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New Evidence for the Age of the Youngest Eruptions in the Valles Caldera, New Mexico
Abstract New geochronologic data provide evidence f
New geochronologic data provide evidence for an age of about 50 to 60 ka for the youngest volcanic eruptions within the Valles caldera, New Mexico�an age that is significantly younger than most previous age determinations. Thermoluminescence age estimates for buried soils beneath the El Cajete pumice, a key stratigraphic marker in the region, range from 48 to 61 ka, and 14C analyses of burnt logs within volcanic surge beds near the El Cajete vent yield similar ages of 50 to >58 ka. These data conflict with fission-track, 40Ar/39Ar, and K-Ar ages of 130 to >200 ka, but are supported by recent analyses by electron spin resonance. The results of this study reinforce the need to apply a variety of dating methods when evaluating the age of young volcanic events and support the hypothesis that the El Cajete eruptions were part of a new cycle of volcanic activity in the Valles caldera after an exceptionally long period of quiescence of _460 ka. The new age constraints also suggest a previously unrecognized link between cycles of volcanism and pulses of hydrothermal activity in the caldera, such that hydrothermal outflow appears to decrease significantly following completion of eruptive cycles.
y following completion of eruptive cycles.  +
Author Steven L. Reneau  + , Jamie N. Gardner  + , Steven L. Forman  +
Citation Steven L. Reneau,Jamie N. Gardner,Steven L. Forman. 1996. [[New Evidence for the Age of the Youngest Eruptions in the Valles Caldera, New Mexico]]. Geology. 24(1):7-10.  +
DOI 10.1130/0091-7613(1996)_024<0007:NEFTAO>_2.3.CO;2  +
Document type Journal Article  +
Foaf/Page http://geology.gsapubs.org/content/24/1/7.abstract  +
Link http://geology.gsapubs.org/content/24/1/7.abstract  +
Name New Evidence for the Age of the Youngest Eruptions in the Valles Caldera, New Mexico  +
PublicationDate 1996  +
Publisher Geology  +
ReferenceGenre Geothermal  +
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New Evidence for the Age of the Youngest Eruptions in the Valles Caldera, New Mexico + , New Evidence for the Age of the Youngest Eruptions in the Valles Caldera, New Mexico +
Categories References , Geothermal References
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Fenton Hill HDR Geothermal Area + , Valles Caldera - Redondo Geothermal Area + , Valles Caldera - Sulphur Springs Geothermal Area + ReferenceForReneauGardnerForman1996