Jim McManus, PhD

National Science Foundation

For media inquiries, please contact sprofaizer@bigelow.org


B.S., Chemistry, Stockton State College, 1986

Ph.D., Oceanography, Oregon State University, 1992

Research Interests

My research focuses on the chemical reactions that occur within marine sediments and how those reactions influence ocean chemistry through time. This research has tight connections to how we interpret the geologic record as many of the elements that I study serve as proxies for past ocean chemistry and biology. Through my research, I spend a significant amount of time in the field, and I have accumulated several years of field experience over the past three decades. I have participated in large multi-investigator programs such as the Joint Global Ocean Flux Study (JGOFS), IODP expeditions, and many other expeditions of varying size and length. I have also worked in freshwater systems including Crater Lake (Oregon), Lake Superior, and Lake Tanganyika.



  • Little, SH., Archer, C., McManus, J., Najorka, J., Wegorsewski, AV., Vance, D. (2020) Towards balancing the oceanic Ni budget, Earth and Planetary Sci. Letts. 547, 116461


  • McManus, J., Wheat, CG., Bach, W. (2019) Carbon cycling in low temperature hydrothermal systems: The Dorado Outcrop, Geochimica et Cosmochimica Acta, 264, 1-12.
  • Wheat, CG., Hartwell., AM., McManus, J., Fisher, AT., Orcutt, BN., Schlicht, LEM., Niedenzu, S., Bach, W. (2019) Geology and fluid discharge at Dorado Outcrop, a low temperature ridge-flank hydrothermal system, Geochemistry, Geophysics, Geosystems, 20(1), 487-504.
  • Berelson, WM., McManus, J., Severmann, S., Rollins, N. (2019) Benthic fluxes from hypoxia-influennced Gulf of Mexico sediments: Impact on bottom water acidification, Marine Chemistry, 209, 94-106.


  • Chong, LS., Berelson, WM., McManus, J., Rollins, NE. (2018) Meter-scale early diagenesis of organic matter buried within deep-sea sediments beneath the Amazon river plume, Frontiers in Marine Science, 5, 250.
  • Zinke, LA., Reese, BK., McManus, J., Wheat, CG., Orcutt, BN., Amend, JP. (2018) Sediment microbial communities influenced by cool hydrothermal fluid migration Frontiers in microbiology, 9, 1249.
  • Murray, NA., McManus, J., Palmer, MR., Haley, B., Manners, H. (2018) Diagenesis in tephra-rich sediments from the Lesser Antilles Volcanic Arc: Pore fluid constraints, Geochimica et Cosmochimica Acta, 228, 119-135.
  • Beam, J.P., Scott, J.J., McAllister, S.M., Chan, C.S., McManus, J., Meysman, F.J.R., Emerson, D. (2018) Biological rejuvenation of iron oxides in bioturbated marine sediments. ISME Journal (in press) 10.1038/s41396-017-0032-6.


  • Haley, B.A., Du, Jianghui, Abbott, A.N., McManus, J. (2017) The impact of benthic processes on rare earth element and neodymium isotope distributions in the oceans. Front. Mar. Sci. doi: 10.3389/fmars.2017.00426 (in press)
  • Wheat, C.G., Fisher, A.T., McManus, J., Hulme, S.M., Orcutt, B.N. (2017) Cool seafloor hydrothermal springs reveal global geochemical fluxes. Earth and Planetary Science Letters, 476, 179-188.
  • Yang, J., Torres, M., McManus, J., Algeo, T.J., Hakala, J.A., Verba, C. (2017) Controls on rare earth element distributions in ancient organic-rich sedimentary sequences: Role of post-depositional diagenesis of phosphorus. Chemical Geology, 466, 533-544.
  • Little, S.H., Vance, D., McManus, J., Severmann, S., Lyons, T.W. (2017) Copper isotope signatures in modern marine sediments (2017) Geochimica et Cosmochimica Acta 212, 253-273.
  • Baronas, J., Hammond, D.E., McManus, J., Wheat, C.G., Siebert, C. (2017) Germanium-silicon fractionation in a river-influenced continental margin: The Northern Gulf of Mexico. Geochimica et Cosmochimica Acta 203, 265-283.


  • Abbott, A.N., Haley, B.A., McManus, J. (2016) The impact of sedimentary coatings on the diagenetic Nd flux. Earth and Planetary Sci. Letters, 449, 217-277.
  • Baronas, J., Hammond, D.E., Berelson, W.M., McManus, J., Severmann, S. (2016) Germanium-silicon fractionation in a river-influenced continental margin: The Northern Gulf of Mexico. Geochimica et Cosmochimica Acta 178, 124-142.
  • Little, S.H., Vance, D., McManus, J., Severmann, S. (2016) Key role of continental margin sediments in the oceanic mass balance of Zn and Zn isotopes. Geology, 44, 207-210.
  • Coussens, M.F. and many others (2016) Synthesis: stratigraphy and age control for IODP Sites U1394, U1395, U1396 offshore Montserrat in the Lesser Antilles. In: Le Friant, A., Ishizuka, O., Stroncik, N.A., and the Expedition 340 Scientists Proceedings of the Integrated Ocean Drilling Program, 340, 1-19. doi:10.2204/iodp.proc.340.204.2016.
  • Murray, N.A., Muratli, J.M., Hartwell, A.M., Manners, H., Megowan, M.R., Goñi, M., Palmer, M., and McManus, J. (2016) Data report: dissolved minor element compositions, sediment major and minor element concentrations, and reactive iron and manganese data from the Lesser Antilles volcanic arc region, IODP Expedition 340 Sites U1394, U1395, U1396, U1399, and U1400. In Le Friant, A., Ishizuka, O., Stroncik, N.A., and the Expedition 340 Scientists, Proceedings of the Integrated Ocean Drilling Program, 340: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.340.207.2016


  • Abbott, A.N., B.A. Haley, J. McManus, (2015) Bottoms up: Sedimentary control on the deep ocean’s εNd signature. Geology, 43 (11), 1035-1038.
  • Abbott, A.N., B.A. Haley, J. McManus, Reimers, C. (2015) The sedimentary flux of dissolved rare earth elements to the ocean. Geochim. Cosmochim. Acta, 154, 186-200.
  • Little, S.H., Vance, D., Lyons, T.W., McManus, J. (2015) Controls on trace metal authigenic enrichment in reducing sediments: Insights from modern oxygen-deficient settings, Am. J. Sci., 315 (2), 77-119.
  • McManus, J., Severmann, S., Cohen, A.S., McKay, J.L., Montanye, B.R., Hartwell, A.M., Wheatcroft, R. (2015) The sedimentary response to a rapid change in lake level in Lake Tanganyika, Palaeogeogr., Palaeoclim., Palaeoecol., 440, 647-658.
  • Torres, M.E., Cox, T., Hong, W-L., McManus, J., Sample, J.C., Destrigneville, C., Gan, H.M., Gan, H.Y., Moreau, J.W. (2015) Crustal fluids and ash alteration impact on the biosphere of Shikoku Basin sediments, Nankai Trough, Japan, Geobiology, 13: 562-580.
  • Scholz, F., J. McManus, A.C. Mix, C. Hensen, R.R. Schneider, (2014) The impact of ocean deoxygenation on iron release from continental margin sediments. Nature Geoscience, 7, 433-437.