Basalt
unit/subunit |
Core, section, piece,
interval (cm) |
Size
(µm) |
Titanomagnetite description
|
Other opaque minerals
|
Photomicrograph
|
|---|---|---|---|---|---|
| 197-1204A- | |||||
| 2 | 7R-3 (Piece 3, 36-37) |  200 |
~50% altered; maghemite rims on all crystals, but many have relict centers | Goethite is present; Fe oxyhydroxide is pervasive; no sulfide | 1204A-106 |
| 2 | 9R-1 (Piece 12B, 96-97) | 200 |
~50% altered; maghemite rims on all crystals, but many have relict centers | Goethite is pervasive; no sulfide | 1204A-113, 1204A-147 |
| 2 | 9R-2 (Piece 5, 50-51) | 500 |
Almost completely replaced by maghemite; rare, small (10 µm) relict Ti-Mag centers are present; maghemite is exsolving ulvöspinel |
Goethite is pervasive; no sulfide | 1204A-114, 1204A-115, 1204A-125 |
| 2 | 10R-2 (Piece 5, 77-79) | 250 |
Almost completely replaced by maghemite; rare, small (10 µm) relict Ti-Mag centers are present |
Goethite is pervasive; no sulfide | 1204A-155 |
| 2 | 10R-3 (Piece 2, 54-56) | 600 |
Unaltered | Secondary pyrite; no goethite or Fe oxyhydroxide | |
| 197-1204B- | |||||
| 1 | 2R-2 (Piece1B, 48-50) | 5-20 | Highly altered to maghemite; only larger crystals have relict Ti-Mag centers | Goethite is poorly developed; Fe oxyhydroxide is pervasive; no sulfide | 1204A-134 |
| 1 | 2R-4 (Piece 1, 16-19) | 150 |
Almost completely replaced by maghemite; rare, small (10 µm) relict Ti-Mag centers are present; maghemite is exsolving ulvöspinel |
Goethite is present; Fe oxyhydroxide is pervasive; no sulfide | |
| 1 | 2R-4 (Piece 2, 87-89) | 40 |
~50% altered; maghemite rims on all crystals, but many have relict centers | Goethite is pervasive; no sulfide | 1204A-148 |
| 2a | 4R-3 (Piece 5, 29-31) | 20 |
Contains maghemite rims; ilmenite oxidation lamellae are present | Goethite is poorly developed; Fe oxyhydroxide is pervasive; no sulfide | |
| 2a | 6R-4 (Piece 4, 21-24) | 120 |
~50% altered; maghemite rims and many crystals have relict centers | Goethite is poorly developed; Fe oxyhydroxide is pervasive; no sulfide | 1204A-149 |
| 2a | 7R-2 (Piece 16A, 129-131) | 100 |
~70% altered; maghemite is pervasive, but a few crystals have relict centers | Goethite is poorly developed; Fe oxyhydroxide is pervasive; no sulfide | 1204A-151 |
| 2a | 7R-3 (Piece 13, 106-108) | 600 |
Highly altered to maghemite; only larger crystals have relict Ti-Mag centers | Goethite is poorly developed; Fe oxyhydroxide is pervasive; no sulfide | 1204A-152 |
| 2b | 7R-3 (Piece 17, 140-142) | 300 |
Highly altered to maghemite, but many crystals have relict Ti-Mag centers | Goethite is pervasive; no sulfide. | 1204A-152 |
| 2b | 8R-3 (Piece 8, 53-55) | 800 |
Highly altered to maghemite; only larger crystals have relict Ti-Mag centers | Goethite is present; Fe oxyhydroxide is pervasive; no sulfide | 1204A-137, 1204A-141 |
| 2b | 9R-2 (Piece 1B, 22-24) | 1000 |
Unaltered | Secondary pyrite; no goethite or Fe oxyhydroxide | 1204A-153 |
| 2b | 10R-3 (Piece 2A, 25-27) | 700 |
Almost completely replaced by maghemite; rare, small (10 µm) relict Ti-Mag centers are present; maghemite is exsolving ulvöspinel |
Goethite is pervasive; no sulfide | 1204A-142, 1204A-143, 1204A-144 |
| 2b | 12R-1 (Piece 4A, 28-30) | 300 |
Almost completely replaced by maghemite; rare relict Ti-Mag areas parallel to cleavage planes are present | Section contains a vein of goethite; goethite is pervasive in the groundmass; no sulfide | 1204A-145, 1204A-146 |
| 2b | 13R-2 (Piece 1, 10-12) | 400 |
Highly altered to maghemite; only larger crystals have relict Ti-Mag centers | Goethite is pervasive; no sulfide | 1204A-154 |
| 2b | 13R-3 (Piece 1A, 32-34) | 250 |
Unaltered | Secondary pyrite; no goethite or Fe oxyhydroxide | |
| 2c | 14R-2 (Piece 5, 115-117) | 60 |
Almost completely replaced by maghemite; rare, small (10 µm) relict Ti-Mag centers are present; the majority of crystals are 10 µm |
Goethite is poorly developed; Fe oxyhydroxide is pervasive; no sulfide | |
| 2c | 14R-3 (Piece 14, 68-70) | 100 |
Completely altered to maghemite; the majority of crystals are 10 µm |
Goethite is present; Fe oxyhydroxide is pervasive; no sulfide. | |
| 2c | 15R-1 (Piece 9, 131-133) | 50 |
~50% altered; maghemite rims on all crystals, but many have relict centers | Goethite is poorly developed; Fe oxyhydroxide is pervasive; no sulfide | 1204A-162 |
| 3 | 17R-1 (Piece 13, 89-90) | 50 |
Highly altered to maghemite; only larger crystals have relict Ti-Mag centers; the majority of the crystals are 10 µm |
Goethite is poorly developed; Fe oxyhydroxide is pervasive; no sulfide |