|
Core, section,
interval (cm) |
Depth
(mbsf) |
Unit
|
Lab
|
Description
|
XRD identification
|
|---|---|---|---|---|---|
| 193-1188A- | |||||
| 2R-1, 9–12 | 9.69 | 1 | SBD | Moderately vesicular rhyodacite | Opaline silica, plagioclase (augite, smectite) |
| 5R-1, 17–21 | 33.80 | 2 | RA | Sparsely plagioclase-phyric, moderately vesicular, rhyodacite | Opaline silica, plagioclase (cristobalite) |
| 5R-1, 38–40 | 33.97 | 2 | HP | Completely altered aphyric volcanic rock with perlitic texture; cores of perlite | Opaline silica/volcanic glass |
| 5R-1, 38–40 | 33.97 | 2 | HP | Completely altered aphyric volcanic rock with perlitic texture; margins of perlite | Opaline silica/volcanic glass |
| 5R-1, 38–40 | 33.97 | 2 | HP | Completely altered aphyric volcanic rock with perlitic texture; pseudomatrix between perlite kernels | Opaline silica/volcanic glass (mixed-layer clays) |
| 5R-1, 38–40 | 33.98 | 2 | SBD | Completely altered aphyric volcanic rock with perlitic texture | Opaline silica (illite, smectite, pyrite, plagioclase) |
| 5R-1, 42–45 | 34.02 | 2 | SBD | Completely altered aphyric volcanic rock with perlitic texture | Opaline silica (plagioclase, anorthite, sepiolite, K-feldspar, pyrite, smectite) |
| 7R-1, 55–58 | 48.80 | 4 | RA | Completely altered, moderately vesicular aphyric ?dacite | Cristobalite, pyrite (quartz, gypsum, illite, pyrophyllite) |
| 7R-1, 62–64 | 48.82 | 4 | SBD | Gray rock with anhydrite-pyrite veins | Cristobalite, anhydrite (pyrite, plagioclase) |
| 7R-1, 92–93 | 49.12 | 4 | SBD | Flow-banded rock with anhydrite-pyrite veins | Cristobalite (anhydrite, pyrite, plagioclase, smectite, chlorite-bearing mixed-layer, hematite) |
| 7R-1, 114–119 | 49.34 | 5 | HP | Domainal altered, aphyric volcanic rock; light gray perlitic(?) domain | Cristobalite (anhydrite, pyrite, illite, "chlorite, tridymite") |
| 7R-1, 114–119 | 49.34 | 5 | HP | Domainal altered, aphyric volcanic rock; dark gray pseudomatrix | Cristobalite, anhydrite, pyrite (mixed-layer clay, "tridymite") |
| 7R-1, 119–120 | 49.39 | 5 | SBD | Jigsaw breccia with textures replaced by anhydrite and chlorite | Anhydrite, cristobalite (pyrite, chlorite, illite) |
| 7R-1, 145–147 | 49.65 | 5 | SBD | Rock with a pseudoclastic texture | Anhydrite (cristobalite, pyrite, pyrophyllite, quartz) |
| 7R-2, 39–41 | 50.09 | 6 | SBD | Completely altered hydrofractured volcanic rock | Cristobalite (anhydrite, pyrite, chlorite, illite, barite) |
| 7R-2, 51–53 | 50.21 | 6 | SBD | Completely altered hydrofractured volcanic rock | Anhydrite, cristobalite (pyrite, quartz, illite, barite) |
| 8R-1, 13–17 | 58.03 | 6 | HP | Domainal altered, perlitic volcanic rock; white, remnant perlite | Cristobalite (tridymite, pyrite, mixed-layer clays, "anhydrite") |
| 8R-1, 13–17 | 58.03 | 6 | HP | Domainal altered, perlitic volcanic rock; dark gray pseudomatrix | Cristobalite, pyrite, (tridymite, mixed-layer clays, "anhydrite") |
| 8R-1, 13–17 | 58.03 | 6 | HP | Domainal altered, perlitic volcanic rock; bulk rock | Cristobalite (tridymite, pyrite, mixed-layer clays, "anhydrite") |
| 8R-1, 66–70 | 58.56 | 6 | HP | Completely altered hydrofractured, flow-banded volcanic rock | Cristobalite (chlorite, "pyrite, illite, anatase) |
| 8R-1, 66–70 | 58.58 | 6 | SBD | Completely altered hydrofractured volcanic rock | Cristobalite (anhydrite, pyrite, chlorite, illite, barite) |
| 8R-1, 108–112 | 58.98 | 6 | KL | Completely altered hydrofractured volcanic rock | Cristobalite (chlorite, smectite, anhydrite, pyrite) |
| 8R-1, 124–127 | 59.14 | 6 | SBD | Completely altered hydrofractured volcanic rock | Cristobalite (anhydrite, pyrite, illite, chlorite, barite) |
| 8R-1, 147–148 | 59.37 | 7 | SBD | Completely bleached vesicular volcanic rock with silification | Cristobalite, anhydrite (pyrite, quartz, illite, barite) |
| 8R-2, 18–20 | 59.6 | 7 | RA | Pervasively bleached, vesicular volcanic rock | Cristobalite (gypsum, pyrite, illite, chlorite, mixed-layer clays) |
| 9R-1, 5–9 | 67.65 | 7 | KL | Completely bleached vesicular volcanic rock with silification | Cristobalite, anhydrite, quartz (pyrophyllite, pyrite) |
| 9R-1, 13–14 | 67.73 | 7 | SBD | Completely bleached vesicular volcanic rock with silification | Cristobalite, anhydrite, quartz (pyrophyllite, pyrite, barite) |
| 9R-1, 67–70 | 68.27 | 8 | SBD | Completely altered hydrofractured volcanic rock | Cristobalite (pyrophyllite, pyrite, anhydrite, barite) |
| 9R-1, 130–135 | 68.9 | 8 | HP | Completely altered hydrofractured volcanic rock | Cristobalite, anhydrite (quartz, pyrite, pyrophyllite, paragonite, gypsum "halite, anatase") |
| 9R-1, 137–140 | 69.0 | 8 | RA | Pervasively bleached, vesicular volcanic rock | Cristobalite, anhydrite (gypsum, pyrophyllite, quartz) |
| 9R-2, 79–81 | 69.89 | 8 | SBD | Completely altered hydrofractured volcanic rock | Cristobalite (anhydrite, quartz, pyrite, illite) |
| 10R-1, 35–37 | 77.65 | 8 | SBD | Completely altered hydrofractured volcanic rock | Quartz, cristobalite (pyrophyllite, barite, pyrite) |
| 10R-1, 39–43 | 77.69 | 8 | KL | Completely altered hydrofractured volcanic rock | Quartz (cristobalite, anhydrite, pyrophyllite) |
| 11R-1, 20–26 | 87.1 | 9 | HP | Domainal altered, gray to white, massive volcanic rock; white margin | Cristobalite, quartz, anhydrite (tridymite, illite, gypsum, "?pyrophyllite") |
| 11R-1, 20–26 | 87.1 | 9 | HP | Domainal altered, gray to white, massive volcanic rock; gray central part | Cristobalite, plagioclase, pyrite (quartz, anhydrite, rutile, "chlorite?, mixed-layer clays") |
| 11R-1, 35–38 | 87.25 | 9 | SBD | Completely bleached vesicular volcanic rock with silification | Cristobalite (plagioclase, quartz, anhydrite, pyrite, chlorite) |
| 11R-1, 56–57 | 87.46 | 9 | SBD | Completely bleached vesicular volcanic rock with silification | Cristobalite, plagioclase, quartz (pyrite, anhydrite, illite, barite) |
| 11R-1, 99–100 | 87.9 | 9 | RA | Completely altered, bleached, sparsely vesicular volcanic rock | Cristobalite, pyrite (gypsum, anhydrite, quartz, illite) |
| 12R-1, 51–52 | 97.11 | 10 | SBD | Completely altered hydrofractured perlitic and flow-banded rock | Quartz, cristobalite, anhydrite (pyrophyllite, pyrite) |
| 12R-1, 58–61 | 97.18 | 10 | KL | Completely altered hydrofractured perlitic and flow-banded rock | Cristobalite, plagioclase (chlorite, illite, quartz, anhydrite) |
| 12R-1, 69–70 | 97.29 | 10 | SBD | Completely altered hydrofractured perlitic and flow-banded rock | Cristobalite (anhydrite, pyrite, illite, chlorite, chlorite-bearing mixed-layer, smectite, barite) |
| 12R-1, 108–111 | 97.68 | 10 | KL | Completely altered hydrofractured perlitic and flow-banded rock | Cristobalite, plagioclase (quartz, chlorite, illite, pyrite) |
| 12R-1, 117–118 | 97.77 | 10 | SBD | Completely altered hydrofractured perlitic and flow-banded rock | Cristobalite, plagioclase (quartz, pyrite, anhydrite, barite) |
| 12R-1, 128–140 | 97.9 | 10 | RA | Completely altered, bleached, sparsely vesicular volcanic rock | Cristobalite, plagioclase (quartz, pyrite, chlorite, illite) |
| 12R-2, 20–24 | 98.28 | 10 | KL | Completely altered hydrofractured perlitic and flow-banded rock | Cristobalite, plagioclase (quartz, chlorite, illite, pyrite) |
| 12R-2, 48–51 | 98.55 | 10 | HP | Completely altered flow-banded rock; light gray layers | Cristobalite, plagioclase (quartz "tridymite, pyrite, chlorite") |
| 12R-2, 48–51 | 98.55 | 10 | HP | Completely altered flow-banded rock; dark gray layers | Cristobalite, plagioclase (quartz "chlorite") |
| 12R-2, 48–51 | 98.56 | 10 | SBD | Completely altered hydrofractured perlitic and flow-banded rock | Cristobalite, plagioclase (quartz, pyrite, anhydrite, barite, chlorite) |
| 13R-1, 9–12 | 106.39 | 11 | SBD | Completely altered, pervasively bleached volcanic rock | Cristobalite, plagioclase (quartz, pyrite, anhydrite, barite, chlorite-bearing mixed-layer) |
| 13R-1, 50–53 | 106.8 | 11 | RA | Completely altered, bleached, sparsely vesicular volcanic rock | Quartz, anhydrite (gypsum, pyrite, illite, pyrophyllite) |
| 14R-1, 4–10 | 116.04 | 12 | SBD | Completely altered volcaniclastic, granule to pebble breccia. | Quartz (illite, pyrite) |
| 14R-1, 44–45 | 116.44 | 13 | SBD | Pervasively bleached hydrofractured volcanic rock | Quartz (cristobalite, anhydrite, pyrite, illite, talc) |
| 14R-1, 55–60 | 116.55 | 13 | KL | Pervasively bleached hydrofractured volcanic rock | Quartz, anhydrite (pyrophyllite, gypsum) |
| 14R-1, 86–89 | 116.86 | 13 | HP | Pervasively bleached hydrofractured volcanic rock; average rock | Anhydrite (quartz, pyrite, gypsum, illite?, pyrophyllite?, mixed-layer clays?) |
| 14R-1, 86–89 | 116.86 | 13 | HP | Pervasively bleached hydrofractured volcanic rock; white pseudoclastic domains | Quartz (anhydrite, anatase, paragonite?, pyrophyllite?, "pyrite, halite") |
| 14R-1, 92–93 | 116.92 | 13 | SBD | Pervasively bleached hydrofractured volcanic rock | Quartz, anhydrite (pyrite, illite, talc) |
| 14R-1, 105–108 | 117.27 | 14 | HP | Completely altered volcaniclastic breccia; cream-colored clast | Quartz, anhydrite (gypsum, paragonite?, mixed-layer clays? "tridymite, halite") |
| 14R-1, 105–108 | 117.27 | 14 | HP | Completely altered volcaniclastic breccia; bulk rock | Quartz, anhydrite (gypsum, paragonite?, mixed-layer clays?, "illite?, tridymite, halite") |
| 14R-1, 105–108 | 117.29 | 14 | SBD | Completely altered volcaniclastic breccia | Quartz (anhydrite, illite) |
| 15R-1, 14–21 | 125.84 | 15 | SBD | Anhydrite vein | Anhydrite |
| 15R-1, 56–59 | 126.26 | 16 | KL | Completely bleached and silicified, vesicular volcanic rock | Quartz, plagioclase (cristobalite, anhydrite, chlorite, illite-bearing mixed-layer) |
| 15R-1, 76–80 | 126.46 | 16 | SBD | Completely bleached and silicified, vesicular volcanic rock | Quartz (illite, pyrite, anhydrite) |
| 15R-1, 80–81 | 126.50 | 16 | RA | Crustiform anhydrite-pyrite vein | Quartz, pyrite, plagioclase (gypsum, anhydrite, illite, chlorite, mixed-layer clays, cristobalite) |
| 16R-1, 77–78 | 136.17 | 17 | SBD | Completely silicified, sparsely vesicular volcanic rock | Quartz (anhydrite, plagioclase, illite, pyrite, chlorite) |
| 16R-1, 95–98 | 136.35 | 17 | SBD | Completely silicified, sparsely vesicular volcanic rock | Quartz (anhydrite, plagioclase, illite, chlorite) |
| 16R-1, 139–143 | 136.79 | 18 | HP | Massive gray volcanic rock with anhydrite-vein; white vein | Quartz, anhydrite (illite "chlorite, gypsum, rutile") |
| 16R-1, 139–143 | 136.79 | 18 | HP | Massive gray volcanic rock with anhydrite-vein; gray groundmass | Quartz, plagioclase (pyrite "chlorite") |
| 16R-2, 12–15 | 136.98 | 18 | SBD | Gray-green finely laminated, strongly silicified volcanic rock | Quartz, plagioclase (pyrite, chlorite, anhydrite) |
| 16R-2, 40–43 | 137.26 | 18 | SBD | Gray-green finely laminated, strongly silicified volcanic rock | Quartz, plagioclase (pyrite, chlorite, anhydrite) |
| 16R-2, 51–52 | 137.37 | 18 | SBD | Gray-green finely laminated, strongly silicified volcanic rock | Quartz, plagioclase (chlorite, anhydrite, pyrite) |
| 16R-2, 68–69 | 137.54 | 18 | SBD | Gray-green finely laminated, strongly silicified volcanic rock | Quartz, plagioclase (chlorite, pyrite, anhydrite) |
| 17R-1, 24–28 | 145.34 | 19 | HP | Silicified, bleached volcanic rock | Quartz, anhydrite (pyrite, illite?, mixed-layer clays, gypsum "chlorite") |
| 17R-1, 38–41 | 145.48 | 19 | KL | Silicified, bleached volcanic rock | Quartz (anhydrite, pyrite, chlorite, illite-bearing mixed-layer) |
| 17R-1, 90–93 | 146.00 | 19 | SBD | Silicified, bleached volcanic rock | Quartz (illite, pyrite, anhydrite, chlorite) |
| 17R-1, 123–124 | 146.33 | 19 | SBD | Silicified, bleached volcanic rock | Quartz (anhydrite, illite) |
| 18R-1, 28–29 | 154.98 | 19 | SBD | Silicified, bleached volcanic rock | Quartz, anhydrite (magnetite, illite) |
| 18R-1, 87–97 | 155.57 | 20 | SBD | Silicified and bleached moderately vesicular volcanic rock | Quartz (anhydrite) |
| 19R-1, 41–46 | 164.71 | 21 | HP | Silicified volcanic rock | Quartz (cristobalite, plagioclase, chlorite?, mixed-layer clays? "tridymite") |
| 19R-1, 51–57 | 164.81 | 21 | SBD | Silicified volcanic rock | Cristobalite, plagioclase (quartz, chlorite) |
| 19R-1, 73–76 | 165.03 | 22 | SBD | Moderately altered, vesicular volcanic rock | Cristobalite, plagioclase (chlorite) |
| 19R-1, 86–90 | 165.16 | 22 | HP | Moderately altered, vesicular volcanic rock | Cristobalite, plagioclase ("anhydrite, chlorite") |
| 20R-1, 8–12 | 173.98 | 23 | KL | Silicified, moderately chloritic magnetite-bearing volcanic rock | Cristobalite, quartz, plagioclase, chlorite-bearing mixed-layer (anhydrite, pyrite) |
| 20R-1, 46–47 | 174.36 | 23 | SBD | Silicified, moderately chloritic magnetite-bearing volcanic rock | Quartz (plagioclase, anhydrite, corrensite, magnetite, illite, pyrite) |
| 20R-1, 68–72 | 174.58 | 23 | KL | Silicified, moderately chloritic magnetite-bearing volcanic rock | Quartz, plagioclase (chlorite, pyrite) |
| 20R-1, 75–76 | 174.65 | 23 | SBD | Silicified, moderately chloritic magnetite-bearing volcanic rock | Quartz, plagioclase (magnetite, pyrite, chlorite) |
| 20R-1, 92–95 | 174.82 | 24 | SBD | Distinctive dark green silicified rock | Quartz, plagioclase (magnetite, pyrite, smectite, anhydrite, mixed-layers) |
| 20R-1, 95–102 | 174.85 | 24 | HP | Distinctive dark green silicified rock; abundant white dots | Quartz (plagioclase, pyrite) |
| 20R-1, 95–102 | 174.85 | 24 | HP | Distinctive dark green silicified rock; minor white dots | Quartz, plagioclase (pyrite "anhydrite, mixed-layer clays") |
| 20R-1, 102–103 | 174.92 | 24 | SBD | Distinctive dark green silicified rock | Quartz, plagioclase (magnetite, pyrite, corrensite, anhydrite) |
| 21R-1, 20–21 | 183.30 | 25 | SBD | Green-black rock with green clay in a silica-pyrite stockwork | Quartz (plagioclase, magnetite, corrensite, pyrite) |
| 21R-1, 43–47 | 183.53 | 25 | KL | Green-black rock with green clay in a silica-pyrite stockwork | Quartz, plagioclase (magnetite, chlorite-bearing mixed-layer) |
| 21R-1, 77–81 | 183.87 | 25 | KL | Green-black rock with green clay in a silica-pyrite stockwork | Cristobalite, plagioclase (quartz, magnetite, chlorite-bearing mixed-layer, pyrite, anhydrite) |
| 21R-1, 105–114 | 184.2 | 25 | RA | Patchy quartz, magnetite, chlorite-clay bearing rock. | Quartz, plagioclase (cristobalite, pyrite, chlorite, illite, gypsum) |
| 21R-1, 142–146 | 184.52 | 25 | KL | Green-black rock with green clay in a silica-pyrite stockwork | Cristobalite, plagioclase (quartz, chlorite-bearing mixed-layer, illite, pyrite, anhydrite) |
Notes: SBD = shipboard data, RA = postcruise data from R. Asada, HP = postcruise data from H. Paulick, KL = postcruise data from K. Lackschewitz. XRD = X-ray diffraction. The terms major (outside parenthesis), minor (inside parenthesis), and trace (inside both parenthesis and quotation marks) are applied to XRD analyses as explained in "Hydrothermal Alteration," in the "Explanatory Notes" chapter of Shipboard Scientific Party (2002) and do not imply quantitative abundances.