Table T6. Summary of primary and secondary mineralogy determined by thin section microscopy observation and XRD.
| Core, section (Piece) |
Lith. unit |
Thin section |
Rock name | Grain size | Texture | Thin section | XRD | Total alteration (%) |
||
|---|---|---|---|---|---|---|---|---|---|---|
| Primary minerals |
Secondary minerals |
Primary minerals |
Secondary minerals |
|||||||
| 336-U1383C- | ||||||||||
| 2R-1 (7) | 1-1 | Phillipsite (Na) Calcite |
||||||||
| 2R-2 (3) | 1-1 | 28 | Sparsely plagioclase-olivine-phyric basalt, avesicular | Glassy to microcrystalline | Hyalophytic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Glass |
Zeolite Palagonite |
Mixed plagioclase, diopside/augite | 15 | |
| 3R-3 (7) | 1-1 | 29 | Sparsely plagioclase-olivine-phyric basalt | Microcrystalline to fine grained | Hyalophytic to fine grained | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay Carbonate Zeolite |
Mixed plagioclase, diopside/augite | 7.2 | |
| 3R-1 (2) | 1-1 | 30 | Avesicular sparsely plagioclase-phyric basalt | Microcrystalline | Hyalophytic | Olivine Plagioclase Clinopyroxene |
Clay FeOOH Zeolite |
Mixed plagioclase, diopside/augite | 39 | |
| 3R-2 (5) | 1-1 | 31 | Sparsely plagioclase-olivine-phyric basalt | Microcrystalline | Porphyritic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay FeOOH |
Mixed plagioclase, diopside/augite, olivine | 10 | |
| 5R-1 (6) | 1-5 | 32 | Sparsely plagioclase-olivine-phyric basalt | Cryptocrystalline to microcrystalline | Hyalophytic to trachytic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay | Mixed plagioclase, diopside/augite, olivine | 4 | |
| 5R-1 (11) | 1-5 | 33 | Sparsely plagioclase-olivine-phyric basalt | Microcrystalline | Hyalophytic to trachytic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay Zeolite |
10 | ||
| 6R-1 (17) | 1-7 | 34 | Sparsely plagioclase-olivine-phyric avesicular basalt (chilled margin) | Glassy to microcrystalline | Hyalophitic to aphanitic to intersertal | Plagioclase Clinopyroxene Fe-Ti oxide Sulfide Glass |
Clay Zeolite |
Mixed plagioclase, diopside/augite | 23.5 | |
| 6R-1 (7) | 1-7 | 35 | Sparsely plagioclase-olivine-phyric avesicular basalt (chilled margin) | Glassy to microcrystalline | Hyalophitic to aphanitic to intersertal | Plagioclase Fe-Ti oxide Sulfide Glass |
Clay | 5 | ||
| 7R-2 (8) | 1-7 | 36 | Sparsely plagioclase-olivine-phyric sparsely vesicular basalt | Micro- to cryptocrystalline | Intersertal | Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay FeOOH |
Mixed plagioclase, diopside/augite, olivine | 5 | |
| 7R-2 (16) | 1-9 | 38 | Moderately plagioclase-olivine-phyric sparsely vesicular basalt | Micro- to cryptocrystalline | Intersertal | Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay Zeolite |
Mixed plagioclase, diopside/augite | 35.5 | |
| 9R-3 (10) | 2-1 | 39 | Moderately plagioclase-olivine-phyric sparsely vesicular basalt | Microcrystalline | Intersertal | Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay Zeolite |
Mixed plagioclase, diopside/augite | 18 | |
| 9R-4 (9) | 2-1 | 40 | Highly plagioclase-olivine-phyric sparsely vesicular basalt | Microcrystalline | Intersertal | Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay | Mixed plagioclase, diopside/augite, olivine | 1 | |
| 10R-1 (7) | 2-1 | 41 | Plagioclase-olivine-phyric basalt | Microcrystalline | Porphyritic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay Zeolite |
Mixed plagioclase, diopside/augite | 3–15? | |
| 10R-2 (1b) | 2-3 | 43 | Avesicular, plagioclase-olivine-phyric basalt | Fine grained | Porphyritic, intersertal groundmass | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay | Mixed plagioclase, diopside/augite, olivine | 2 | |
| 13R-1 (5) | 3-4 | 44 | Aphyric sparsely vesicular basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay FeOOH |
Mixed plagioclase, diopside/augite | Clay | 8.5 |
| 16R-1 (3) | 3-6 | 45 | Aphyric sparsely vesicular basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay FeOOH Carbonate |
Mixed plagioclase, diopside/augite, olivine | 6 | |
| 16R-1 (14) | 3-6 | 46 | Aphyric basalt with blotchy alteration | Crypto- to microcrystalline | Hyalophitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay | Mixed plagioclase, diopside/augite, olivine | 4 | |
| 16R-2 (6) | 3-6 | 47 | Sparsely vesicular aphyric basalt | Crypto- to microcrystalline | Aphanitic | Olivine Plagioclase |
Clay Carbonate Zeolite |
Mixed plagioclase, diopside/augite, olivine | 3 | |
| 16R-2 (7) | 3-6 | 48 | Aphyric sparsely vesicular basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay Zeolite |
23 | ||
| 19R-1 (6b) | 3-6 | 49 | Aphyric basalt with blotchy alteration | Cryptocrystalline | Hyalophitic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay Palagonite |
2 | ||
| 20R-1 (28) | 3-13 | 50 | Hyaloclastite | Olivine Plagioclase Glass |
FeOOH Zeolite Palagonite Calcedony |
50 | ||||
| 20R-1 (9) | 3-10 | 51 | Aphyric sparsely vesicular basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay FeOOH Pyrite Zeolite |
Mixed plagioclase, diopside/augite | 25 | |
| 23R-1 (10) | 3-20 | 52 | Aphyric sparsely vesicular basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay FeOOH |
Mixed plagioclase, diopside/augite, olivine | 16 | |
| 25R-1 (14) | 3-22 | 53 | Aphyric basalt with blotchy alteration | Microcrystalline | Aphanitic to hyalophytic | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay Zeolite |
Mixed plagioclase, diopside/augite, olivine | 12 | |
| 27R-1 (19) | 3-22 | Mixed plagioclase, diopside/augite, olivine | ||||||||
| 28R-1 (7) | 3-22 | 54 | Aphyric basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay | Mixed plagioclase, diopside/augite, olivine | 4 | |
| 29R-1 (14) | 3-24 | 55 | Aphyric sparsely vesicular basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay FeOOH Pyrite Carbonate |
Mixed plagioclase, diopside/augite, olivine | Phillipsite (Na) | 15 |
| 31R-2 (1) | 3-26 | 56 | Aphyric sparsely vesicular basalt | Microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay FeOOH Pyrite |
Mixed plagioclase, diopside/augite, olivine | 7 | |
| 31R-2 (6) | 3-26 | 57 | Aphyric sparsely vesicular basalt | Crypto- to microcrystalline | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide |
Clay FeOOH Carbonate Zeolite |
Mixed plagioclase, diopside/augite | Phillipsite (Na) | 22 |
| 32R-2 (9) | 3-26 | 58 | Aphyric basalt | Fine grained | Intersertal | Olivine Plagioclase Clinopyroxene Fe-Ti oxide Sulfide |
Clay | Mixed plagioclase, diopside/augite | 6 | |
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