Geoff Wheat uses chemical tracers to understand processes that influence the cycle of elements in the oceans. Much of this work focuses on the transport of fluids through the oceanic crust in a range of settings including hydrothermal systems on mid-ocean ridges and flanks and seepage sites along zones of subduction and in coastal environments. Studies typically include sampling and analyzing fluids and solids, developing transport-reaction models, and relating results to biogeochemical cycles and crustal evolution. Wheat has participated on 79 ocean expeditions of which 49 included a submersible or ROV component. On 26 of these cruises Wheat was either the Chief Scientist or one of two Co-Chief Scientists. Wheat also has participated on two legs of the Ocean Drilling Program and seven expeditions of the Integrated (International) Ocean Drilling (Discovery) Program (IODP).
- Microbial processes
- Scientific deep-sea drilling
- Instrument development
Selected Publications from the past four years:
- Wheat, C. G., Becker, K., Villinger, H., Orcutt, B. N., Fournier, T., Hartwell, A. and Paul, C., 2020. Subseafloor cross-hole tracer experiment reveals hydrologic properties, heterogeneities, and reactions in slow spreading oceanic crust. Geochemistry, Geophysics, Geosystems, 21, e2019GC008804. https://doi.org/10.1029/2019GC008804
- Fryer, P, C. G. Wheat, T. Williams, C. Kelley, K. Johnson, J. Ryan, W. Kurz, J. Shervais, E. Albers, B. Bekins, B. Debret, J. Deng, Y. Dong, P. Eickenbusch, E Frery, Y. Ichiyama, R. Johnston, R. Kevorkian, V. Magalhaes, S. Mantovanelli, W. Menapace, C. Menzies, K. Michibayashi, C. Moyer, K. Mullane, J.-W. Park, R. Price, O. Sissmann, S. Suzuki, K. Takai, B. Walter, R. Zhang, D. Amon, D. Glickson, S. Pomponi, 2019. Mariana serpentinite mud volcanism exhumes subducted seamount materials: Implications for the origin of life, Phil. Trans. R. Soc. A, 378, 20180425.http://dx.doi.org/10.1098/rsta.2018.0425
- Shalev, N., Bontognali, T.R., Wheat, C.G. and Vance, D., 2019. New isotope constraints on the Mg oceanic budget point to cryptic modern dolomite formation. Nature Communications, 10(1), pp.1-10.
- Wheat, C. G., J. S. Seewald, and K. Takai. 2019. Fluid Transport and Reaction Processes Within a Serpentinite Mud Volcano: South Chamorro Seamount, Geochim. Cosmochim. Acta, 269, 15 January 2020, 413-428, https://doi.org/10.1016/j.gca.2019.10.037
- Hulme, S. M., and C.G. Wheat, 2019. Subseafloor fluid and chemical fluxes along a buried‐basement ridge on the eastern flank of the Juan de Fuca Ridge. Geochemistry, Geophysics, Geosystems, 20. https://doi.org/10.1029/ 2019GC008408.
- Ramirez, G. A., A. I. Garber, A. Lecoeuvre, T. D’Angelo, C. G. Wheat, and B. N. Orcutt, 2019. Ecology of Subseafloor Crustal Biofilms. Frontiers in Microbiology, 10, p.1983
- McManus, J., C. G. Wheat, and W. Bach. 2019. Carbon cycling in low temperature hydrothermal systems: The Dorado Outcrop, Geochim. Cosmochim. Acta, 264, 1-12.
- Villinger, H.W., Müller, P., Bach, W., Becker, K., Orcutt, B.N., Kaul, N. and Wheat, C.G., Evidence for low temperature diffuse venting at North Pond, Western flank of the Mid‐Atlantic Ridge. Geochemistry, Geophysics, Geosystems.
- Wheat, C.G., Hartwell, A.M., McManus, J., Fisher, A.T., Orcutt, B.N., Schlicht, L.E., Niedenzu, S. and Bach, W., 2019. Geology and Fluid Discharge at Dorado Outcrop, a Low Temperature Ridge‐Flank Hydrothermal System. Geochemistry, Geophysics, Geosystems, 20(1), pp.487-504.
- Paduan, J.B., Zierenberg, R., Clague, D.A., Spelz‐Madero, R., Caress, D.W., Troni, G., Thomas, H., Glessner, J., Lilley, M.D., Lorenson, T., Lupton, J., Neumann, F., Santa Rosa-del Rio, M. A., and Wheat, C. G. 2018. Discovery of Hydrothermal Vent Fields on Alarcón Rise and in Southern Pescadero Basin, Gulf of California. Geochemistry, Geophysics, Geosystems, doi.org/10.1029/2018GC007771.
- Zinkel, L. A., B. K. Reese, J. McManus, C. G. Wheat, B. N. Orcutt and J. Amend. 2018. Sediment Microbial Communities Influenced by Cool Hydrothermal Fluid Migration. Front. Microbiol. 9:1249. doi: 10.3389/fmicb.2018.01249
- Hartwell, A.M., J. R. Voight, and C. G. Wheat. 2018. Clusters of deep-sea egg-brooding octopods associated with warm fluid discharge: an ill-fated fragment of a larger, discrete population?. Deep Sea Research Part I: Oceanographic Research Papers, 135: 1-8, doi.org/10.1016/j.dsr.2018.03.011
- Wheat, C. G., T. Fournier, K. Monahan, and C. Paul. 2018. Take the plunge: A STEM Camp centered on seafloor science, Current, J. Marine Educators, 31:2, 2-8.
- Tully, B. J., C. G. Wheat, B. T. Glazer, and J. A. Huber. 2017. A dynamic microbial community with high functional redundancy inhabits the cold, oxic subseafloor aquifer, The ISME Journal advance online publication, 3 November 2017; doi:10.1038/ismej.2017.187
- Wheat, C. G., J. McManus, A. T. Fisher, S. M. Hulme, B. N. Orcutt. 2017. Cool Seafloor Hydrothermal Springs Reveal Global Geochemical Fluxes. Earth Planet. Sci. Lett. 476; 179-188, http://dx.doi.org/10.1016/j.epsl.2017.07.049.