Table T6. Summary of primary and secondary mineralogy determined by thin section microscopy observation and X-ray diffraction (XRD).
| Core, section (Piece) |
Lith. unit |
Thin section |
Rock name | Grain size | Texture | Thin section | XRD | ||
|---|---|---|---|---|---|---|---|---|---|
| Primary minerals |
Secondary minerals |
Primary minerals |
Secondary minerals |
||||||
| 336-U1382A- | |||||||||
| 3R-2 (11) | 1–3 | 1 | Aphyric sparsely vesicular basalt | Medium grained | Granular to intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
FeOOH‡ Carbonate Clay |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Phillipsite Smectite/Zeolite* |
| 3R-3 (3) | 1–4 | 2 | Aphyric avesicular basalt | Medium grained | Subophitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay Palagonite Clay + FeOOH |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Celadonite Smectite/Zeolite* |
| 3R-4 (11) | 1–4 | 3 | Aphyric sparsely vesicular basalt | Medium grained | Subophitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay | Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Celadonite Zeolite (Chabazite†) |
| 4R-1 (10) | 2–2 | 4 | Aphyric avesicular basalt | Crypto- to microcrystalline | Aphyric | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay Clay + FeOOH |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
|
| 4R-3 (8) | 2–7 | 5 | Aphyric avesicular basalt | Microcrystalline | Aphyric | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay Clay + FeOOH |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine (at detection limit) |
Celadonite |
| 4R-3 (9) | 2–7 | 6 | Aphyric avesicular basalt | Fine grained | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay FeOOH Pyrite |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Celadonite |
| 5R-1 (7) | 2–9 | 7 | Aphyric sparsely vesicular basalt | Microcrystalline | Aphyric | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
FeOOH‡ Clay Zeolite |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine (at detection limit) |
|
| 5R-3 (5) | 2–15 | 8 | Aphyric sparsely vesicular basalt | Microcrystalline | Aphanitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay | Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Zeolite (Chabazite†) |
| 6R-3 (2B) | 4–1 | 9 | Aphyric avesicular basalt | Fine grained | Intersertal to ophitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay | Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
|
| 7R-1 (14) | 4–5 | 10 | Aphyric sparsely vesicular basalt | Fine grained | Subophitic to intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
FeOOH‡ Clay Zeolite |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite, olivine, and quartz (at detection limit) |
|
| 7R-2 (12) | 4–8 | 11 | Aphyric sparsely vesicular basalt | Glassy to microcrystalline | Glassy to spherulitic to variolitic | Olivine Plagioclase Fe-Ti oxide Sulfide |
Clay | Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Celadonite |
| 7R-1 (22) | 4–7 | 12 | Aphyric sparsely vesicular basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay FeOOH‡ |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Zeolite (Chabazite†) |
| 8R-1 (4) | 5 | 14 | Olivine gabbro | Coarse to medium grained | Porphyroclastic | Plagioclase Clinopyroxene Olivine Ilmenite |
Serpentine Magnetite Chlorite Tremolite Prehnite Clinozoisite Clay |
||
| 9R-1 (5) | 5 | 15 | Olivine gabbro mylonite | Medium to fine grained | Mylonitic | Olivine Plagioclase Clinopyroxene Ilmenite |
|||
| 9R-1 (12) | 5 | 16 | lherzolite | Coarse to medium grained | Coarse granular | Olivine Plagioclase Clinopyroxene Spinel Orthopyroxene |
Calcite Magnetite Serpentine Plagioclase Pyrite Manganese** |
||
| 9R-1 (14b) | 5 | 17 | Harzburgite | Coarse grained | Coarse granular | Olivine Clinopyroxene Spinel Orthopyroxene |
Serpentine Calcite Magnetite Plagioclase Manganese** |
||
| 8R-4 (6) | 5 | 18 | Harzburgite | Coarse grained | Coarse granular | Olivine Orthopyroxene Clinopyroxene Spinel |
Serpentine Calcite Manganese** |
||
| 8R-4 (3) | 5 | 19 | Olivine gabbro | Coarse grained | Porphyroclastic | Olivine Plagioclase Clinopyroxene Ilmenite |
Chlorite Sericite Magnetite |
||
| 8R-4 (8) | 5 | 20 | lherzolite | Coarse grained | Coarse granular | Olivine Orthopyroxene Clinopyroxene Spinel Plagioclase |
Serpentine Magnetite Chlorite |
||
| 9R-2 (3) | 5 | 21 | Plagioclase-phyric avesicular basalt | Crypto- to microcrystalline | Hyaloophitic to aphanitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Oxide Clay Clay + FeOOH‡ |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
|
| 9R-3 (3) | 6–2 | 22 | Plagioclase-phyric sparsely vesicular basalt | Fine grained | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay Zeolite |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Zeolite (Chabazite†) Celadonite |
| 10R-2 (10) | 6–2 | 23 | Plagioclase-phyric sparsely vesicular basalt | Crypto- to microcrystalline | Aphanitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay Clay + FeOOH‡ Pyrite |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Possible carbonate |
| 10R-3 (11) | 6–3 | 24 | Plagioclase-olivine-phyric sparsely vesicular basalt | Fine grained | Intersertal | Olivine Plagioclase Fe-Ti oxide Sulfide |
Clay Clay + FeOOH‡ Carbonate |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Zeolite (Chabazite†) |
| 12R-1 (18) | 7–5 | 25 | Aphyric sparsely vesicular basalt | Microcrystalline to fine grained | Intersertal | Olivine Plagioclase Fe-Ti oxide Sulfide |
Clay Clay + FeOOH‡ Pyrite |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
|
| 12R-1 (21) | 7–5 | 26 | Aphyric sparsely vesicular basalt | Fine grained | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay Clay + FeOOH‡ |
Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Phillipsite |
| 12R-3 (4) | 8 | 27 | Aphyric avesicular basalt | Fine to medium grained | Subophitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay + FeOOH‡ | Mixed plagioclase (mostly anorthite) Mixed diopside and augite olivine |
Celadonite Smectite/Zeolite* Zeolite (Chabazite†) |
| 5R-1 (22) | 2–13 | NA | Forsterite | Phillipsite-Na celadonite |
|||||
* = Potential smectite, but smectite/zeolite regions are overlapping and unresolvable. † = tentatively identified as chabazite (Ca-bearing zeolite). ‡ = iron oxyhydroxide. ** = manganese oxides and/or oxyhydroxide.
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