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Sample: 85ARh-17

Sample ID: 85ARh-17 [1]
Station ID: 85ARh-17
AT Num:
Volcano:
Possible source:
Eruption:
Collector: Richter, D. H.
Date sampled: 1985-00-00
Sample type 1: Tephra Fall
Color:
Final unit:
Text Description: Wrangell Lava. Dacite agglutinate (Tertiary) - Extensive but relatively thin (25-35 m) dacite (64.8% - 65.5% SiO2; map nos. 20-22) agglutinate consisting of densely welded flattened pumice, stretched glass fragments (fiamme), and equidimensional lithic fragments exhibiting a well developed eutaxitic texture. Rock is sparsely porphyritic containing phenocrysts of plagioclase (1-5%), minor clinopyroxene, and occasional rounded quartz and olivine. Agglutinate appears to be single flow interlayered in unit Tsl.
Sample Location:

References Cited

[1] Geologic map of the McCarthy D-1 Quadrangle, Alaska, 2000

Richter, D. H., Ratte, J. C., Leeman, W. P., and Menzies, Martin, 2000, Geologic map of the McCarthy D-1 Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 2695, unpaged, 1 sheet, scale 1:63,360.