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Sample: 74-AMm-75

Sample ID: 74-AMm-75 [1] [2]
Station ID: 74-AMm-75
AT Num:
Volcano: Drum
Possible source:
Eruption:
Collector: Miller, T. P.
Date sampled: 1974-00-00
Sample type 1: Lava
Color:
Final unit:
Text Description: Two-pyroxene andesite and minor two-pyroxene dacite flows erupted from central vent and possibly from local satellitic vents especially along east, southeast, and south flanks of Mount Drum. Flows are 1 to about 20 m thick, have oxidized scoriaceous tops and bottoms, and are locally highly vesicular. Rocks are dark gray to medium brownish gray and are not conspicuously porphyritic. They contain small (1 mm) phenocrysts of plagioclase, hypersthene, augite, olivine, and locally hornblended in variable amounts in an intergranular to intersertal groundmass of feldspar, mafic minerals, and locally minor glass.
Sample Location:

References Cited

[1] Eruptive history and petrology of Mount Drum volcano, Wrangell Mountains, Alaska, 1994

Richter, D.H., Moll-Stalcup, E.J., Miller, T.P., Lanphere, M.A., Dalrymple, G.B., and Smith, R.L., 1994, Eruptive history and petrology of Mount Drum volcano, Wrangell Mountains, Alaska: Bulletin of Volcanology, v. 56, n. 1, p. 29-46.

[2] Geologic map of the Gulkana A-2 quadrangle, Alaska, 1979

Richter, D. H., Smith, R. L., Yehle, L. A., and Miller, T. P., 1979, Geologic map of the Gulkana A-2 quadrangle, Alaska: U.S. Geological Survey Geological Quadrangle Map GQ 1520, unpaged, 1 plate, scale 1:63,360.