Isothermal plateau fission‐track age and revised distribution of the widespread mid‐Pleistocene rockland tephra in west‐central United States
Authors:
- 20 March 1992
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 19 (6) , 569-572
Abstract
A tephra bed in southeastern Idaho is correlated to Rockland tephra, a widespread silicic air‐fall unit previously identified in northern California and western Nevada. Correlation of proximal Rockland tephra and its distal correlative is based on glass chemistry determined by electron microprobe and neutron activation analysis. An age estimate of proximal Rockland tephra is precisely determined by application of the isothermal plateau fission‐track (ITPFT) technique to its hydrated glass shards. A weighted mean age of 0.47 ± 0.04 Ma compares well with age estimates based on co‐existing mineral phases using the external detector fission‐track and additive‐dose thermoluminescence techniques. The presence of Rockland tephra 800 km east of its presumed eruptive source will improve the development of detailed chronologies and correlation of Pleistocene sedimentary sequences located in coalescent intermontane basins of west‐central United States.Keywords
This publication has 10 references indexed in Scilit:
- The use of glass for dating volcanic ash by thermoluminescenceJournal of Geophysical Research, 1991
- Fission-Track Age (400,000 yr) of the Rockland Tephra, Based on Inclusion of Zirco Grains Lacking Fossil Fission TracksQuaternary Research, 1991
- Isothermal plateau fission-track ages of hydrated glass shards from silicic tephra bedsEarth and Planetary Science Letters, 1989
- Correlation of upper Cenozoic tephra layers between sediments of the western United States and eastern Pacific Ocean and comparison with biostratigraphic and magnetostratigraphic age dataGeological Society of America Bulletin, 1987
- Thermoluminescence dating of volcanic ashJournal of Volcanology and Geothermal Research, 1985
- Correlation of the Rockland Ash Bed, a 400,000-Year-Old Stratigraphic Marker in Northern California and Western Nevada, and Implications for Middle Pleistocene Paleogeography of Central CaliforniaQuaternary Research, 1985
- Trace Element Analysis by Neutron Activation With a Low Flux Reactor (Slowpoke ‐ II): Results for International Reference RocksGeostandards Newsletter, 1984
- Zircon fission-track age of 0.45 million years on ash in the type section of the Merced Formation, west-central California1980
- Geochemical application of spark source mass spectrography—III. Element sensitivity, precision and accuracyGeochimica et Cosmochimica Acta, 1977
- Fossil tracks of charged particles in mica and the age of mineralsJournal of Geophysical Research, 1963