Sample: 93SJP57

Sample ID:	93SJP57 ^[1]
Station ID:	93SJP57
AT Num:
Volcano:	Skookum Creek
Possible source:
Eruption:
Collector:	Preece, S. J.
Date sampled:	1993-00-00
Sample type 1:	Tephra Fall
Color:
Final unit:
Text Description:	Scoria from the spatter ridge at Site 4. Fine-grained, vesicular, hypocrystalline, intersertal, porphyritic with a matrix of brown glass, plagioclase, opaque and alteration in vesicles. Plagioclase phenocrysts (An44 - An53) have two populations: most are 0.25-0.05 mm and a few are zoned; less common are grains 0.6-0.4 mm with sieve textured zones. Olivine phenocrysts are up to 0.9 mm and a few have skeletal habits, and some have opaque inclusions and/or overgrowth rims. Clinopyroxene phenocrysts are up to 0.35 mm.
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5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex: Miami University (Ohio) unpublished Ph.D. dissertation, 547 p.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.