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Sample: 46AC36

Sample ID: 46AC36 [1] [2]
Station ID: 46AC36
AT Num:
Volcano: Adagdak
Possible source:
Eruption:
Collector: Unknown, Unknown
Date sampled: 1946-01-01
Sample type 1: Lava
Color: light brownish-gray
Final unit:
Text Description: A dense porphyritic, olive basalt, light brownish-gray (5YR 6/1). About 85 per cent phenocrysts, chiefly plagioclase, salite, and olivine. Plagioclase clear, ranging in size from 2 to 0.2 mm, in composition from An98 to An54, with a median of about An67. Extreme outer zones reach An10. Salite crystals are greenish-black (5G 3/1) in hand specimen, reaching a size of 4mm. NX is 1.701 and nZ 1.728, corresponding to salite with atomic proportions of Fe25Ca50Mg25. Olivine, which is sparse, reaches a size of about 1mm, in honey-yellow (10YR 6/4) crystals, with nY about 1.714, corresponding to Fa30.
Sample Location:

References Cited

[1] A petrologic re-investigation of the Adak volcanic center, central Aleutian arc, Alaska, 1994

Myers, J. D., and Frost, C. D., 1994, A petrologic re-investigation of the Adak volcanic center, central Aleutian arc, Alaska: Journal of Volcanology and Geothermal Research, v. 60, n. 2, p. 109-146.

[2] 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.