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Sample: 87-ASW-48

Sample ID: 87-ASW-48 [1]
Station ID: 87-ASW-48
AT Num:
Volcano: Wrangell
Possible source:
Eruption:
Collector: Unknown, Unknown
Date sampled: 1987-00-00
Sample type 1: Lava
Color:
Final unit:
Text Description: Mount Wrangell younger andesitic flows and dikes (Pleistocene). Flows are dark-gray, sparsely porphyritic to microporphyritic andesite that contains phenocrysts and microphenocrysts of plagioclase (5-8%, 0.1-0.5 mm), augite (1-3%, 0.1-0.3 mm), and hypersthene (trace, 0.2 mm). Dikes are mineralogically similar to flows but also contain trace to 2% fresh olivine. * * * Source of flows may be fissure that extends west from unnamed 11,610-ft (3,539-m) peak (sec. 21, T. 3 N., R. 7 E.) on west flank of Mount Wrangell. Unit may be as much as 300 m thick.
Sample Location:

References Cited

[1] Geologic map of the Gulkana A-1 Quadrangle, south-central Alaska, 1994

Richter, D. H., Duffield, W. A., Sawyer, D. A., Schmoll, H. R., and Ratte, J. C., 1994, Geologic map of the Gulkana A-1 Quadrangle, south-central Alaska: U.S. Geological Survey Geological Quadrangle Map GQ 1728, unpaged, 1 sheet, scale 1:63,360.