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 the base of the subduction seismogenic zone,” in revision for Geochemistry, Geophysics, Geosystems.
  2. Hayles, J. A., L. Y. Yeung, M. Homann, B. Shen, A. Banerjee, H. Jiang, and C. T. A. Lee, “Three-billion-year secular evolution of the triple oxygen isotope composition of marine chert," in review at Earth and Planetary Science Letters. EarthArXiv preprint.
  3. Crockford, P. W., B. A. Wing, A. Paytan, M. S. W. Hodgskiss, K. K. Mayfield, J. A. Hayles, J. E. Middleton, A-S. C. Ahm, D. T. Johnston, F. Caxito, G. Uhlein, G. P. Halverson, B. Eickmann, M. Torres, and T. J.Hornerg, "Barium-isotopic constraints on the origin of post-Marinoan barites," Earth Planet. Sci. Lett. 519 (2019) 234-244. doi: 10.1016/j.epsl.2019.05.018
  4. Crockford, P. W., M. Kunzmann, A. Bekker, J. Hayles, H. Bao, G. P. Halverson,Y. Peng, T. H. Bui G. M. Cox, T. M. Gibson, S. Wörndle, R. Rainbird, A. Lepland, N. L. Swanson-Hysell, S. Master, B. Sreenivas, A. Kuznetsov, V. Krupenik, and B. A. Wing, "Claypool continued: Extending the isotopic record of sedimentary sulfate," Chem. Geol. 513 (2019) 200-225. doi: 10.1016/j.chemgeo.2019.02.030
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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