Sample: 9AM43
| Sample ID: | 9AM43 [1] |
| Station ID: | 9AM43 |
| AT Num: | |
| Volcano: | Ugashik caldera |
| Possible source: | |
| Eruption: | |
| Collector: | Miller, T. P. |
| Date sampled: | 1979-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| Text Description: | Porphyritic hornblende dacite. Phenocrysts of normal and oscillatory-zoned plagioclase (26%), hornblende (4%), orthopyroxene (0.7%), clinopyroxene (0.5%), biotite (0.5%), and metallics (2.2%) in a fine-grained felsic groundmass (74%). Scarce olivine; less than 2% vesicles. |
| Sample Location: |
References Cited
[1] Geology of the Ugashik-Mount Peulik volcanic center, Alaska, 2004
Miller, T. P., 2004, Geology of the Ugashik-Mount Peulik volcanic center, Alaska: U.S. Geological Survey Open-File Report 2004-1009, 19 p., 2 sheets, scale 1:63,360.
full-text PDF 1.7 MB
plate 1 PDF 660 KB
plate 2 PDF 142 KB