Table T54. Relative differences in log response between structurally different rock types described from Leg 206 and Expedition 309.
| Lithology | Depth range (mbsf) |
Rock type | Natural gamma ray (gAPI) |
Resistivity (deep) (Ωm) |
Density (g/cm3) |
Neutron porosity (%) |
Compressional velocity (km/s) |
|---|---|---|---|---|---|---|---|
| Lava pond | 316–338 | Massive basalt | 2.0–3.8 | 40–100 | 2.9 | 5–7 | 5.5–5.8 |
| Inflated flows | 364–375 | Pillow lava | 5.3–6.0 | 5–10 | 2.3–2.6 | 23–36 | 4.2–4.6 |
| Inflated flows | 472–490 | Massive basalt | 1.9–3.0 | 50–110 | 2.8–2.9 | 4–11 | 5.4–5.7 |
| Sheet and massive flows | 580–632 | Sheet flow | 3.0–4.3 | 21–82 | 2.6–2.9 | 10–28 | 4.7–5.5 |
| Sheet and massive flows | 738–784 | Sheet flow | 3.0–9.0 | 1–4 | 2.6–2.8 | 13–23 | 4.5–5.1 |
| Sheet and massive flows | 819–835 | Massive basalt | 1.5–3.0 | 110–290 | 2.7–2.9 | 6–10 | 5.6–5.8 |
| Sheet and massive flows | 850–870 | Sheet flow | 2.0–9.5 | 11–21 | 2.4–2.8 | 13–27 | 4.6–5.1 |
| Upper dikes | 1120–1140 | Massive basalt | 1.5–2.0 | 310–800 | 2.8–2.9 | 6–10 | 5.8–6.2 |
Notes: Demonstrated in eight different sections of Hole 1256D. Well-logging data were averaged to 10 m running averages.
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