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 |