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Sample: 93SJP21

Sample ID: 93SJP21 [1]
Station ID: 93SJP21
AT Num:
Volcano: Skookum Creek
Possible source:
Eruption:
Collector: Preece, S. J.
Date sampled: 1993-00-00
Sample type 1: Lava
Color:
Final unit:
Text Description: Float boulder of silicic material at Site 1 in the Boyden Hills. Fine-grained, vesicular, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque, feldspar and microlites. Cognate inclusions of equigranular masses of plagioclase, opaque, orthopyroxene and biotite are present. There is no melt reaction between the inclusion and the host. Plagioclase phenocrysts (An43 - An53) are up to 2.2 mm and both oscillatory and normal zoning are common. Orthopyroxene phenocrysts are up to 2.75 mm, with intense pleochroism (birefringence at maximum for orthopyroxene) and large opaque inclusions. Dehydrated amphibole is present as opaque aggregates. Opaque phenocrysts up to 1.55 mm (does not appear to be aggregate). Biotite phenocrysts are up to 0.2 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5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex: Miami University (Ohio) unpublished Ph.D. dissertation, 547 p.