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Sample: 74-AMm-84

Sample ID: 74-AMm-84 [1] [2]
Station ID: 74-AMm-84
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: Dacite Dikes. Generally associated with rhyolite and rhyodacite domes (Qrd, Qrdd) of first cycle of activity, but some (secs. 14 and 15, T. 3 N., R. 4 E.) may be younger and related to Snider Peak activity. All dikes sampled are medium to dark gray and sparsely porphyritic with small phenocrysts of plagioclase, hornblende, and locally rare biotite and hypersthene in a dense pilotaxitic to trachytic or dark cryptocrystalline 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.