I am an isotope geochemist studying the fundamental controls on isotopic distributions in rocks. 

I am an expert in using multiple isotopes simultaneously to determine mechanisms of geochemical cycling, from both a theoretical and experimental perspective. My Ph.D. work focused on the triple-isotope systems, such as in oxygen, and how they are used to determine temperatures and mechanisms of geochemical reactions.

In the Yeung Lab, I using a laser fluorination system to extract oxygen from a variety of oxide minerals, which can tell us about the environments in which they formed.


Email: Justin.A.Hayles@rice.edu




Academic background

  • NSF Postdoctoral Fellow, Rice University, 2018 -

  • Postdoctoral Research Associate, Rice University 2016 - 2018

  • Ph.D., Geochemistry, Louisiana State University 2016

  • M.S., Geology, Louisiana State University 2013

  • B.S., Geology, University of South Alabama 2010


  1. Condit, C. B., M. E. French, J. A. Hayles, L. Y. Yeung, and C. T. A. Lee, “Fluid sources and stress state at deep slow slip conditions in subduction zones,” submitted.
  2. Hayles, J. A., M. Homann, B. Shen, A. Banerjee, H. Jiang, C. T. A. Lee, and L. Y. Yeung, “Triple-isotope evidence for three-billion-year secular evolution of oxygen isotopes in seawater," in review at Science.
  3. Yeung, L. Y., J. A. Hayles, H. Hu, J. L. Ash, and T. Sun, “Scale distortion from pressure baselines as a source of inaccuracy in triple-isotope measurements,” Rapid Commun. Mass Spectrom. 32 (2018) 1811-1821. doi: 10.1002/rcm.8247
  4. Crockford, P. W., J. A. Hayles, H. Bao, N. J. Planavsky, A. Bekker, P. W. Fralick, G. P. Halverson, T. H. Bui, Y. Peng,and B. A. Wing, "Triple oxygen isotope evidence for limited mid-Proterozoic primary productivity," Nature 559 (2018) 613-616. doi: 10.1038/s41586-018-0349-y
  5. Hayles, J. A., C. Gao, X. Cao, Y. Liu, and H. Bao, "Theoretical calibration of the triple oxygen isotope thermometer," Geochim. Cosmochim. Acta 235 (2018) 237-245. doi: 10.1016/j.gca.2018.05.032
  6. Blättler, C. L., M. W. Claire, A. R. Prave, K. Kirsimäe, J. A. Higgins, P. V. Medvedev, A. E. Romashkin, D. V. Rychanchik, A. L. Zerkle, K. Paiste, T. Kreitsmann, I. L. Millar, J. A. Hayles, H. Bao, A. V. Turchyn, M. R. Warke, and A. Lepland, "Two-billion-year-old evaporites capture Earth’s great oxidation," Science 360 (2018) 320-323. doi: 10.1126/science.aar2687
  7. Hayles, J. A., X. Cao, and H. Bao, "The statistical mechanical basis of the triple isotope fractionation relationship," Geochem. Persp. Let. 3 (2017), 1-11. doi: 10.7185/geochemlet.1701
  8. Crockford, P. W., B. R. Cowie, D. T. Johnston, P. F. Hoffman, I. Sugiyama, A. Pellerin, T. H. Bui, J. Hayles, G. P. Halverson, F. A. Macdonald, and B. A. Wing, "Triple oxygen and multiple sulfur isotope constraints on the evolution of the post-Marinoan sulfur cycle," Earth Planet. Sci. Lett. 435 (2016), 74-83. doi: 10.1016/j.epsl.2015.12.017
  9. Bao, H., X. Cao, and J. A. Hayles, "Triple Oxygen Isotopes: Fundamental Relationships and Applications," Annu. Rev. Earth Planet. Sci. 44 (2016), 463-492. doi: 10.1146/annurev-earth-060115-012340
  10. Bao, H., X. Cao, and J. A. Hayles, "The confines of triple oxygen isotope exponents in elemental and complex mass-dependent processes," Geochim. Cosmochim. Acta 170 (2015), 39-50. doi: 10.1016/j.gca.2015.07.038
  11. Hayles, J. A. and H.Bao, "The Reduction and Oxidation of Ceria: A Natural Abundance Triple Oxygen Isotope Perspective," Geochim. Cosmochim. Acta 159 (2014), 220-230. doi: 10.1016/j.gca.2015.03.030
  12. Killingsworth, B. A., J. A. Hayles, C. Zhou, and H. Bao, "Sedimentary constraints on the duration of the Marinoan Oxygen-17 Depletion (MOSD) event," Proc. Natl. Acad. Sci. USA 110 (2013), 17,686–17,690. doi: 10.1073/pnas.1213154110