Sample: 73-ARh-86
| Sample ID: | 73-ARh-86 [1] |
| Station ID: | 73-ARh-86 |
| AT Num: | |
| Volcano: | |
| Possible source: | |
| Eruption: | |
| Collector: | Richter, D. H. |
| Date sampled: | 1973-00-00 |
| Sample type 1: | Tephra Fall |
| Color: | Dark gray |
| Final unit: | |
| Text Description: | Wrangell Lava. Basalt tuff cone (Holocene or Pleistocene). Grayish brown to yellowish-brown, bedded and locally palagonitic ash plus variable amounts of pumice, cinder and glassy bombs as much as 1 m in diameter. Thin beds of accretionary lapilli common locally. All ejecta are of olivine basalt composition. Dark-gray bombs contain phenocrysts of plagioclase (4-5 %, 0.5 mm) and fresh olivine (2-3%, 2-3 mm) in a glassy groundmass. Major element chemistry for sample 73-ARh-86 (map locality 1), a glassy bomb, is shown in table 1. Cone has been partly eroded by Copper River but has not been overridden by active glacial ice. Apparently erupted either through or ice during waning (stagnant) state of Wisconsin glaciation or through water or water-saturated sediments following Wisconsin glaciation. |
| Sample Location: |