Sample: Froese_2005_Gold_Run_tephra
| Sample ID: |
Froese_2005_Gold_Run_tephra [1] |
| Station ID: |
Froese_2005_Gold_Run_tephra |
| AT Num: |
|
| Volcano: |
|
| Possible source: |
|
| Eruption: |
|
| Collector: |
Unknown, Unknown |
| Date sampled: |
|
| Sample type 1: |
Tephra Fall |
| Color: |
white |
| Final unit: |
|
| Text Description: |
White, rhyolitic tephra, about 10 cm thick at its type locality in the Klondike goldfields (UT1777, UT1907), and is typically disrupted into pods by loading and solifluction processes. The host sediment at its type locality and at Thistle Creek (UT1806) is retransported loess, but at the Sixty-mile site (UT1791 ), Gold Run tephra occurs near the top of a sandy colluvial diamict. The glass is in the form of highly inflated pumice grains, pumice of low vesicularity with thick vesicle walls, "stretch" pumice with cylindrically-shaped vesicles, abundant blocky fragments of transparent glass, and some bubble-walled shards. A green to brown hornblende, commonly with numerous acicular fluid inclusions aligned parallel to the elongation of the grain, is abundant, as is plagioclase, and the FeTi oxides. Hypersthene is present, but less abundant than hornblende. |
| Sample Location: |
|
References Cited
Froese, D.G, Westgate, J.A., and Alloway, B.V., (eds.), 2005, Field trip guide for the International Field Conference and Workshop on Tephrochronology and Volcanism: Institute of Geological and Nuclear Sciences Science Report 2005/26, Dawson City, Yukon Territory, Canada, July 31-August 8, 2005, 132 p.