Sample: 46AC158


Sample ID: 46AC158 [1]
Station ID: 46AC158
AT Num:
Volcano: Moffett
Possible source:
Eruption:
Collector: Unknown, Unknown
Date sampled: 1946-01-01
Sample type 1: Lava
Color: medium light-gray
Final unit:
Text Description: Medium light-fray (N6) olivine basalt flow. Vesicular, with seriate intersertal texture. Plagioclase crystals reach a maximum size of 1 mm and have a median composition of about An72. The outer rims and smaller crystals are oligoclase. The salite, which attains dimensions of 3 mm, and makes up about 6% of the rock has nZ 1.722 plus/minus 0.003, nY 1.698 plus/minus 0.003, and nX 1.688 plus/minus 0.003 suggesting a composition of Ca50Mg32Fe18. Olivine crystals attain a maximum size of 1 mm, are clove-brown, and have nX 1.694 and nZ 1.743, suggesting a composition of Fa30-34. Magnetite in rounded grains, as much as 1 mm across, is the principal accessory mineral. A few cumulophyric clots of magnetite, olivine, and clinopyroxene are present. A small amount of cloudy glass remains. Irregular vesicles are lined with tridymite.
Sample Location:

References Cited

[1] Magmatic differentiation in Tertiary and Quaternary volcanic rocks from Adak and Kanaga Islands, Aleutian Islands, Alaska, 1952

Coats, R. R., 1952, Magmatic differentiation in Tertiary and Quaternary volcanic rocks from Adak and Kanaga Islands, Aleutian Islands, Alaska: Geological Society of America Bulletin, v. 63, n. 5, p. 485-514.