Sample: 93SJP67


Sample ID: 93SJP67 [1]
Station ID: 93SJP67
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: Blocks of vitrophyre in scree from Dome F at Site 4. Fine grained, holocrystalline, porphyritic with a matrix of cryptocrystalline material, feldspar, quartz?, opaque and alteration. Plagioclase phenocrysts (An34 - An38) are up to 4.0 mm and most are rounded; there is often strong oscillatory zoning. Opaque phenocrysts are up to 0.4 mm. There is an altered phase that is now an opaque rim with a core of unidentifiable high relief crystals ± plagioclase. A second altered phase, larger in size, consists of serpentine/chlorite and calcite.
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5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex: Miami University (Ohio) unpublished Ph.D. dissertation, 547 p.