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Jeffrey Martin Heikoop

Jeff Heikoop

Phone (505) 667-8128


  • Earth and Space Sciences
  • Geoscience
  • Hydrology
  • Geology
  • Geochemistry
  • Biogeochemistry


My research expertise includes 1) the use of nitrogen, carbon, oxygen, deuterium, sulfur, chromium and uranium isotopes as geochemical tracers of pollution and in interrogating biogeochemical cycles; 2) contaminant dynamics in complex surface and subsurface environments; 3) reconstructing paleoclimate records from the lake sediments, bogs, corals and tree rings utilizing light stable isotopes, trace elements and other proxies.  Recent special interests include a) paleoclimate records in lacustrine sediments, b) applying geochemical techniques to tracing contaminants such as nitrate, chromate, uranium and perchlorate, and c) the use of isotopes in optimizing algal biofuels production, d) isotopic measurements of global change, particularly in Arctic environments and e) environmentally sound in-situ recovery mining of uranium.


Ph.D. Geology - McMaster University, Hamilton, Ontario, Canada, Jan. 1997.


LANL Positions

June 2018 to Present - Deputy Group Leader, EES-14

April 2018 - Present - Team Leader Field Instrument Deployments and Operations Team

June 2017- June 2018 - Acting Deputy Group Leader, EES-14

Oct. 2010 – May 2017 Team Leader Geology, Geochemistry and Geomaterials Research Team

August, 2006 – Sept 2009. LANL Technical Staff Member; Project Leader for Site Scale Modeling and Characterization in LANL Water Stewardship Program.

May 2001 – August, 2006. LANL Technical Staff Member.

Sept. 1998 – May 2001. Postdoctoral Fellow, Geology and Geochemistry Group, Earth and Environmental Sciences Division, Los Alamos National Laboratory.  Projects: Stable Isotope and Trace Element Environmental Signals in Calcareous Organisms. Isotopic Signatures of Wastewater Uptake in Wetland Plants.


Professional Societies

American Geophysical Union



Recent Publications (of ~50)

Zidenga, T., Teshima, M., Perkins, G., Rahn, T., Twary, S., Heikoop, J.M. (In Press) Carbon use efficiency diagnostics in Nannochloropsis salina. Algal Research. DOI: https://doi.org/10.1016/j.algal.2018.01.011


Sullivan Graham, E., Dean, C.A., Yoshida, T.M., Twary, S.N., Teshima, M., Alvarez, M.A., Zidenga, T., Heikoop, J.M., Perkins, G.P., Rahn, T.A, Wagner, G.L., Laur, P.M. (2017) Oil and gas produced water as a growth medium for microalgae cultivation: A review and feasibility analysis. Algal Research. DOI: 10.1016/j.algal.2017.01.009.


Basu, A., Schilling, K., Brown, S.T., Johnson, T.M., Christensen, J.N., Hartmann, M., Reimus, P.W., Heikoop, J.M., WoldeGabriel, G. DePaolo, D.J. (2016) Se Isotopes as groundwater redox indicators: Detecting natural attenuation of Se at an in situ recovery U mine. Environmental Science and Technology, v. 50, p. 10833-10842. DOI: 10.1021/acs.est.6b01464.


Placzek, C.J., Heikoop, J.M., House, B., Linhoff, B.S., Pelizza, M. (2016) Uranium isotope composition of waters from South Texas uranium ore deposits. Chemical Geology, v. 437, p. 44 – 55. DOI: 10.1016/j.chemgeo.2016.05.008


Brown, S.T, Basu, A., Christensen, J.N., Reimus, P. Heikoop, J.M., Simmons, A., WoldeGabriel, G., Maher, K., Weaver, K., Clay, J., DePaolo, D.J. (2016) Isotopic evidence for reductive immobilization of uranium across a roll-front mineral deposit. Environmental Science and Technology, v. 50, p. 6189-6198. DOI: 10.1021/acs.est.6b00626


Throckmorton, H.M., Newman, B.D., Heikoop, J.M., Perkins, G.B.,  Feng, X., Graham, D.E., O’Malley, D., Vesselinov, V.V., Young, J., Wullschleger, S.D., Wilson, C.J. (2016) Active layer hydrology in an arctic tundra ecosystem: quantifying water sources and cycling using water stable isotopes.  Hydrological Processes, v. 30, p. 4972-4986. DOI: 10.1002/hyp.10883.


Throckmorton, H.M., Heikoop, J.M., Newman, B.D., Altmann, G.L., Conrad, M.E., Muss, J.D., Perkins, G.B., Smith, L.J., Torn, M.S., Wullschleger, S.D., Wilson, C.J (2015) Pathways and transformations of dissolved methane and dissolved inorganic carbon in Arctic tundra watersheds: Evidence from analysis of stable isotopes. Global Biogeochemical Cycles, v. 29, p. 1893-1910. DOI: 10.1002/2014GB005044


Heikoop, J.M., Throckmorton, H.M., Newman, B.D., Perkins, G.B., Iversen, C.M., Roy Chowdhury, T., Romanovsky, V., Graham, D.E., Norby, R.J, Wilson, C.J., Wullschleger, S.D. (2015) Isotopic identification of soil and permafrost nitrate sources in an Arctic tundra Ecosystem. Journal of Geophysical Research – Biogeosciences, v. 120, p. 1000-1017. DOI: 10.1002/2014JG002883


Basu, A., Brown, S.T., Christensen, J.N., DePaolo, J.D., Reimus, P.W., Heikoop, J.M., Woldegabriel, G., Simmons, A.M., House, B.M., Hartmann, M., Maher, K. (2015) Isotopic and geochemical tracers for U(VI) reduction and U mobility at an in situ recovery U mine. Environmental Science and Technology, v. 49, p. 5939-5947. DOI: 10.1021/acs.est.5b00701


Davis, P., Syme, J., Heikoop, J.M., Fessenden-Rahn, J., Perkins, G., Newman, B., Chrystal, A., Hagerty, S. (2015) Quantifying Uncertainty in Stable Isotope Mixing Models. Journal of Geophysical Research – Biogeosciences, v. 120, p. 903-923. DOI: 10.1002/2014JG002839


Newman, B.D, Throckmorton, H.M., Graham, D.E., Gu, B., Hubbard, S.S., Liang, L., Wu, Y., Heikoop, J.M., Herndon, E.M., Phelps, T.J., Wilson, C.J., Wullschleger, S.D. (2015) Microtopographic and depth controls on active layer chemistry in Arctic polygonal ground. Geophysical Research Letters, v. 42, p. 1808-1817. DOI: 10.1002/2014GL062804


WoldeGabriel, G., Boukhalfa, H., Ware, D.S., Cheshire, M., Reimus, P., Heikoop, J.M., Conradson, S., Batuk, O., Havrilla, G., House, B., Simmons, A.M., Basu, A., Christensen, J.N., Brown, S.T., De Paolo, D. (2014). Characterization of cores from an in-situ recovery mined uranium deposit in Wyoming: Implications for post-mining restoration. Chemical Geology, v. 390, p. 32-45. https://doi.org/10.1016/j.chemgeo.2014.10.009


Cisneros-Dozal, L. M., Huang, Y., Heikoop, J.M. and 11 others. (2014). Assessing the strength of the monsoon during the late Pleistocene in southwestern United States Quaternary Science Reviews, v. 103, p. 81-90. DOI: 10.1016/j.quascirev.2014.08.022


Heikoop, J.M., Johnson, T.J., Birdsell, K.H., Longmire, P., Hickmott, D.D., Jacobs, E.P., Broxton, D.E., Katzman, D.,  Vesselinov, V.V., Ding, M., Vaniman, D.T., Reneau, S.L., Goering, T.J., Glessner, J., Basu, A. (2014) Isotopic evidence for reduction of anthropogenic hexavalent chromium in Los Alamos National Laboratory groundwater.   Chemical Geology, v. 373, p. 1-9. https://doi.org/10.1016/j.chemgeo.2014.02.022