GRD028RS0
CIRCE 87-2A
Basalt
Cenozoic › Paleogene › Eocene › Early Eocene
48.6
-
55.8
1
Ritter 154 › Cabinet 34 › Drawer A
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Dark, fine-grained porphyritic basalt. Occasional euhedral to subhedral feldspar crystals. Fe-Mn crust on sample. Billet. Original label: 14 August, 1968.
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CIRCE
Indian Ocean
Original: 9 00.05, 67 17.0 E. Depth: -2050 to -1935.
Latitude: 9.00083°
Longitude: 67.283333°
-1975.0 m a.s.l.
N/A
Large subhedral plagioclase (lower left corner) and subhedral olivine with slight alteration to serpentine (greenish halo) in a fine-grained matrix of plagioclase, pyroxene, and opaques
2.5
plane
Large subhedral plagioclase (lower left corner) and subhedral olivine with slight alteration to serpentine (greenish halo) in a fine-grained matrix of plagioclase, pyroxene, and opaques
2.5
crossed
Porphyritic basalt
scan
crossed
GRD028RT0: Large subhedral plagioclase (albite and polysynthetic twinning) and olivine. Some plagioclase have resorption in the cores. Matrix is composed of fine-grained feldspar, pyroxenes, and opaques. Occasional glomerocrysts of olivine, anhedral plagioclase, and opaques. Some serpentine grown around olivine and along fractures. Minor amount of spinel (dark red/brown isotropic). Individual K-spar crystal with tartan twinning. (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.