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Sample: 73-ARh-19

Sample ID: 73-ARh-19 [1] [2]
Station ID: 73-ARh-19
AT Num:
Volcano: Drum
Possible source:
Eruption:
Collector: Richter, D. H.
Date sampled: 1973-00-00
Sample type 1: Lava
Color:
Final unit:
Text Description: Thick lobate flows of dacite and minor rhyodacite that form massive piles along west, northwest, north, and northeast flanks of Mount Drum, apparently erupted from central vent. Rocks are light to pinkish medium gray, weather dark reddish brown, and are porphyritic with phenocrysts (1-3 mm) of plagioclase, hypersthene, hornblende, and rare to minor biotite and augite in a pilotaxitic to trachyitic groundmass. Probably related in age to late hornblende-biotite dacite domes (Qldd).
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.