A Photo of  Geoffery Wheat

Contact Information

Institute of Marine Science
P. O. Box 475
Moss Landing, CA 95039
Phone: (831) 633-7033
Fax: (831) 633-6872
wheat@mbari.org

Geoffery Wheat Research Full Professor

Geological Oceanography

Affiliations

  • Regional Coord, WC & PRURC, California Office
  • Adjunct Scientist, Monterey Bay Aquarium Research Institute
  • Affiliate Graduate Faculty, University of Hawaii

Specialties

  • low- and high-temperature geochemistry
  • hydrogeology
  • borehole fluid samplers
  • undersea instrumentation

Education

  • B.S. 1983 University of New Hampshire (Mathematics)
  • M.S. 1986 University of Washington (Oceanography)
  • Ph.D. 1990 University of Washington (Oceanography)

Research Overview

I use chemical tracers to understand water-rock reactions in different physical, geochemical, and biological settings, examine effects of fluid flow on diagenetic processes and develop transport- reaction models for these geochemical processes, determine mechanisms of diagenetic reactions, evaluate geochemical cycles and crustal evolution, and conceive experimental approaches to solve geochemical problems.

During the past decade much of my research effort has centered on understanding problems associated with fluid circulation through the oceanic crust; circulation caused by the intrusion of basaltic magma on mid-ocean ridges, differential lithospheric cooling on mid-ocean ridge flanks, compression along zones of subduction, and differences in head gradient on continental shelves and margins. Although these geologic settings and mechanisms for fluid flow are vastly different, in each of these settings the fluid in basement reacts with and changes the crust as it is transported, resulting in chemical, mass, and thermal fluxes to and from the oceans. By examining this range of settings one can study the continued alteration and evolution of the crust as it passes along a continuum from the ridge axis to the flanks before it is ultimately recycled.

Current Research Projects

  • Studies of Deep-sourced mud volcanism in the Mariana Forearc: A DSL 120, Jason ROV, and coring program
  • The thermal state of 20-25 Ma lithosphere subducting at the Costa Rica Margin, implications for hydrogeology, fluxes, and the seismogenic zone
  • Long Term Continuous Monitoring of Pressure, Fluid Chemistry, and Hydrology in Instrumented Boreholes at the Coast Rica Subduction Zone
  • Towards quantifying elemental fluxes and fluid origins from margins using novel submarine instrumentation
  • Sampling and Initial Characterization of Hydrothermal Fluids, Deposits, Microfauna, and Megafauna at Vent Fields along the Eastern Lau Spreading Center
  • The hydrogeological architecture of basaltic ocean crust: CORK experiments for the initial IODP expedition on the flank of the Juan de Fuca Ridge
  • Determining the Limits to Life in Submarine Hydrothermal Systems: Active Sulfide Deposits as Natural Laboratories

Links

Selected Publications

Solomon, E. A., M. Kastner, C. G. Wheat, H. Jannasch, G. Robertson, E. E. Davis, and J. D. Morris. 2009. Long-term hydrogeochemical records in the oceanic basement and forearc prism at the Costa Rica subduction zone, Earth Planet. Sci. Lett., 282, 240-251, doi:10.1016/j.epsl.2009.03.022.

Beck, E., W. Kirkwood, D. Caress, T. Berk, P. Mahacek, K. Brashem, J. Acain, V. Reddy C. Kitts, J. Skutnik, C. G. Wheat. 2009. SeaWASP: A small waterplane area twin hull autonomous platform for shallow water mapping, Mar. Tech. Soc. J., 43 (1), 6-12.

Wheat, C. G., and A. T. Fisher. 2008. Massive, low-temperature hydrothermal flow from a basaltic outcrop on 23 Ma seafloor of the Cocos Plate: Chemical constraints and implications, Geochem. Geophys. Geosyst., 9, Q12O14, doi:10.1029/2008GC002136.

Wheat, C. G. and J. McManus. 2008. Germanium in Mid-Ocean Ridge Flank Hydrothermal Fluids, Geochem. Geophys. Geosyst, 9, Q03025, doi:10.1029/2007GC001892.

Bodeï, S., M. Buatier, M. Steinmann, T. Adatte, and C.G. Wheat. 2008. Characterization of metalliferous sediment from a low-temperature hydrothermal environment on the Eastern Flank of the East Pacific Ridge. Mar. Geo., 250, 128-141, doi:10.1016/j.margeo.2008.01.003.

Wheat, C. G. P. Fryer, A. T. Fisher, S. Hulme, H. Jannasch, M. J. Mottl, K. Becker. 2008. Borehole observations of fluid flow from South Chanorro Seamount, an active serpentinite mud volcano in the Mariana forearc, Earth, Planet. Sci. Lett., 267, 401-409, doi:10.1016/j.epsl.2007.11.057.

Hulme, S.M., C. G. Wheat, R. M. Coggon, and J. McManus. 2008. Data report: trace element, Sr isotope, and Ge/Si composition of fluids and sediments in ridge-flank low-temperature hydrothermal environments. In Fisher, A.T., Urabe, T., Klaus, A., and the Expedition 301 Scientists, Proc. IODP, 301: College Station, TX (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.301.202.2008.

Wheat, C. G., and A. T. Fisher. 2007. Seawater recharge along an eastern bounding fault in Middle Valley, northern Juan de Fuca Ridge, Geophys. Res. Lett., 34, L20602, doi:10.1029/2007GL031347.

Ruehl, C. R., A. T. Fisher, M. Los Huertos, S. D. Wankel, C. G. Wheat, C. Kendall, C. E. Hatch, and C. Shennan, 2007. Nitrate dynamics in the Pajaro River: A nutrient-rich losing stream, J. N. Am. Benthol. Soc., 26(2): 191-206.

Kastner M., K. Becker, E. E. Davis, A. T. Fisher, H. W. Jannasch, E. A. Solomon, C. G. Wheat, 2006. New Insights Into the Hydrogeology of the Ocean Crust through Long-Term Monitoring, Oceanography, 19 (4), 30-42.

Nakagawa, S., F. Inagaki, Y. Suzuki, B. O. Steinsbu, M. A. Lever, K. Takai, B. Engelen, Y. Sako, C. G. Wheat, K. Horikoshi, and Integrated Ocean Drilling Program Expedition 301 Scientists. 2006. Microbial community in black rust exposed to hot ridge-flank crustal fluids, Applied and Environmental Microbiology, Oct. 2006, 6789-6799.

Fisher, A. T., C. G. Wheat, K. Becker, E. E. Davis, H. Jannasch, D. Schroeder, R. Dixon, T. L. Pettigrew, R. Meldrum, R. Macdonald, M. Nielsen, M. Fisk, J. Cowen, W. Bach, and K. Edwards, 2005. Scientific and Technical Design and Deployment of Long-term, Subseafloor Observatories for Hydrogeologic and Related Experiments, IODP Expedition 301, Eastern Flank of Juan de Fuca Ridge In Fisher, A. T. , Urabe, T., Klaus, A., and the Expedition 301 Scientists, Proc. IODP, 301: College Station, TX (Integrated Ocean Drilling Program Management International, Inc.),doi:10.2204/iodp.proc.301.103.2005, 1-39.

Wheat, C.G., and J. McManus. 2005. The potential role of ridge-flank hydrothermal systems on oceanic germanium and silicon balances. Geochim. Cosmochim. Acta, 69, (8), 2021-2029.

Wheat, C. G., M. J. Mottl, A. J. Fisher, D. Kadko, E. E. Davis, E. Baker. 2004. Heat Flow Through a Basaltic Outcrop on a Sedimented Young Ridge Flank. Geochem. Geophys. Geosyst., 5, Q12006, doi: 10.1029/2004GC000700.

Mottl, M. J., C. G Wheat, P. Fryer, J. Gharib, and J. B. Martin. 2004. Chemistry of springs across the Mariana forearc shows progressive devolatilization of the subducting slab. Geochim. Cosmochim. Acta, 68 (23), 4915-4933.

Buatier, M.D., D. Guillaume, C. G. Wheat, L. Hervé and, T. Adatte. 2004. Mineralogical characterization and genesis of hydrothermal Mn oxides from the flank of the Juan the Fuca Ridge. Am. Miner., 89, 1807-1815.

Wheat, C. G. and M. J. Mottl. 2004. Chapter 19: Geochemical Fluxes Through Ridge Flanks, In, Hydrolgeology of the Oceanic Lithosphere, Ed. E. E. Davis and H. Elderfield, Cambridge University Press, 627-658.

Wheat, C.G., H.W. Jannasch, M. Kastner, J.N. Plant, E.H. DeCarlo, and G. Lebon. 2004. Venting Formation Fluids from Deep Sea Boreholes in a Ridge Flank Setting: ODP Sites 1025 and 1026. Geochem. Geophys. Geosyst., 5 (8), Q08007, doi:10.1029/2004GC000710.

Jannasch H. W., C. G. Wheat, J. Plant, M. Kastner, and D. Stakes. 2004. Continuous chemical monitoring with osmotically pumped water samplers: OsmoSampler design and applications. Limnol. Oceanogr.: Methods, 2, 102-113.

Spinelli, G., L. Zuhlsdorff, A. T. Fisher, C. G. Wheat, M. Mottl, V. Spiez, and E. R. Giambalvo. 2004. Hydrothermal seepage patterns above a buried basement ridge, eastern flank of the Juan de Fuca Ridge. J. Geophys. Res., 109 (B1), B01102 , doi: 10.1029/2003JB002476.

Jannasch, H. W., E. E. Davis, M. Kastner, J. D. Morris, T. L. Pettigrew, J. N. Plant, E. A. Solomon, H. W. Villinger, C. G. Wheat. 2003. CORK II: Long-Term monitoring of fluid chemistry, fluxes, and hydrology in instrumented boreholes at the Costa Rica subduction zone. In Morris, J.D., H. W. Villinger, A. Klaus, et al., Proc. ODP, Init. Repts, 205, 1-36 [CD-ROM], College Station, TX (Ocean Drilling Program).

Wheat, C.G., H.W. Jannasch, M. Kastner, J.N. Plant, and E.H. DeCarlo. 2003. Seawater Transport and reaction in upper oceanic basaltic basement: Chemical data from continuous monitoring of sealed boreholes in a mid-ocean ridge flank environment. Earth Planet. Sci. Lett., 216, 549-564, 2003.

Wheat, C.G., J. McManus, M.J. Mottl, and E. Giambalvo. 2003. Oceanic Phosphorus Imbalance: The Magnitude of the Ridge-Flank Hydrothermal Sink. Geophys. Res. Lett., 30(17), 1895, doi: 10.1029/2003GL017318, 2003.

Davis, A.S., D. A. Clague, R. A. Zierenberg, C. G. Wheat, and B.L. Cousens. 2003. Sulfide formation related to changes in the hydrothermal system on Loihi Seamount, Hawai’i, following the seismic event in 1996. Canadian Mineralogist, 41: 457-472.

Fisher, A. T., E. E. Davis, M. Hutnak, V. Spiess, L. Zuhlsdorff, A. Cherkaoui, L. Christiansen, K. Edwards, B. Macdonald, H. Villinger, M. J. Mottl, C. G. Wheat, and K. Becker. 2003. Hydrothermal recharge and discharge across 50 km guided by seamounts on a young ridge flank. Nature, 421: 618-621.

McManus, J., T. F. Nägler, C. Siebert, C. G. Wheat, and D. Hammond. 2002. Oceanic molybdenum isotope fractionation: Diagenesis and hydrothermal ridge-flank alteration. Geochem. Geophys. Geosyst., 3(12), 1078, doi:10.1029/2002GC000356, 2002.

Spinelli, G., A. T. Fisher, C. G. Wheat, M. D. Tryon, K. M. Brown, and A. R. Flegal. 2002. Groundwater seepage into northern San Francisco Bay: Implications for dissolved metals budgets. Water Resources Res., 38(7), 10.1029/2001WR000827, 17 July 2002.

Wheat, C. G., M. J. Mottl, and M. Rudniki. 2002. Trace Element and REE Composition of a Low-Temperature Ridge Flank Hydrothermal Spring. Geochim. Cosmochim. Acta, 66: 3693-3705.

Fisher, A. T., H. Villinger, R. N. Harris, R. P., Von Herzen, M. Pfender, M. Müller, I., Grevemeyer, N. Kaul, and C. G. Wheat. 2002. Comments on "Deep-penetration Heat Flow Probes Raise Questions about Interpretations from short Probes, by Géli et al, EOS Trans., Am. Geophys. Union, 82 (29), 317,320, 2001", EOS Trans., Am. Geophys. Union, 83: 196.

Giambalvo, E. C. I. Steefel, A. T. Fisher, N. D. Rosenberg, C. G. Wheat. 2002. Effects of fluid-sediment reaction on hydrothermal fluxes of major elements, eastern flank of the Juan de Fuca Ridge. Geochim. Cosmochim. Acta, 66: 1739-1757.

Butterfield, D. A., B. K. Nelson, C. G. Wheat, M. J. Mottl, and K. K. Roe. 2001. Evidence for basaltic Sr in midocean ridge-flank hydrothermal systems and implications for the global oceanic Sr isotope balance. Geochim. Cosmochim. Acta, 65: 4141-4153.

Monnin C., C. G. Wheat, B. Dupre, H. Elderfield, and M. Mottl. 2001. Barite stability in marine sediments: Implication for the flux of hydrothermal barium from ridge flanks settings. Geochem. Geophys. Geosyst., 2, paper number 2000GC000073, 15 pages.

Wheat, C. G., H. W. Jannasch, J. N. Plant, C. L. Moyer, F. J. Sansone, and G. M. McMurtry. 2000. Continuous sampling of hydrothermal fluids from Loihi Seamount after the 1996 event. J. Geophys. Res., 105: 19353-19368.

Becker, N. C., C. G. Wheat, M. J. Mottl, J. L. Karsten, and E. E. Davis. 2000. A geological and geophysical investigation of Baby Bare, locus of a ridge-flank hydrothermal system in the Cascadia Basin. J. Geophys. Res., 105: 23557-23568.

Wheat, C. G., H. Elderfield, M. J. Mottl, and C. Monnin. 2000. Chemical composition of basement fluids within an oceanic ridge flank: Implications for along-strike and across-strike hydrothermal circulation. J. Geophys. Res., 105: 13437-13447.

Wheat, C. G., and M. J. Mottl. 2000. Composition of pore and spring waters from Baby Bare: Global implications of geochemical fluxes from a ridge flank hydrothermal system. Geochim. Cosmochim. Acta, 64: 629-642.

Mottl, M. J., C. G. Wheat, C. Monnin, and H. Elderfield. 2000. Data report: Trace elements and isotopes in pore water from ODP Sites 1023 through 1032, eastern flank of the Juan de Fuca Ridge. Proc. ODP, Sci. Results, 168: 105-115.

Elderfield, H, C. G. Wheat, M. J. Mottl, C. Monnin, B. Spiro. 1999. Fluid and geochemical transport through oceanic crust: A transect across the eastern flank of the Juan de Fuca Ridge. Earth Planet. Sci. Lett., 172: 151-169.

Fryer, P., C. G. Wheat, and M. J. Mottl. 1999. Mariana Blueschist Mud Volcanism: Implications for conditions within the subduction zone. Geology, 27: 103-106.

Sansone, F. J., M. J. Mottl, E. J. Olson, C. G. Wheat, and M. D. Lilley. 1998. CO2-depleted fluids from mid-ocean ridge-flank hydrothermal springs. Geochim. Cosmochim. Acta, 62: 2247-2252.

Wheat, C. G., J. McManus, J. Dymond, R. Collier, and M. Whiticar. 1998. Hydrothermal fluid circulation through the sediment of Crater Lake, Oregon: Pore water and heat flow constraints. J. Geophys. Res., 103: 9931-9944.

Mottl, M. J., C. G. Wheat, E. Baker, N. Becker, E. Davis, R. Feely, A. Grehan, D. Kadko, M. Lilley, G. Massoth, C. Moyer, and F. Sansone. 1998. Warm springs discovered on 3.5 Ma-old oceanic crust, eastern flank of the Juan de Fuca Ridge. Geology, 26: 51-54.

Karsten, J. L., N. Becker, M. J. Mottl, and C. G. Wheat. 1998. Petrology of Baby Bare and Mama Bare lavas. Geophys. Res. Lett., 25: 117-120.

Wheat, C. G., M. J. Mottl, E. T. Baker, R. A. Feely, J. E. Lupton, F. J. Sansone, J. A. Resing, G. T. Lebon, and N.C. Becker. 1997. Chemical anomalies in the water column from low-temperature hydrothermal venting on the eastern flank of the Juan de Fuca Ridge. J. Geophys. Res., 102: 15433-15446.

The 1996 Loihi Science Team. 1997. Researchers rapidly respond to submarine activity at Loihi Volcano, Hawaii. EOS, 78: 229-233.

Davis, E.E., A. T. Fisher, J. V. Firth, and the ODP Leg 168 Scientific Party. 1997. Drilling program traces fluid circulation through Juan de Fuca Ridge crust. EOS, 78: 187-189.

Wheat, C. G., R. A. Feely, and M. J. Mottl. 1996. Phosphate removal by oceanic hydrothermal processes: An update of the phosphate budget of the oceans. Geochim. Cosmochim. Acta, 60: 3593-3608.

McManus, J., R. Collier, J. Dymond, C. G. Wheat, and G. Larson. 1996. Using the deep lake oxygen budget in Crater Lake, Oregon to constrain mixing, carbon flux, and hydrothermal inputs. Limnol. Oceanogr., 41: 722-731.

Mottl, M. J., F. J. Sansone, C. G. Wheat, J. A. Resing, E. T. Baker, and J. E. Lupton. 1995. Manganese and methane in hydrothermal plumes along the East Pacific Rise, 8E40' to 11E50'N. Geochim. Cosmochim. Acta, 59: 4147-4165.

Wheat, C. G. and R. E. McDuff. 1995. Mapping the fluid flow of the Mariana Mounds off-axis hydrothermal system: Pore water chemical tracers. J. Geophys. Res., 100: 8115-8131.

Baker, E. T., R. A. Feely, M. J. Mottl, F. J. Sansone, C. G. Wheat, J. A. Resing, and J. E. Lupton. 1994. Hydrothermal plumes along the East Pacific Rise, 8E40' to 11E50'N: Plume distribution and relationship to the apparent magmatic budget. Earth Planet. Sci. Lett., 128: 1-17.

Wheat, C. G. and J. Tribble. 1994. Diagenesis of amorphous silica in Middle Valley, Juan de Fuca Ridge. In: Mottl, M. J., Dais, E. E., Fisher, A. T., and Slack, J. F. (Eds.), Proc. ODP, Sci. Results, 139: College Station, TX (Ocean Drilling Program), 341-349.

Wheat, C. G., J. Boulegue, and M. J. Mottl. 1994. A technique for obtaining pore water chemical composition from indurated and hydrothermally altered sediment and basalt: The Ground Rock Interstitial Normative Determination (GRIND). In: Mottl, M. J., Dais, E. E., Fisher, A. T., and Slack, J. F. (Eds.), Proc. ODP, Sci. Results, 139: College Station, TX (Ocean Drilling Program), 429-437.

Butterfield, D.A., R. E. McDuff, J. M. Franklin, and C. G. Wheat. 1994. Geochemistry of hydrothermal vent fluids from Middle Valley, Juan de Fuca Ridge. In: Mottl, M. J., Dais, E. E., Fisher, A. T., and Slack, J. F. (Eds.), Proc. ODP, Sci. Results, 139: College Station, TX (Ocean Drilling Program), 395-410.

Mottl, M. J., C. G. Wheat, and J. Boulegue. 1994. Timing of ore deposition and sill intrusion at Site 856: Evidence from stratigraphy, alteration, and sediment pore-water composition. In: Mottl, M. J., Dais, E. E., Fisher, A. T., and Slack, J. F. (Eds.), Proc. ODP, Sci. Results, 139: College Station, TX (Ocean Drilling Program), 679-693.

Wheat, C. G. and M. J. Mottl. 1994. Data Report: Trace metal composition of pore water from Sites 855 through 858, Middle Valley, Juan de Fuca Ridge. In: Mottl, M. J., Dais, E. E., Fisher, A. T., and Slack, J. F. (Eds.), Proc. ODP, Sci. Results, 139: College Station, TX (Ocean Drilling Program), 749-755.

Wheat, C. G. and R. E. McDuff. 1994. Hydrothermal flow through the Mariana Mounds: Dissolution of amorphous silica and degradation of organic matter on a mid-ocean ridge flank. Geochim. Cosmochim. Acta, 58: 2461-2475.

Mottl, M. J. and C. G. Wheat. 1994. Hydrothermal circulation through mid-ocean ridge flanks: Fluxes of heat and magnesium. Geochim. Cosmochim. Acta, 58: 2225-2237.

Wheat, C. G. and M. J. Mottl. 1994. Hydrothermal circulation, Juan de Fuca Ridge eastern flank: Factors controlling basement water composition. J. Geophys. Res., 99: 3067-3080.

Lupton, J. E., E. T. Baker, M. J. Mottl, F. J. Sansone, C. G. Wheat, J. A. Resing, G. J. Massoth, C. I. Measures, and R. A. Feely. 1993. Chemical and physical diversity of hydrothermal plumes along the East Pacific Rise, 8E45'N to 11E50'N. Geophys. Res. Lett., 20: 2913-2916.

Davis, E. E., D. S. Chapman, M. J. Mottl, W. J. Bentkowski, K. Dadey, C. Forster, R. Harris, S. Nagihara, K. Rohr, C. G. Wheat, and M. Whiticar. 1992. FlankFlux: An experiment to study the nature of hydrothermal circulation in young sea floor. Can. J. Earth Sci., 29: 925-952.

Wheat, C. G. 1990. Fluid circulation and diagenesis in an off-axis hydrothermal system: The Mariana Mounds. Ph. D. Dissertation, University of Washington, Seattle, WA. pp. 204.

Wheat, C. G. and R. Carpenter. 1988. MnCl- and MnSO40 association constants to 170EC. J. Solution Chem., 17: 467-480.

Loder, T.C., J. A. Love, J. Kim, and C. G. Wheat. 1983. Nutrient and hydrographic data for the Great Bay Estuarine System, New Hampshire-Maine, Part II, January, 1976-June 1978. University of New Hampshire Marine Program Report UNH-MP-D/TR-SG-83-4. 149 pp.

Workshop Reports, Non-refereed Papers, and Extended Abstracts:

Beck, E., T. Berk, J. Skutnik, P. Mahacek, J. Acain, V. Reddy, W. Kirkwood, C. G. Wheat, C. Kitts, D. Caress, 2008, SeaWASP: A Small Waterplane Area Twin Hull Autonomous Platform for Shallow Water Mapping, AUV 2008 Conference, October 13-14.

Fryer, P., C. G. Wheat, D. Weins, C. Moyer, and A. Fisher. 2006. A plate boundary observatory on the Mariana Forearc, Margins Newsletter, 16 (Spring), 16-18.

Brown, K., A. Newman, R. Stevens, K. McIntosh, N. Bangs, D. Chadwell, S. Bilek, G. Spinelli, S. Schwartz, L. Dorman, E. Silver, D. Hilton, M. Kastner, G. McMurty, and C. G. Wheat. 2006. A plate boundary observatory at Costa Rica, Margins Newsletter, 16 (Spring), 16-18.

Becker, K., E. E. Davis, A. T. Fisher, A. Klaus, D. Schroeder, M. Storms, T. Pettigrew, and C. G. Wheat, 2006. ODP/IODP "CORK" Long-term subseafloor hydrogeologic observatories. OTC paper number 18014.

Weins, D., C. G. Wheat, F. Martinez, and C. Langmuir, 2005. Status report on the Lau Basin ISS, Ridge 2000 Events, 3, 11-13.

Wheat, C.G., H. Jannasch, P. Fryer, E. Davis, K. Becker, and M. Edwards. 2003. One year down, one to go: The CORK at ODP Site 1200. JOI/USSAC Newsletter, 16: 5.

Murray, R. W., D. P. Schrag, and C. G. Wheat. 2002. Opportunities in Geochemistry for post-2003 ocean drilling. USSSP/JOI Workshop. Washington D. C., 20 pp.

Murray, R. W., D. P. Schrag, and C. G. Wheat. 2002. Opportunities in Geochemistry for post-2003 drilling: Preparing for the Integrated Ocean Drilling Program (IODP). The Geochemical News, 113: 20-27.

Monnin C., C. G. Wheat, M. J. Mottl, and S. Balleur. 2001. The influence of basement fluid upwelling and diagenesis on the calcium carbonate stability in sediments from the eastern flank of the Juan de Fuca ridge (NE Pacific), Proceedings of WRI10 Symposium, Villasimius, Sardinia, 10-17 Juin 2001 (Rosa Cidu Ed.), 639-642.

Reynolds, J. R., R. C. Highsmith, B. Konar, C. G. Wheat, D. Doudna. 2001. Fisheries and fisheries habitat investigations using undersea technology. MTS, 1-9.

Murray, R., D. Schrag, G. Wheat. 2001. Opportunities in Geochemistry for Post-2003 Ocean Drilling. JOI/USSAC Newsletter, 13 (3): 10-11.

Chadwick, W., E. Baker, D. Butterfield, P. Canales, S. Carbotte, D. Caress, D. Chadwell , R. Detrick, J. Diebold, A. Harding, J. Hildebrand, H. Jannasch, K. Johnson, G, Kent, R. Koski, J. Morton, W. Normark, M. Perfit, C. Reiss, G. Sasagawa, M. Smith, F. Spiess, D. Stakes, M. A. Tivey, S. Tucker, G. Wheat, and M. Zumberge. 2000. RIDGE Seafloor Observatory at the Cleft segment: Investigation of linkages between Geodetic, Geophysical, Geochemical, and Water Column Processes. RIDGE Newsletter 11 (1): 18-24.

Tivey, M.K., K. Bemis, A.M. Bradley, D. Butterfield, J.R. Delaney, K. Ding, R.P. Dziak, C. Fisher, C.G. Fox, S. Hautala, D. Jackson, H.W. Jannasch, H. P. Johnson, S.K. Juniper, D. Kadko, D.S. Kelley, M. Lilley, R.E. McDuff, P. Rona, J. Sarrazin, A. Schultz, W.E. Seyfried Jr., R.E. Thomson, C. G. Wheat, W. Wilcock, D. Wright, and D. Yoerger. 2000. The RIDGE Endeavour Segment Seafloor Observatory: Recent Successes and an Overview of Coordinated Experiments for Y2K. RIDGE Newsletter 11 (1): 10-17.

Devey, C. W., H. Villinger, I. Grevemeyer, J. Hauschild, K. Lackschewitz, N. Kaul, M. Mottl, M. Pfender, B. Schramm, G. Wheat, and the scientific party EXCO II, Legs 1 and 2. 2000. The fourth dimension in ridge studies: Sampling along a flow-line corridor 0-9 Ma at 14°S on the EPR. InterRidge News 9 (2): 34-36.

Monnin C., B. Dupre, J. Jeandel, H. Elderfield, G. Wheat, and M. Mottl. 1998. Barite stability in ocean waters and in marine sediments: a thermodynamic approach. Miner. Mag., 62A: 1015-1016.

Jannasch, H., C. Sakamoto, T. Chapin, K. Johnson, G. Wheat, T. Dickey. 1998. In situ analyzers and samplers for long-term oceanographic monitoring. Marine Technology society (Baltimore, 16-19 November).

Wheat, C. G., H. W. Jannasch, C. L. Moyer, F. J. Sansone, and J. N. Plant. 1998. A New Continuous Water Sampler for Monitoring Hydrothermal Fluids: Data From Loihi Seamount After the 1996 Event. RIDGE Newsletter, 9 (1): 6-10.

Jannasch, H., C. Sakamoto, G. Wheat, and K. Johnson. 1997. Osmotically pumped chemical analyzers and samplers for long-term oceanographic monitoring. Extended Abstract; International Workshop in Marine Analytical Chemistry for Monitoring and Oceanographic Research (Brest, France, 17-19 November).

Wheat, C. G. 1997. Oceanic groundwater. ODP Greatest Hits, College Station, TX (Ocean Drilling Program).

Wheat, C. G. and C. L. Van Dover. 1996. Monterey Bay Initiative. West Coast National Undersea Research Center, NOAA's National Undersea Research Program. 7 p.

Van Dover, C. L. and C. G. Wheat. 1996. Gulf of Alaska Initiative. West Coast National Undersea Research Center, NOAA's National Undersea Research Program. 5 p.

Mottl, M., E. Baker, K. Macdonald, J. Sinton, and G. Wheat. 1996. Processes and fluxes on a superfast spreading ridge: The southern East Pacific Rise. RIDGE Workshop Report, 36 p.