Actions for History of the youngest members of the Valles Rhyolite, Valles caldera, New Mexico using ESR dating method [electronic resource].

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History of the youngest members of the Valles Rhyolite, Valles caldera, New Mexico using ESR dating method [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (6 pages) : digital, PDF file
Additional Creators
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The cooling history of the Valles caldera was studied by the electron spin resonance (ESR) dating method using Al and Ti centers in quartz grains which were separated from the youngest units of the Valles Rhyolite. The ESR apparent ages are much younger than fission track ages and ³⁹Ar- ⁴°Ar ages. Three possibilities are suggested, the first is that the ESR ages are real, the second is that ESR method did not work for these samples, and the third is that about 10--40 ka, the signal intensity was partially reduced by a thermal event such as proposed by Harrison et al. (1986). Research on the first and second possibilities is continuing. The third possibility might explain the difference between ESR ages and those by other methods (fission track and ³⁹Ar- ⁴°Ar). ESR dating has produced new insights regarding the history of the Valles caldera.
Report Numbers
E 1.99:la-ur-92-245
E 1.99: conf-911052--1
conf-911052--1
la-ur-92-245
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1991.
"la-ur-92-245"
" conf-911052--1"
"DE92007430"
3. international symposium on electron spin resonance spectroscopy, Gaithersburg, MD (United States), 14-18 Oct 1991.
Goff, F.; Toyoda, S.; Ogoh, K.; Ikeda, S.; Ikeya, M. . Dept. of Physics.
Funding Information
W-7405-ENG-36
View MARC record | catkey: 14381308