Sample: 81-ASj-76

Sample ID:	81-ASj-76 ^[1]
Station ID:	81-ASj-76
AT Num:
Volcano:	Tanada Peak
Possible source:
Eruption:
Collector:	Unknown, Unknown
Date sampled:	1981-00-00
Sample type 1:	Lava
Color:
Final unit:
Text Description:	Wrangell Lava. Source and age mostly unknown. Olivine basalts. Thick (greater than 5 m), medium-gray to medium-dark-gray, sparsely porphyritic flows containing phenocrysts of fresh olivine (trace to 5%, 0.5-2 mm) in an intergranular to intersertal groundmass of plagioclase, olivine, clinopyroxene, and locally glass. * * * Source for northernmost flows is apparently a small eroded shield volcano 2-3 km north in Nabesna C-6 quadrangle.
Sample Location:

References Cited

[1] Geologic map of the Nabesna B-6 Quadrangle, south-central Alaska, 1993

Richter, D. H., Smith, J. G., Schmoll, H. R., and Smith, R. L., 1993, Geologic map of the Nabesna B-6 Quadrangle, south-central Alaska: U.S. Geological Survey Geological Quadrangle Map GQ 1688, unpaged, 1 sheet, scale 1:63,360.