Sample: 94SJP63

Sample ID:	94SJP63 ^[1]
Station ID:	94SJP63
AT Num:
Volcano:	Skookum Creek
Possible source:
Eruption:
Collector:	Preece, S. J.
Date sampled:	1994-00-00
Sample type 1:	Lava
Color:
Final unit:
Text Description:	Top flow from a vertical face on the summit of Gutbuster. Several flows can be seen on this face when flying past. Fine to medium grained, holocrystalline, porphyritic with a matrix (here up to 0.1 mm) of mesostasis, opaque, plagioclase (An45), microlites, orthopyroxene with clinopyroxene rims and clinopyroxene. Plagioclase phenocrysts (An55 - An64) are up to 6.75 mm and some have normal zoning, and there is occasional oscillatory zoning. Orthopyroxene phenocrysts are up to 2.63 mm. 62.6% matrix, 25.9% plagioclase, 0.1% clinopyroxene, 7.8% orthopyroxene, 3.6% vesicles.
Sample Location:

References Cited

[1] Geochemical variation in the less than 5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex, 1997

Preece, S. J., 1997, Geochemical variation in the less than 5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex: Miami University (Ohio) unpublished Ph.D. dissertation, 547 p.

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137 and G23AC00070.

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.