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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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