Table T5. Summary of basement stratigraphy and subunits recovered in Hole U1382A.
| Lith. unit |
Subunit | Depth (mbsf) | Lithology | Vesicles | Description | Groundmass alteration (%) |
|
|---|---|---|---|---|---|---|---|
| Top | Bottom | ||||||
| 1 | 1-1 | 110.00 | 110.17 | Aphyric fine-grained basalt | Nonvesicular | Massive flow | ~10 |
| 1-2 | 110.17 | 113.63 | Aphyric medium-grained basalt | Nonvesicular | Massive flow | 5–20 | |
| 1-3 | 113.71 | 116.20 | Aphyric fine- to medium-grained basalt | Nonvesicular | Massive flow | 2–10 | |
| 1-4 | 116.20 | 119.61 | Aphyric fine- to medium-grained basalt | Nonvesicular | Massive flow | 1–12 | |
| 2 | 2-1 | 119.61 | 123.20 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0.5%–3%) | Pillow flow | 0–7 |
| 2-2 | 123.26 | 123.65 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 1–5 | |
| 2-3 | 123.65 | 124.25 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 1–8 | |
| 2-4 | 124.25 | 124.57 | aphyric cryptocrystalline to glassy basalt | Sparsely vesicular (0%–1%) | Pillow flow | 0–7 | |
| 2-5 | 124.57 | 124.64 | Breccia - hyaloclastite | ||||
| 2-6 | 124.64 | 125.26 | Aphyric cryptocrystalline to fine-grained basalt | Sparsely vesicular (0.5%–3%) | Pillow flow | 6–10 | |
| 2-7 | 125.26 | 125.95 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 5–7 | |
| 2-8 | 125.95 | 126.39 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–5%) | Pillow flow | 1–6 | |
| 2-9 | 132.50 | 132.62 | Aphyric cryptocrystalline to glassy basalt | Sparsely vesicular (0%–1%) | Pillow flow | 3 | |
| 2-10 | 132.62 | 132.91 | Aphyric cryptocrystalline to fine-grained basalt | Sparsely vesicular (1%–5%) | Pillow flow | 5 | |
| 2-11 | 132.91 | 133.12 | Aphyric cryptocrystalline to fine-grained basalt | Sparsely vesicular (0%–5%) | Pillow flow | 2–5 | |
| 2-12 | 133.12 | 133.66 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 2–4 | |
| 2-13 | 133.66 | 133.73 | Breccia - hyaloclastite | ||||
| 2-14 | 133.73 | 134.74 | Aphyric cryptocrystalline to fine-grained basalt | Sparsely vesicular (0%–3%) | Pillow flow | 3–10 | |
| 2-15 | 134.74 | 135.29 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 3–4 | |
| 2-16 | 135.29 | 135.63 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–1%) | Pillow flow | 2 | |
| 2-17 | 135.63 | 142.58 | Aphyric cryptocrystalline to fine-grained basalt | Mostly nonvesicular (0%–0.5%) | Pillow flow | 0–5 | |
| 2-18 | 142.58 | 143.46 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 1–5 | |
| 3 | 3 | 143.46 | 145.17 | Aphyric medium-grained basalt | Nonvesicular | Massive flow | 1–10 |
| 4 | 4-1 | 145.17 | 145.24 | Aphyric cryptocrystalline basalt | Nonvesicular | Pillow flow | 10 |
| 4-2 | 145.24 | 145.38 | Aphyric cryptocrystalline basalt | Sparsely vesicular (3%–5%) | Pillow flow | 3–10 | |
| 4-3 | 151.70 | 151.83 | Aphyric medium/fine-grained basalt | Nonvesicular | Massive/Pillow flow | 6 | |
| 4-4 | 151.83 | 152.02 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 4 | |
| 4-5 | 152.02 | 152.55 | Aphyric cryptocrystalline to fine-grained basalt | Sparsely vesicular (0%–5%) | Pillow flow | 0–3 | |
| 4-6 | 152.55 | 152.65 | Aphyric cryptocrystalline basalt | Sparsely vesicular (3%) | Pillow flow | 2–3 | |
| 4-7 | 152.65 | 153.63 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 2–8 | |
| 4-8 | 153.63 | 154.41 | Aphyric cryptocrystalline to fine-grained basalt | Sparsely vesicular (0%–5%) | Pillow flow | 1–6 | |
| 5 | 5 | 161.30 | 173.24 | Sedimentary-plutonic-volcanic breccia | |||
| 6 | 6-1 | 173.24 | 173.38 | Plagioclase-olivine-phyric fine-grained basalt | Sparsely vesicular (3%) | Massive flow | ~1 |
| 6-2 | 173.38 | 183.10 | Plagioclase-olivine-phyric fine-grained basalt | Sparsely vesicular (0%–5%) | Massive flow | 1–6 | |
| 6-3 | 183.21 | 191.24 | Plagioclase-olivine-phyric fine-grained basalt | Sparsely vesicular (0%–5%) | Massive flow | 1–6 | |
| 7 | 7-1 | 191.24 | 191.33 | Aphyric cryptocrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 5 |
| 7-2 | 191.33 | 191.85 | Aphyric cryptocrystalline to microcrystalline basalt | Sparsely vesicular (0.5%–3%) | Pillow flow | 0–8 | |
| (7-3) | 199.70 | 200.10 | Plagioclase-olivine-phyric microcrystalline basalt | Sparsely vesicular (0.5%–5%) | Massive flow | 3 | |
| 7-4 | 200.10 | 200.33 | Aphyric cryptocrystalline basalt | Very sparsely vesicular (0%–0.5%) | Pillow flow | 0–5 | |
| 7-5 | 200.33 | 200.91 | Aphyric cryptocrystalline to microcrystalline basalt | Sparsely vesicular (0.5%–3%) | Pillow flow | 0–20 | |
| 7-6 | 200.95 | 201.44 | Aphyric cryptocrystalline to microcrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 3–4 | |
| 7-7 | 201.44 | 201.93 | Aphyric cryptocrystalline to microcrystalline basalt | Sparsely vesicular (0%–3%) | Pillow flow | 0–6 | |
| 8 | 8 | 201.93 | 202.76 | Aphyric fine- to medium-grained basalt | Mostly nonvesicular (0%–1%) | Massive flow | 6–10 |
Previous | Close | Next | Top of page