Lukas Klose (PhD Student until 2023)

Research project: Transport and fractionation of hydrothermally derived metals from different hydrothermal vent systems

My PhD Project is part of the TONGARIFT Project funded by the BMBF. During the RV Sonne cruise SO263 in June 2018, hydrothermal fluids in the NE Lau Back-arc and NE Tonga Arc were sampled. In addition to endmember fluids, diluted hydrothermal plumes in the water column were sampled and identified.

Hydrothermal fluids from back-arc / island-arc systems are different to those from mid-ocean ridges, due to shallower water depth, variable source rocks and the input of magmatic volatiles. This influences the geochemical composition of hydrothermal fluids and precipitates. Studying the extent and chemical composition of the related plumes enables us to provide new information on the importance of back-arc / island-arc systems on element-fluxes into the ocean.

Therefore, the focus of my work will be on the characterization of the different hydrothermal vent systems, as well as on the transport and fractionation of hydrothermally derived metals from these systems. Additionally, the data will be compared to fluids from the Kermadec arc (RV Sonne, SO253, Dec. 2016 / Jan. 2017), which is adjacent to the south of the Tonga ridge. Furthermore, hydrothermal fluids from the Mid-Atlantic ridge will be sampled (RV Meteor, scheduled for 2021).

Ongoing projects:

2018 – 2020     TONGARIFT (BMBF)

RV SONNE (SO 263) reserach cruise to the Tonga Island Arc, SW Pacific, June 2018; (Chief scientist K. Haase, Univ. Erlangen; co-PIs: W. Bach, Univ. Bremen, and A. Koschinsky, Jacobs University Bremen)

Blog from the cruise:

2016 – 2019     HYDROTHERMADEC (BMBF)

RV SONNE  (SO 253) research cruise to the Kermadec Island Arc, SW Pacific, Dec. 2016 – Jan. 2017; (Chief Scientist: A. Koschinsky, Jacobs University Bremen)

Blog and video from the cruise:


  • Klose, L., Keith, M., Hafermaas, D., Kleint, C., Bach, W., Diehl, A., Wilckens, F., Peters, C., Strauss, H., Klemd, R., Haase, K. and Koschinksy, A. (under review): Trace element and isotope systematics in vent fluids and sulphides from Maka volcano, North Eastern Lau Spreading Centre: Insights into three-component fluid mixing. Frontiers in Earth Science.

Related work group publications:

  • Kleint, C., Bach, W., Diehl, A., Fröhberg, N., Garbe-Schönberg, D., Hartmann, J.F., de Ronde, C.E.J., Sander, S.G., Strauss, H., Stucker, V., Thal, J., Zitoun, R. and Koschinsky, A. (2019): Geochemical characterization of highly diverse hydrothermal fluids from volcanic vent systems of the Kermadec intraoceanic arc, Chemical Geology. doi: 10.1016/j.chemgeo.2019.119289
  • Schmidt, K., Garbe-Schönberg, D., Hannington, M.D., Anderson, M.O., Bühring, B., Haase, K., Haruel, C., Lupton, J., and Koschinsky, A. (2017): Boiling vapour-type fluids from the Nifonea vent field (New Hebrides Back- Arc, Vanuatu, SW Pacific): Geochemistry of an early-stage, post-eruptive hydrothermal system. Geochimica et Cosmochimica Acta 207, 185-209. doi: 10.1016/j.gca.2017.03.016

Conference presentations:

  • Klose, L., Kleint, C., Bach, W., Peters, C., Strauss, H. and Koschinsky, A. (Poster): Geochemical variability of hydrothermal fluids from four vent sites in the North East Lau Basin; Goldschmidt 2019, Barcelona, Spain.