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Center for Stable Isotopes

Center for Stable Isotopes

The University of New Mexico Center for Stable Isotopes is a non-profit research focused laboratory and analytical facility founded in 2014. The mission of UNM-CSI is to support world-class stable isotope research by scientists and students across disciplines from Earth and Planetary Sciences, Biology, Anthropology, Chemistry and the Biomedical Sciences. We aim to do this by:

  1. Providing broad access to state-of-the-art analytical instrumentation capable of measuring stable isotope ratios of light elements-–carbon, nitrogen, oxygen, hydrogen, sulfur and chlorine-–in organic and inorganic substrates at affordable rates.
  2. Providing educational support in the form of training programs with hands-on instruction for undergraduate and graduate students on how to collect, prepare, and analyze sample, as well as aid in the interpretation of results.
  3. Encourage cross-disciplinary exchange of ideas and techniques at UNM and beyond regarding the application of stable isotopes in the planetary, life and medical sciences.


Hot Off the Mass Spectrometer

Characteristic δʹ18O – Δʹ17O fields for different materials. See Sharp et al., Geochem. Persp. Lett. 2018 for publication

δ13C and δ15N values of coyotes (circles) and their potential prey (diamonds) from Cape Breton Highland National Park, Nova Scotia. Coyotes involved in attacks on humans are represented by white circles while individuals known to consume anthropogenic resources are represented by black circles. Isotope values for local humans (black diamond) are also shown for comparison.

δ13C and δ15N values of silky pocket mouse (Perognathus flavus) blood plasma captured in 2014 from the Sevilleta National Wildlife Refuge, NM; sample sizes are in parentheses. Standard ellipse areas (SEAs) increase by ~50% during the onset of the summer monsoon from July through October and shift towards greater use of C4 resources.

Hydrogen isotope (δ2H) values of tilapia (Oreochromis niloticus) muscle (A) and liver (B) tissue versus environmental (tank) water δ2H values. The slopes of the regressions for various diet treatments (black, gray, white circles) estimate the proportion of hydrogen in each tissue derived from environmental water.  

Highlighted Student Abstract

Author/s: Erick J. Cano and Zachary D. Sharp

Oxygen isotope ratios (16O/18O) have been used in numerous studies of mantle lithologies to estimate 1) the protolith 2) the source of metasomatizing fluids, 3) temperature of formation, and 4) degree of equilibration between coexisting minerals. The δ18O value of mantle olivine comprises a very restricted range (Mattey et. al., 1994), so that even subtle deviations from this ‘canonical’ value indicate some form of contamination. Eclogites span a range of 2–8... read more

Highlighted Faculty Research

Gut microbiota are now recognized as important contributors to the diet and overall fitness of most animals for many reasons. These microbial communities often metabolize compounds that their host species cannot, and they contribute essential compounds needed for homeostasis and reproduction, particularly for organisms that experience seasonal or pesistent protein limitation. To date, most studies have focused on how gut microbes influence carbohydrate metabolism of their host, especially... read more