At Valles Caldera - Sulphur Springs Geothermal Area (Toyoda, Et Al., 1995)

From Open Energy Information

Exploration Activity: At Valles Caldera - Sulphur Springs Geothermal Area (Toyoda, Et Al., 1995)

Exploration Activity Details
Location Valles Caldera - Sulphur Springs Geothermal Area
Exploration Technique {{{Technique}}}
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Activity Date - 1995
Usefulness useful regional reconnaissance
DOE-funding Unknown

Exploration Basis
The study seeks to refine the age dates of the El Cajete and Battleship Rock members of the Valles Rhyolite using a dating method that elimates the effects of hydrothermal alteration and thermal annealing, both of which were sources of scatter in previous geochronology studies.
Samples of the Battleship Rock and El Cajete Members of the Valles Rhyolite and the South Mountain Rhyolite were collected for Electron Spin Resonance (ESR) dating. Samples were collected at locations both inside and outside the caldera to eliminate bias caused by post-caldera hydrothermal alteration. ESR signals from Al and Ti centers were measured using a JEOL RE-1X X-band ESR spectrometer. The ESR signal of the stable component of Ti centers yielded an age of 59 +/- 6 ka for the Battleship Rock Member and 53 +/- 6 ka for the El Cajete Member. Both of these ages are younger than the ages determined via other dating methods, and suggest that the age of recent volcanism in the Jemez Mountains is much younger than previously thought.

Additional References