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Sample: 74-AMm-85

Sample ID: 74-AMm-85 [1] [2]
Station ID: 74-AMm-85
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: Rhyodacite Dome. Dissected hornblende rhyodacite dome probably related in age to rhyolite domes (Qrd) of first-cycle volcanic activity. Rock is light to medium gray and porphyritic with phenocrysts (2-5 mm) of brown hornblende, plagioclase, and rare to common hypersthene, biotite, and augite in a felty to trachytic groundmass.
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.