Reference 895
Kellogg, Karl S; Marvin, Richard F (1988) U. S. Geological Survey Bulletin, Report: B 1806, 19 pp., 1988
| Authors | Kellogg, Karl S; Marvin, Richard F |
|---|---|
| Year | 1988 |
| Source | U. S. Geological Survey Bulletin, Report: B 1806, 19 pp., 1988 |
| ISSN | 8755-531X |
| GeoRef | 1988-028816 |
| Keywords | absolute age; age; ash flows; basalts; Bingham County Idaho; Blackfootregion; Buckskin Dome; calderas; Cenozoic; dates; domes; evolution;Fort Hall Indian Reservation; geochemistry; geochronology; Idaho;igneous rocks; K/Ar; lava; major elements; Neogene; neotectonics;rhyolites; Snake River plain; southeastern Idaho; Starlight Formation;structural geology; tectonics; Tertiary; United States; upperCenozoic; USGS; volcanic features; volcanic rocks; volcanism;volcanology |
Abstract
Eight new potassium-argon ages are presented from rhyolitic andbasaltic rocks from the Fort Hall Indian Reservation, near Blackfoot,Idaho. These ages, combined with those previously published, documentthe following conclusions; 1 The oldest known rhyolitic activity inthe study area is about 9-10 Ma; 2 major Basin and Range upliftoccurred about 7 Ma; 3 the character of volcanic activity changeddramatically about 4 Ma from caldera-fed, rhyolitic ash-flow eruptionsto fissure flows of tholeiitic basalt; and 4 an unusual dome-shapedstructure, called the Buckskin Dome, is underlain entirely by basaltand has formed since about 2.3 Ma.
18 samples from this reference
| Sample | Rock name | Major | Trace | Isotope |
|---|---|---|---|---|
| BB704A | Basalt | yes | ||
| BB699A | Basalt | yes | ||
| BB608A | Basalt | yes | ||
| BF748A | Vitrophere | |||
| BF752A | Vitrophere | yes | ||
| BB712A | Tuff | yes | ||
| BF694A | Basalt | yes | ||
| BB731A | Vitrophere | yes | ||
| BF750B | Tuff | yes | ||
| BF641B | Tuff | yes | ||
| BK753B | Tuff | yes | ||
| BF691B | Rhyolite | yes | ||
| BF624B | Rhyolite | yes | ||
| BB718B | Rhyolite | yes | ||
| BB671B | Tuff | yes | ||
| BB667B | Tuff | yes | ||
| BB670B | Tuff | yes | ||
| BF707B | Tuff | yes |