Research — Geochronology
NMGRL is involved with a variety of research projects addressing volcanic hazards, climate change, plutonism, and uplift and tectonism (among many others). We are also deeply involved with development of technology for 40Ar/39Ar geochronology and noble gas mass spectrometers.
Tephra layers in Rio Grande Rift Sediments
The Jemez Mountains volcanic field, in northwestern New Mexico, has been active for at least the past 16.5 million years, and has produced a large number of explosive and effusive volcanic eruptions during that time. Volcanic ash from the Jemez Mountains volcanic field provides a temporal record of the young eruptions from the caldera and many such deposits have been recognized in a number locations in New Mexico. The ash is present as thick deposits near the eruptive source, and as thinner deposits interbedded in ancestral Rio Grande river sediments at greater distances from the vent.