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

My research is dedicated to understanding how high temperature and pressure geologic fluids in the earth's crust acquire their chemical compositions, specifically their interactions with the 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) to conduct research on topics such as:

● geochemical 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 diverse hydrothermal systems in the deep ocean

● the organic geochemistry/biogeochemistry of hydrothermal fluids and structures

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

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


Welcome, visitors! A 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, and also a 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:

2017 GS17/KGJ-CDEEPSEA - R/V G.O. Sars/ROV Ægir 6000 - Arctic Mid-Ocean Ridge

2016 GS16B/CGB-CDEEP - R/V G.O. Sars/ROV Ægir 6000 - Arctic Mid-Ocean Ridge

2016 M126 - R/V Meteor/ROV Quest 4000m - Mid-Atlantic Ridge

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/DSV 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 Aquatic Geochemistry (course leader, lecturer)

Spring Semester:

GEOV244 Principles in Geobiology (lecturer)

BIO318 Current Geobiological Topics (guest expert)

GEOV109 Introduction to Geochemistry (course leader)

Journal articles
  • Reeves, Eoghan. 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)

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

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

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

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

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

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

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)

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)

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

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

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

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

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

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

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

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

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


M.Sc. - Thomas Viflot (2017-2019) Project Synopsis

Please contact me about opportunities (M.Sc./Ph.D. or postdoctoral) in my lab.



I operate a number of organic and inorganic analytical instruments (gas chromatographs, ion-selective electrodes) in the UiB Biogeochemistry Laboratory, in addition to analytical and precision balances (Mettler Toledo), and the lab's new flexible-cell reactors for hydrothermal experiments. Please email me for further information about analyses and collaboration.

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

Installed Spring 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):

Also installed Spring 2017, an Agilent 7890A with a TCD-FID and tandem Agilent 8355 Sulfur Chemiluminescence Detector


2018-2021 Project HACON, Research Council of Norway, Researcher Project - FRINATEK (Partner):

Hot vents in an ice-covered ocean: the role of the Arctic as a connectivity pathway between ocean basins


2017-2021 K.G. Jebsen Centre for Deep-Sea Research (Work Package Leader):

WP2 - Diversity and Functioning of Hydrothermal Systems

WP4 - Hydrothermal Reactions: Experimental analogs for the Deep Sea


Research groups