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Sample: 72-PCL-41

Sample ID: 72-PCL-41 [1]
Station ID: 72-PCL-41
AT Num:
Volcano:
Possible source:
Eruption:
Collector: Lowe, P. C.
Date sampled: 1972-00-00
Sample type 1: Lava
Color:
Final unit:
Text Description: Wrangell Lava. Rhyodacite dikes. Medium grained, locally porphyritic rocks with phenocrysts of hornblende, hypersthene, and plagioclase. Dikes range from 1 to 20 m in width and often occur in subparallel sets. Apparently associated with rhyodacite domes (unit QTr). Locally fissile, parallel to dip; or, show columnar jointing, perpendicular to dip. Host andesites (QTau) locally contain sulfide minerals, chiefly pyrite, near contact
Sample Location:
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Legend
✕
Red (Warning)
Orange (Watch)
Yellow (Advisory)
Green (Normal)
Uninstrumented

200 km
100 mi
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References Cited

[1] Geologic map of the Nabesna B-5 Quadrangle, Alaska, 1982

Lowe, P.C., Richter, D.H., Smith, R.L., and Schmoll, H.R., 1982, Geologic map of the Nabesna B-5 Quadrangle, Alaska: US Geological Survey Geologic Quadrangle Maps 1566, 1 sheet, scale 1:63,360, available at http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=13055 .