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Sample: 74-AMm-93

Sample ID: 74-AMm-93 [1] [2]
Station ID: 74-AMm-93
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: Olivine-bearing two-pyroxene dacite and minor two-pyroxene andesite flows restricted to south flank of Mount Drum where they locally overlie two-pyroxene dacite flows (Qzaf) and are probably overlain by dacite flows of Snider Peak (Qsdf). Source unknown; possibly in vicinity of Snider Peak dome. Flows are thick (>20 m) and massive with locally pronounced columnar jointing. Rocks are medium to dark gray and contain small phenocrysts (1 mm) of plagioclase, hypersthene, olivine, augite, and locally minor hornblende in a fine-grained intergranular to felty 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.