Sample: 81ARj 11a
| Sample ID: | 81ARj 11a [1] |
| Station ID: | 81ARj 11a |
| AT Num: | |
| Volcano: | Ugashik caldera |
| Possible source: | |
| Eruption: | |
| Collector: | Riehle, J. R. |
| Date sampled: | 1981-01-01 |
| Sample type 1: | Lahar |
| Color: | |
| Final unit: | |
| Text Description: | Porphyritic plagioclase-orthopyroxene dacite (s; high-silica andesite G). Glassy groundmass contains randomly oriented phenocrysts of orthopyroxene and larger phenocrysts of plagioclase (AN 64-68). Some parts of the thin section have glomeroporphyritic pyroxene and plagioclase; bulk of the phenocrysts are individual crystals. Plagioclase is weakly zoned. |
| Sample Location: |