GRD029DS0
CIRCE 93-4
Basalt
Cenozoic › Paleogene › Eocene › Early Eocene
48.6
-
55.8
1
Ritter 154 › Cabinet 34 › Drawer B
Porphyritic
Small cut sample of vesicular porphyritic basalt; feldspar and pyroxene crystals are visible in the sample. White rind on sample. Billet and billet pieces. Original label: 21 August, 1968.
-
CIRCE
Indian Ocean
Original: 12 25.5, 65 55.0 E. Depth: -3540 to -3880 to -3730.
Latitude: 12.425°
Longitude: 65.916667°
-3716.0 m a.s.l.
N/A
Contact between two layers in the basalt. The upper half of the photomicrograph shows the feldspar-rich basalt with several larger plagioclase and olivine (near contact) phenocrysts. The lower portion of the photomicrograph shows the feldspar-poor basalt.
2.5
plane
Contact between two layers in the basalt. The upper half of the photomicrograph shows the feldspar-rich basalt with several larger plagioclase and olivine (near contact) phenocrysts. The lower portion of the photomicrograph shows the feldspar-poor basalt.
2.5
crossed
-
scan
crossed
GRD029DT0: Large subhedral plagioclase, clinopyoxene, olivine phenocrysts. Fine, acicular feldspar crystals in brown groundmass. The bassalt appears to be layered; the thin acicular feldspar crystals are more abundant at the top and the bottom of the thin section. (C. Eichler)
N/A
Fisher_GSABulletin_1971
Fisher, R.L., Sclater, J.G., McKenzie, D.P., 1971, Evolution of the Central Indian Ridge, Western Indian Ocean: Geological Society of America Bulletin, v. 82, no. 3, p. 553-562.