Jim McManus, PhD

Senior Research Scientist
Vice President for Research and Administration
Phone: +1 (207) 315-2567, ext. 307
Fax: +1 (207) 315-2329

For media inquiries, please contact sprofaizer@bigelow.org


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

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

Research Interests

Jim’s research focuses on a number of broad issues related to the Earth's biogeochemistry. This research includes specific studies on past climate and geochemical cycles, modern geochemical processes, and how anthropogenic perturbations might influence biogeochemical cycles in the future. His research includes examining elemental cycling in the ocean, estuaries, rivers, and lakes.



  • 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.


  • Scholz, F., Severmann, S., McManus, J., Hensen, C., (2014) Beyond the Black Sea paradigm: The sedimentary fingerprint of an open-marine iron shuttle, Geochim. Cosmochim. Acta, 127, 368-380.
  • Deutsch, C., Berelson, W., Thunell, R., Weber, T., Tems, C., McManus, J., Crusius, J., Ito, T., Baumgartner, T., Ferreira, V., Mey, J., van Geen, A. (2014) Centennial changes in North Pacific anoxia linked to tropical trade winds, Science, 345, 665-66
  • Chong, L.S., Berelson, W.M., McManus, J., Hammond, D.E., Rollins, N.E., Yager, P.L. (2014) Carbon and biogenic silica export influenced by the Amazon River plume: Patterns of remineralization in deep-sea sediments. Deep Sea Research, 85: 124-137.
  • Scholz, F., McManus, J., Sommer, S. (2013) The Manganese and iron shuttle in a modern euxinic basin and implications for molybdenum cycling at euxinic ocean margins. Chemical Geology, 355, Pages 56–68.


  • Goldberg, T., Gordon, G., Izon, G., Archer, C., Pearce, C.R., McManus, J., Anbar, A.D., and Rehkämper, M. (2013) Resolution of inter-laboratory discrepancies in Mo isotope data: an intercalibration. J. Anal. At. Spectrom., 28, 724, DOI: 10.1039/C3JA30375F.
  • Berelson, W.M., McManus, J., Severmann, S., Reimers, C.E. (2013) Benthic flux of oxygen and nutrients across Oregon/California shelf sediments. Continental Shelf Research, 55, 66-75.
  • Roy, M., McManus, J., Goñi, M.A., Chase, Z., Borgeld, J.C., Wheatcroft, R.A., Muratli, J.M., Megowan, M.R., Mix, A. (2013). Reactive iron and manganese distributions in seabed sediments near small mountainous rivers off Oregon and California, (USA). Continental Shelf Research, 54, 67-69.
  • McManus J., Berelson, W.M., Severmann, S., Johnson, K.S., Hammond, D.E., Roy, M., Coale, K.H. (2012) Benthic manganese fluxes along the Oregon-California continental shelf and slope, Continental Shelf Research, 43: 71-85.


  • Ziebis, W., McManus, J., Ferdelman, T., Schmidt-Schierhorn, F., Bach, W., Muratli, J., Edwards, K.J., Villinger, H. (2012) Interstitial fluid chemistry of sediments underlying the North Atlantic gyre and the influence of subsurface fluid flow. Earth Planet. Sci. Letts., 323- 324, 79-91.
  • Muratli, J.M., McManus, J., Mix, A., Chase, Z. (2012) Dissolution of fluoride complexes following microwave-assisted hydrofluoric acid digestion of marine sediments. Talanta, 89, 195-200.
  • Chong, L.S., Prokopenko, M.G., Berelson, W.M., Townsend-Small, A., McManus, J. (2012) Nitrogen cycling within suboxic and anoxic sediments from the continental margin of Western North America. Marine Chemistry, 128-129, 13-25.
  • Homoky, W., Severmann, S., McManus, J., Berelson, W.M., Riedel, T.E., Statham, P.J., Mills, R.A. (2012) Dissolved oxygen and suspended particles regulate the benthic flux of iron from continental margins. Marine Chemistry, 134-135, 59-70.
  • Poulson Brucker, R., McManus, J., Poulton, S.W. (2012) Molybdenum isotope fractionations observed under anoxic experimental conditions, Geochem. J., 46: 201-209.