Reference 1392
Kellogg, K S; Harlan, S S; Mehnert, H H; Snee, L W; Pierce, K L; Hackett, W R; Rodgers, D W (1994) U. S. Geological Survey Bulletin, Report: B 2091, 18 pp., 1994
| Authors | Kellogg, K S; Harlan, S S; Mehnert, H H; Snee, L W; Pierce, K L; Hackett, W R; Rodgers, D W |
|---|---|
| Year | 1994 |
| Source | U. S. Geological Survey Bulletin, Report: B 2091, 18 pp., 1994 |
| ISSN | 8755-531X |
| GeoRef | 1995-007867 |
| Keywords | absolute age; alkali feldspar; Ar/Ar; Arbon Valley Tuff Member;ash-flow tuff; Bannock County Idaho; Bingham County Idaho; biotite;Butte County Idaho; Caribou County Idaho; Cassia County Idaho;Cenozoic; chemical composition; dates; feldspar group; frameworksilicates; Idaho; igneous rocks; lava; lithostratigraphy; majorelements; mica group; Miocene; Neogene; Power County Idaho;pyroclastics; rhyolite tuff; rhyolites; sanidine; sheet silicates;silicates; Snake River plain; southeastern Idaho; Starlight Formation;Tertiary; tuff; United States; USGS; volcanic rocks; volcanism |
Abstract
The Arbon Valley Tuff Member crops out over a distance of more than125 km along the southeastern margin of the eastern Snake River plain,as well as 90 km away on the northern margin of the plain. (super 40)Ar/ (super 39) Ar analyses from four different localities yield acomposite age of 10.20+ or -0.06 Ma. Petrographic and geochemicalstudies show that this tuff is distinct from younger ash-flow tuffs ofthe region. The Arbon Valley Tuff Member was erupted from an inferredcaldera in the area of Blackfoot, Idaho, as part of a volcanicprogression that subsequently migrated up the eastern Snake Riverplain to the Yellowstone Plateau.
4 samples from this reference
| Sample | Rock name | Major | Trace | Isotope |
|---|---|---|---|---|
| TSMA-1 | Tuff | |||
| TSMA-2 | Tuff | |||
| DR724D-3 | Tuff | |||
| FH86-2685B | Rhyolite | yes |