Table T2. Example alteration log, Expedition 309/312.
| Interval (cm) | Total length (cm) | Depth to core top (mbsf) |
Ig. unit |
Background alteration (%) | Dark alteration patches (%) | Alteration halos (vein, patch, and amygdule related) (%) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dark gray | Dark green | Green | Brown | Black | Mixed | Light gray |
Light green | Dark gray | Pyrite rich | Light yellow-green | Dark green |
|||||||||||
| Exp. | Hole | Core | Section | Piece | Top | Base | ||||||||||||||||
| 312 | 1256D | 172R | 1 | 1–7 | 0 | 26 | 26 | 1255.1 | 66 | 96 | 4 | |||||||||||
| 312 | 1256D | 173R | 1 | 1–4 | 0 | 25 | 22 | 1260.6 | 66 | 88 | 10 | 2 | ||||||||||
| 312 | 1256D | 173R | 1 | 5 | 25 | 28 | 2 | — | 66 | 95 | ||||||||||||
| 312 | 1256D | 173R | 1 | 6 | 28 | 32 | 3 | — | 66 | 100 | ||||||||||||
| 312 | 1256D | 173R | 1 | 7–8 | 32 | 43 | 9 | — | 66 | 49 | 50 | |||||||||||
| 312 | 1256D | 173R | 1 | 9–24 | 43 | 136 | 79 | — | 66 | 87 | 12 | 1 | ||||||||||
| 312 | 1256D | 173R | 2 | 1–2 | 0 | 24 | 23 | — | 66 | 95 | 5 | |||||||||||
| 312 | 1256D | 174R | 1 | 1–4 | 0 | 26 | 24 | 1265.4 | 66 | 98 | 2 | |||||||||||
| 312 | 1256D | 174R | 1 | 5–8 | 26 | 43 | 14 | — | 67 | 95 | 2 | 3 | ||||||||||
| 312 | 1256D | 174R | 1 | 9 | 43 | 52 | 9 | — | 68 | 95 | 5 | |||||||||||
Notes: Ig. unit = Igneous unit in Hole 1256D, laum = laumontite, qtz = quartz, ep = epidote, py = pyrite, cp = chalcopyrite, sap = saponite, cel = celadonite, SiO2 = amorphous silica, FeOx = iron oxyhydroxides, carb = calcium carbonate, anh = anhydrite, chl/sm = chlorite/smectite, chl = chlorite. For the complete alteration logs, see 309ALT.XLS and 312ALT.XLS in “Supplementary material.”
| Interval (cm) | Amygdules or 100% recrystallized zones |
Vesicles | Glass (%) | Comments | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Exp. | Hole | Core | Section | Piece | Top | Base | % | Minerals | % | Minerals | Fresh | Altered | |
| 312 | 1256D | 172R | 1 | 1–7 | 0 | 26 | |||||||
| 312 | 1256D | 173R | 1 | 1–4 | 0 | 25 | |||||||
| 312 | 1256D | 173R | 1 | 5 | 25 | 28 | 5 | Laum, qtz, ep | |||||
| 312 | 1256D | 173R | 1 | 6 | 28 | 32 | |||||||
| 312 | 1256D | 173R | 1 | 7–8 | 32 | 43 | 1 | Qtz, laum? | |||||
| 312 | 1256D | 173R | 1 | 9–24 | 43 | 136 | |||||||
| 312 | 1256D | 173R | 2 | 1–2 | 0 | 24 | |||||||
| 312 | 1256D | 174R | 1 | 1–4 | 0 | 26 | |||||||
| 312 | 1256D | 174R | 1 | 5–8 | 26 | 43 | |||||||
| 312 | 1256D | 174R | 1 | 9 | 43 | 52 | |||||||
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