Sample: UT250
| Sample ID: | UT250 [1] |
| Station ID: | UT250 |
| AT Num: | |
| Volcano: | |
| Possible source: | Drum |
| Eruption: | Drum Sheep Creek Tephra-CC |
| Collector: | Unknown, Unknown |
| Date sampled: | |
| Sample type 1: | Tephra Fall |
| Color: | |
| Final unit: | |
| Text Description: | Unit 5 at this location contains angular fragments of tephra believed to have been "eroded, transported, and redeposited in a frozen state’" (Weber et al., 1981). This tephra is SCt, here named SCt-CC. In their 1981 paper, Weber et al. stated that this tephra was identified by Westgate as the Dome Ash Bed, but further work showed this identification to be incorrect. The tephra pods show plastic deformation in places, and elsewhere are preserved as thin beds up to 10 cm long that are parallel to bedding. See Westgate et al. (2007) for a discussion of the context of this tephra. A strongly pleochroic hypersthene with fluid and opaque inclusions is abundant as are hornblende and plagioclase. Ilmenite and magnetite are conspicuous and trace amounts of basaltic hornblende, augite, and quartz are present. Many of the minerals do not have attached glass and are slightly rounded, but otherwise look the same as those with attached glass. A white frothy pumice is the dominant phase, and occurs together with a small amount of brown glass that is not observed in SCt in the Fairbanks area. |
| Sample Location: |