opx | Amp, Ox, Id, Tlc | X | ||
| 223R-2, 133–137 | 1452.11 | 89A | Gabbro 1 | Ol gabbronorite | Pl, Cpx, Ol, Opx, Ox | Amp, Ox | X | X | |
| 226R-1, 0–4 | 1463.90 | 90A | Upper dike screen | Type 8 metabasalt | Aphyric | Amp, Ox, Cpx, Opx | X | ||
| 227R-1, 72–76 | 1469.21 | 90A | Upper dike screen | Type 8 metabasalt | Aphyric | Amp, Ox, Cpx, Opx | X | ||
| 227R-2, 50–59 | 1470.51 | 90A | Upper dike screen | Type 8 metabasalt | Aphyric | Amp, Ox, Cpx, Opx | X | ||
| 230R-1, 19–21 | 1483.19 | 90A | Gabbro 2 | Disseminated oxide opx-bearing gabbro | Pl, Cpx, Opx, Ox | Amp, Ox | X | ||
| 230R-1, 81–84 | 1483.81 | 91A | Gabbro 2 | Disseminated oxide gabbro | Pl, Cpx, Opx, Ox | Amp, Ox | X | ||
| 230R-1, 139–142 | 1484.38 | 92A | Gabbro 2 | Gabbronorite | Pl, Cpx, Opx | Amp, Ox | X | ||
| 230R-2, 32–36 | 1484.58 | 92A | Gabbro 2 | Gabbronorite | Pl, Cpx, Opx | Amp, Ox | X | ||
| 230R-2, 104–109 | 1485.54 | 92A | Gabbro 2 | Gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox | X | X | |
| 231R-1, 19–22 | 1487.90 | 92A | Gabbro 2 | Disseminated oxide gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox | X | ||
| 231R-2, 35–39 | 1489.54 | 92A | Gabbro 2 | Disseminated oxide gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox | X | ||
| 231R-2, 95–98 | 1490.14 | 92A | Gabbro 2 | Disseminated oxide gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox, Id | X | ||
| 231R-3, 59–63 | 1491.15 | 92A | Gabbro 2 | Disseminated oxide ol-bearing gabbronorite | Pl, Cpx, Ol, Opx, Ox | Amp, Ox, Id, Tlc | X | X | |
| 231R-3, 123–127 | 1491.79 | 92A | Gabbro 2 | Disseminated oxide gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox, Id, Tlc | X | ||
| 231R-4, 70-74 | 1492.63 | 92A | Gabbro 2 | Opx-bearing ol gabbro | Pl, Cpx, Ol, Opx, Ox | Amp, Ox, Id, Tlc | X | ||
| 231R-4, 137-141 | 1493.30 | 92A | Gabbro 2 | Ol gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox | |||
| 232R-1, 36-39 | 1493.26 | 92A | Gabbro 2 | Disseminated oxide gabbronorite | Pl, Cpx, Ol, Opx, Ox | Amp, Ox, Id, Tlc | X | ||
| 232R-1, 78-82 | 1493.68 | 92A | Gabbro 2 | Disseminated oxide gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox, Id | X | ||
| 232R-2, 10-14 | 1494.08 | 92A | Gabbro 2 | Disseminated oxide gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox, Id | X | ||
| 232R-2, 73-76 | 1494.71 | 93 | Gabbro 2 | Disseminated oxide ol gabbronorite | Pl, Cpx, Opx, Ox | Amp, Ox, Id | X | ||
| 233R-1, 4-7 | 1497.50 | 94 | Lower dike screen | Type 8 metabasalt | Cpx | Cpx, Opx, Pl, Ox, Amp | X | ||
| 234R-1, 1-2 | 1502.50 | 94 | Lower dike screen | Type 8 metabasalt | Pl | Cpx, Opx, Pl, Ox, Amp | X | X | |
| 234R-1, 7-9 | 1502.57 | 94 | Lower dike screen | Type 8 metabasalt | Pl | Cpx, Opx, Pl, Ox, Amp | X | X | |
Notes: For basalt texure type, basalt is classified according to Koepke et al. (2008) and the “Site 1256” chapter. EPMA = JXA-8600SX EPMA at the Graduate School of Science and Technology, Niigata University. XRF = X-ray fluorescence, ICP-MS = inductively coupled plasma–mass spectrometry. Opx = orthopyroxene, Ol = olivine, Pl = plagioclase, Cpx = clinopyroxene, Ox = Fe-Ti oxide, DBM = dusty brown material, Chl = chlorite, Amp = amphibole, Qtz = quartz, Tlc = talc, Id = iddingsite, Ep = epidote, Ab = albite, Zeo = zeolite, Ant = anthophyllite, Cal = calcite.
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