Table T5. Alteration modes identified in thin section, Hole U1415I.
| Olivine alteration relative proportions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unit |
Number of samples |
Igneous mode |
Altered
(%) |
Serpentine (%) |
Clay minerals (%) |
Amphibole (%) |
Talc (%) |
Chlorite (%) |
Other (%) |
|||
| I | 6 | 8 | 100 | 1 | 13 | 33 | 13 | 38 | 2 | |||
| II | 8 | 14 | 60 | 38 | 11 | 20 | 29 | 1 | 1 | |||
| Clinopyroxene alteration relative proportions | ||||||||||||
| Unit |
Number of samples |
Igneous mode |
Altered (%) |
Pale amphibole (%) |
Clay minerals (%) |
Green amphibole (%) |
Secondary clinopyroxene (%) |
Chlorite (%) |
Other (%) |
|||
| I | 6 | 29 | 34 | 2 | 6 | 56 | — | 22 | 14 | |||
| II | 8 | 23 | 30 | 58 | 1 | 29 | — | 7 | 5 | |||
| Orthopyroxene alteration relative proportions | ||||||||||||
| Unit |
Number of samples |
Igneous mode |
Altered (%) |
Pale and green amphibole (%) |
Talc (%) |
Chlorite (%) |
Serpentine (%) |
Clay minerals (%) |
Other (%) |
|||
| I | 6 | 4 | 49 | 17 | 59 | 7 | — | 14 | 2 | |||
| II | 8 | 9 | 40 | 75 | 12 | 4 | — | 8 | — | |||
| Plagioclase alteration relative proportions | ||||||||||||
| Unit |
Number of samples |
Igneous mode |
Altered (%) |
Amphibole (%) |
Epidote/ Clinozoisite (%) |
Chlorite (%) |
Clay |
Prehnite (%) |
Garnet (%) |
Secondary plagioclase (%) |
Zeolite (%) |
Carbonate (%) |
| I | 6 | 63 | 34 | 1 | — | 15 | 2 | 39 | — | 35 | 8 | — |
| II | 8 | 65 | 9 | 1 | 1 | 28 | 1 | 57 | <1 | 5 | 6 | <1 |
| Overall alteration and relative proportions of alteration minerals | ||||||||||||
| Unit |
Number of samples |
Altered (%) |
Amphibole (%) |
Chlorite (%) |
Prehnite (%) |
Secondary plagioclase (%) |
Serpentine (%) |
Talc (%) |
Clay minerals (%) |
Zeolite (%) |
Carbonate (%) |
|
| I | 6 | 36 | 23 | 21 | 22 | 21 | <1 | 6 | 5 | 4 | — | |
| II | 8 | 19 | 43 | 10 | 14 | 1 | 13 | 12 | 5 | 1 | <1 | |
— = not identified.
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