Sample: 94SJP70A

Sample ID:	94SJP70A ^[1]
Station ID:	94SJP70A
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:	Approximately 2-4' thick massive zone in an otherwise rubbly and blocky unit from the base of the capping wall-like andesite package at Site 7. Fine grained, holocrystalline, seriate porphyritic with a matrix of mesostasis, alteration, opaque and clinopyroxene. Plagioclase phenocrysts (An30-An58) are up to 1.25 mm and commonly have sieve textured zones, display minor alteration to mica and normal zoning. Olivine phenocrysts are up to 2.0 mm and are mostly altered with only olivine cores preserved. Orthopyroxene phenocrysts are up to 0.55 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5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex: Miami University (Ohio) unpublished Ph.D. dissertation, 547 p.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.