Eoghan P. Reeves's picture

Eoghan P. Reeves

Associate Professor, in Aqueous Geochemistry
  • E-mailEoghan.Reeves@uib.no
  • Phone+47 55 58 87 53
  • Visitor Address
    Realfagbygget, Allégt. 41
  • Postal Address
    Postboks 7803
    5020 Bergen

Welcome, visitors!

My hydrothermal research group aims to understand how high temperature and pressure geologic fluids in the Earth's crust acquire their chemical compositions, specifically how they interact with Earth's lithosphere and biosphere. I work within the Department of Earth Science and the K.G. Jebsen Centre for Deep Sea Research (successor to the Centre for Geobiology), conducting research on topics that include:

● biogeochemical processes controlling the formation and evolution of seafloor hot spring fluids and their chemistry

● the chemistry of carbon compounds and carbon-sulfur interactions in hydrothermal settings and petroleum systems

● exploration and sampling of new hydrothermal systems in the deep ocean

● the organic geochemistry and biogeochemistry of hydrothermal chimney structures

● laboratory simulations (experiments) of hydrothermal fluids to develop and test hypotheses for natural systems

● developing techniques for novel dissolved organic analytes to expand our understanding of hydrothermal organic chemistry


Short Bio...

As the Associate Professor in Aqueous Geochemistry, I'm a permanent faculty member here at the Department of Earth Science, University of Bergen since 2015, and also a long-term Guest Investigator at the Department of Marine Chemistry and Geochemistry at the Woods Hole Oceanographic Institution (WHOI). From 2013-2015, I was a Postdoctoral Associate in the Earth, Atmospheric and Planetary Sciences (EAPS) Department at MIT, in the lab group of Prof. Shuhei Ono. Prior to that, I was a Postdoctoral Fellow at the MARUM Center for Marine Environmental Sciences (University of Bremen, 2010-2013) and an MIT/WHOI Joint Program graduate student at WHOI (Ph.D. 2010). 


Links to expeditions I've sailed on:

2019 HACON ◆ R/V Kronprins Haakon/ROV Neried Under Ice ◆ AMOR: Aurora Vent Site

2019 GS19 ◆ R/V GO Sars/ROV Ægir ◆ AMOR: 73°N Vent Site, Loki's Castle

2019 AT42-09 ◆ R/V Atlantis/HOV Alvin ◆ East Pacific Rise, Hot2Cold Vents (Meltzer-funded)

2018 GS18 ◆ R/V GO Sars/ROV Ægir ◆ AMOR: Seven Sisters, Jan Mayen, Ægir, Loki's Castle

2017 GS17 ◆ R/V GO Sars/ROV Ægir ◆ AMOR: Loki's Castle

2016 GS16B ◆ R/V GO Sars/ROV Ægir ◆ Arctic Mid-Ocean Ridge (AMOR): Jan Mayen, Ægir

2016 M126 ◆ R/V Meteor/ROV Quest 4000m ◆ Mid-Atlantic Ridge, 12-15°N

2013 FK008 ◆ R/V Falkor/HROV Nereus ◆ Mid-Cayman Rise

2012 AT18-16 ◆ R/V Atlantis/ROV Jason II ◆ Mid-Cayman Rise

2011 SO-216 ◆ R/V Sonne/ROV Quest 4000m ◆ Manus Basin

2010 M82/3 ◆ R/V Meteor/ROV Quest 4000m ◆ Menez Gwen

2008 AT15-38 ◆ R/V Atlantis/HOV Alvin ◆ Guaymas/EPR (9-10°N)

2008 KNOX18RR ◆ R/V R. Revelle/ROV Jason II ◆ Mid-Atlantic Ridge

2006 MGLN06MV ◆ R/V Melville/ROV Jason II ◆ Manus Basin

2005 TUIM05MV ◆ R/V Melville/ROV Jason II ◆ Lau Basin

Fall Semester:

GEOV243 Environmental Geochemistry (course leader, lecturer)

Spring Semester:

GEOV244 Principles in Geobiology (lecturer)

BIO318 Current Geobiological Topics (guest expert)

GEOV109 Introduction to Geochemistry (course leader V2018)

Journal articles
  • Schouw, Anders; Vulcano, Francesca; Roalkvam, Irene; Hocking, William Peter; Reeves, Eoghan; Stokke, Runar; Bødtker, Gunhild; Steen, Ida Helene. 2018. Genome analysis of Vallitalea guaymasensis strain L81 isolated from a deep-sea hydrothermal vent system. Microorganisms. doi: 10.3390/microorganisms6030063
  • Wang, David T.; Reeves, Eoghan; McDermott, Jill M; Seewald, Jeffrey S; Ono, Shuhei. 2018. Clumped isotopologue constraints on the origin of methane at seafloor hot springs. Geochimica et Cosmochimica Acta. 223: 141-158. doi: 10.1016/j.gca.2017.11.030
  • Wilckens, Frederike K.; Reeves, Eoghan; Bach, Wolfgang; Meixner, Anette; Seewald, Jeffrey S.; Koschinsky, Andrea; Kasemann, Simone A. 2018. The influence of magmatic fluids and phase separation on B systematics in submarine hydrothermal vent fluids from back-arc basins. Geochimica et Cosmochimica Acta. 232: 140-162. doi: 10.1016/j.gca.2018.04.023
  • Meier, Dimitri; Bach, Wolfgang; Girguis, Peter; Gruber-Vodicka, Harald; Reeves, Eoghan; Richter, Michael; Vidoudez, Charles; Amann, Rudolf; Meyerdierks, Anke. 2016. Heterotrophic Proteobacteria in the vicinity of diffuse hydrothermal venting. Environmental Microbiology. 18: 4348-4368. doi: 10.1111/1462-2920.13304
  • Price, Roy; Breuer, Christian; Reeves, Eoghan; Bach, Wolfgang; Pichler, Thomas. 2016. Arsenic bioaccumulation and biotransformation in deep-sea hydrothermal vent organisms from the PACMANUS hydrothermal field, Manus Basin, PNG. Deep Sea Research Part I: Oceanographic Research Papers. 117: 95-106. doi: 10.1016/j.dsr.2016.08.012

More information in national current research information system (CRIStin)


[20] Wilckens, F., E.P. Reeves, W. Bach, J. Seewald, S.A. Kasemann (in revision) Application of B, Mg, Li and Sr isotopes in acid-sulfate vent fluids and volcanic rocks as tracers for fluid-rock interaction in back-arc hydrothermal systems. Geochemistry, Geophysics, Geosystems

[19] Seewald, J.S., E.P. Reeves, W. Bach, P.J. Saccocia, P.R. Craddock, E. Walsh, W.C. Shanks III, S.P. Sylva, T. Pichler, M. Rosner (2019) Geochemistry of Hot-Springs at the SuSu Knolls Hydrothermal Field, Eastern Manus Basin: Advanced Argillic Alteration and Vent Fluid Acidity. Geochimica et Cosmochimica Acta, 255, pp25-48. DOI: 10.1016/j.gca.2019.03.034

[18] Schouw, A., F. Vulcano, I. Roalkvam, W.P. Hocking, E. Reeves, R. Stokke, G. Bødtker, I.H. Steen (2018) Genome Analysis of Vallitalea guaymasensis Strain L81 Isolated from a Deep-Sea Hydrothermal Vent System. Microorganisms, 6(3), 63. DOI: 10.3390/microorganisms6030063

[17] Wilckens, F.K., E.P. Reeves, W. Bach, A. Meixner, J.S. Seewald, A. Koschinsky, S.A. Kasemann (2018) The influence of magmatic fluids and phase separation on B systematics in submarine hydrothermal vent fluids from back-arc basins. Geochimica et Cosmochimica Acta, 232, pp140–162. DOI: 10.1016/j.gca.2018.04.023

[16] Wang, D.T., E.P. Reeves, J.M. McDermott, J.S. Seewald, and S. Ono (2018) Clumped isotopologue constraints on the origin of methane at seafloor hot springs. Geochimica et Cosmochimica Acta, 223, pp141–158. DOI: 10.1016/j.gca.2017.11.030

[15] Bach, W., E.P. Reeves (2016) Hydrothermal Vents. In: W.M. White (Ed.), Encyclopedia of Geochemistry: A Comprehensive Reference Source on the Chemistry of the Earth. Springer International. DOI: 10.1007/978-3-319-39193-9_110-1

[14] Price, R., C. Breuer, E.P. Reeves, W. Bach, T. Pichler (2016) Arsenic bioaccumulation and biotransformation in deep-sea hydrothermal vent organisms from the PACMANUS hydrothermal field, Manus Basin, PNG (cover article). Deep-Sea Research I: Oceanographic Research Papers, 117, pp95-106. DOI: 10.1016/j.dsr.2016.08.012

[13] Meier, D., W. Bach, P.R. Girguis, H. Gruber-Vodicka, E.P. Reeves, M. Richter, C. Vidoudez, R. Amann, A. Meyerdierks (2016) Heterotrophic Proteobacteria in the vicinity of diffuse hydrothermal venting. Environmental Microbiology, 18, pp4348-4368. DOI: 10.1111/1462-2920.13304

[12] Seewald, J.S., E.P. Reeves, W. Bach, P. Saccocia, P. Craddock, W.C. Shanks III, S. Sylva, T. Pichler,  M. Rosner, E. Walsh (2015) Submarine venting of magmatic volatiles in the Eastern Manus Basin, Papua New Guinea, Geochimica et Cosmochimica Acta, 163, pp178–199. DOI: 10.1016/j.gca.2015.04.023

[11] Wang, D.T., D.S. Gruen, B. Sherwood Lollar, K.-U. Hinrichs, L.C. Stewart, J.F. Holden, A.N. Hristov, J.W. Pohlman, P.L. Morrill, M. Könneke, K.B. Delwiche, E.P. Reeves, C.N. Sutcliffe, D.J. Ritter, J.S. Seewald, J.C. McIntosh, H.F. Hemond, M.D. Kubo, D. Cardace, T.M. Hoehler, S. Ono (2015) Nonequilibrium clumped isotope signals in microbial methane. Science, 348(6233), pp428-431. DOI: 10.1126/science.aaa4326 (See Perspective by Passey)

[10] Reeves, E.P.‡, M. Yoshinaga‡, P. Pjevac‡, N. Goldenstein, J. Peplies, A. Meierdierks, R. Amann, W. Bach, K.-U. Hinrichs (2014) Microbial lipids reveal diverse carbon flow patterns on hydrothermal sulfide structures. Environmental Microbiology, 16(11), pp3515-3532. DOI: 10.1111/1462-2920.12525 (‡equal contribution)

[9] Reeves, E.P., J.M. McDermott, J.S. Seewald (2014)  The origin of methanethiol in midocean ridge hydrothermal fluids. Proceedings of the National Academy of Sciences, 111(15), pp5474–5479. DOI: 10.1073/pnas.1400643111

[8] Lang, S.Q., G.L. Früh-Green, D.S. Kelley, M.D. Lilley, G. Proskurowski, E.P. Reeves (2012) Online Letter: H2/CH4 ratios cannot reliably distinguish abiotic vs. biotic methane in natural hydrothermal systems. Proceedings of the National Academy of Sciences, 109(47), E3210. DOI: 10.1073/pnas.121313810

[7] Pester, N.J., E.P. Reeves, M.E. Rough, K. Ding, J.S. Seewald, W.E. Seyfried Jr. (2012) Subseafloor phase equilibria in high-temperature hydrothermal fluids of the Lucky Strike Seamount (Mid-Atlantic Ridge, 37°17'N). Geochimica et Cosmochimica Acta, 90, pp303–322. DOI: 10.1016/j.gca.2012.05.018

[6] Reeves, E.P., J.S. Seewald, S. Sylva (2012) Hydrogen isotope exchange between n-alkanes and water under hydrothermal conditions. Geochimica et Cosmochimica Acta, 77, pp582–599. DOI: 10.1016/j.gca.2011.10.008

[5] Reeves, E.P., J.S. Seewald, P. Saccocia, W. Bach, P.R. Craddock, W.C. Shanks, S.P. Sylva, E. Walsh, T. Pichler, M. Rosner (2011) Geochemistry of hydrothermal fluids from the PACMANUS, Northeast Pual and Vienna Woods hydrothermal fields, Manus Basin, Papua New Guinea. Geochimica et Cosmochimica Acta, 75, pp1088–1123. DOI: 10.1016/j.gca.2010.11.008

[4] Newton, R.J., E.P. Reeves, N. Kafousia, P.B. Wignall, S.H. Bottrell, J.G. Sha (2011) Low marine sulfate concentrations and the isolation of the European epicontinental sea during the Early Jurassic. Geology, 39, pp7–10. DOI: 10.1130/G31326.1

[3] Mottl, M.J., J.S. Seewald, C.G. Wheat, M.K. Tivey, P.J. Michael, G. Proskurowski, T.M. McCollom, E. Reeves, J. Sharkey, C.F. You, L.H. Chan, T. Pichler (2011) Chemistry of hot springs along the Eastern Lau Spreading Center. Geochimica et Cosmochimica Acta, 75, pp1013–1038. DOI: 10.1016/j.gca.2010.12.008

[2] Craddock, P.R., W. Bach, J.S. Seewald, O.J. Rouxel, E. Reeves, M.K. Tivey (2010) Rare earth element abundances in hydrothermal fluids from the Manus Basin, Papua New Guinea: Indicators of sub-seafloor hydrothermal processes in back-arc basins. Geochimica et Cosmochimica Acta, 74, pp5494–5513. DOI: 10.1016/j.gca.2010.07.003

[1] Wignall, P.B., A. Hallam, R.J. Newton, J.G. Sha, E. Reeves, E. Mattioli, S. Crowley (2006) An eastern Tethyan (Tibetan) record of the Early Jurassic (Toarcian) mass extinction event. Geobiology, 4, pp179–190. DOI: 10.1111/j.1472-4669.2006.00081.x

Please contact me about research opportunities (Erasmus+, M.Sc./Ph.D. or postdoctoral) in my group!


  • Thomas Ø. Viflot (Ph.D., 2019-2023): Experimental investigations of diverse organic production pathways in hydrothermal systems (NFR FRINATEK HyPOD)
  • Chanakan Boonnawa (M.Sc.-Ph.D., 2019-2024): Geochemistry of novel hydrothermal fluids from the 73°N (Fåvne) site on the Arctic Mid-Ocean Ridge (graduate fellowship)

Co-supervised students:

  • Francesca Vulcano (Ph.D. UiB, 2018-2022): Anaerobic alkane oxidation at the Loki's Castle Barite Field: microbial physiology at the foundation of hydrocarbon cycling (with Ida H. Steen)
  • Eva-Maria Meckel (M.Sc., Uni. Oldenburg)
  • Johannes Scheffler (M.Sc., Uni. Leipzig)
  • Rasmus Rikter-Svendsen (M.Sc. UiB, 2019-2021): Distribution of thermochemical output and associated ecosystems at the Loki's Castle Hydrothermal Field (with Thibaut Barreyre)
  • Ingvild Aarrestad (M.Sc. UiB, 2018-2020): Tracing contamination from historical mining sites in Norway with Cu isotopes (with Desiree Roerdink)



My group and I currently operate a wide array of organic and inorganic analytical instruments (packed and capillary column gas chromatography/mass spectrometry, ion-selective electrodes) in the UiB Biogeochemistry Laboratory, in addition to analytical and precision balances (Mettler Toledo). I am also constructing the lab's new flexible-cell high temperature-pressure reactors for hydrothermal experiments. Please email me for further information about analyses, experimentation and collaboration.

Purge-and-trap gas chromatography/mass spectrometry (P&T-GC/MS-FID):

Installed 2017, a GC/FID-MS (Agilent 7890B GC-FID / 5977B Series MSD) with 7693A Automatic Liquid Sampler (solvent-based samples), Cool On-Column (COC) and Multimode (MMI) Inlets, with connection to a Teledyne Tekmar Lumin Purge-and-Trap Concentrator and AQUATek 100 Autosampler (Volatile Organic Analysis, VOA).

Purge-and-trap gas chromatography with S-specific detection (P&T-GC-TCD-FID-SCD):

Installed 2017, an Agilent 7890A GC with a TCD-FID and tandem Agilent 8355 Sulfur Chemiluminescence Detector


Research groups