Research Division 2: Marine Biogeochemistry
Research Unit: Marine Geosystems

Room: 8D-136
Phone: +49 431 600-2155
Email: sgeilert(at)

Wischhofstraße 1-3
D-24148 Kiel


  • Enhanced benthic weathering of carbonate and olivine in the Baltic Sea (PI; project in RETAKE: Carbon Dioxide Removal by Alkalinity Enhancement: Potential, Benefits and Risks). Funded by BMBF, 2021-2023
  • Silica-carbon coupling and the impact on global climate (PI). Funded by GEOMAR Postdoc Projects, 2021-2022
  • IODP expediion 366: Mariana Convergent Margin and South Chamorrow Seamount (shore based scientist)

Research interests

  • Marine silicate weathering and coupling of the silica-carbon cycle
  • Non-traditional stable isotopes to trace geochemical cycles
  • Enhanced weathering to mitigate global change



  • Geilert, S., Albers, E., Frick, D., Hansen, C., von Blanckenburg, F., 2021: Systematic changes in serpentine Si isotope signatures across the Mariana forearc - a new proxy for slab dehydration processes. EPSL 575,117193.
  • Grasse, P., Haynert K., Doering K., Geilert, S., Jones, J.L., Brzezinski, M.A., Frank, M., 2021. Controls on the Silicon Isotope Composition of Diatoms in the Peruvian Upwelling. Frontiers in Marine Science 8, 697400
  • Wang, W., Geilert, S., Wei H.-Z., Jiang S.-Y., 2021,Competition of equilibrium and kinetic silicon isotope fractionation during silica precipitation from acidic to alkaline pH solutions in geothermal systems. GCA 306, 44-62.
  • Lagostina, L., Frandsen, S., MacGregor, B.J., Glombitza, C., Deng, L., Fiskal, A., Li, J., Doll, M., Geilert, S., Schmidt, M., Scholz, F., Jorgenson , B.B., Hensen, C., Bernasconi, S.M.,Teske, A., Lever, M.A., 2021: Interactions of temperature and energy supply as drivers of microbial communities in hydrothermal sediment. Communications Biology 4, 1006.
  • Dale, A.W., Paul, M., Clemens, D., Scholz, F., Schroller-Lomnitz, U.,  Wallmann, K., Geilert, S., Hensen, C., Plass, A., Liebetrau, V., Grasse, P., Sommer, S., 2021: Recycling and burial of biogenic silica in an open margin oxygen minimum zone. Global Biogeochemical Cycles, 35.
  • Geilert, S., Grasse, P., Wallmann, K., Liebetrau, V., Menzies, C.D., 2020: Serpentine alteration as source of high dissolved silicon and elevated δ30Si values to the marine Si cycle. Nature Communications, 11, 5123.
  • Grasse, P., Closset, I., Jones, J.L., Geilert, S., Brzezinski, M.A., 2020: Controls on Dissolved Silicon Isotopes Along the U.S. GEOTRACES Eastern Pacific Zonal Transect (GP16). Global Biogeochemical Cycles, 34.
  • Geilert, S., Hensen, C., Wallmann, K., Schmidt, M., Liebetrau, V., Scholz, Doering, K., Grasse, P., Ehlert, C., Frank, M., 2020: Impact of ambient conditions on the Si isotope fractionation in marine pore fluids during early diagenesis. Biogeosciences, 17,1745-1763.
  • Geilert, S., Hensen, C., Schmidt, M., Liebetrau, V., Scholz, F., Doll, M., Deng, L., Fiskal, A., Lever, M. A., Su, C.-C., Schlomer, S., Sarkar, S., Thiel, V., Berndt, C., 2018: On the formation of hydrothermal vents and cold seeps in the Guaymas Basin, Gulf of California. Biogeosciences, 15, 5717-5731.
  • Ehlert, C., Doering, K., Wallmann, K., Scholz, F., Sommer, S., Grasse, P., Geilert, S., Frank, M., 2016: Stable silicon isotopes in marine pore waters - dissolution versus authigenic clay mineral formation processes.GCA, 440, 207-218
  • Geilert, S., van Bergen, M., Vroon, P., Keller, N., Stefansson, A., 2015.: Silicon isotope fractionation during silica precipitation from hot spring waters: evidence from the Geysir geothermal field, Iceland. GCA, 164, 403-427
  • Geilert, S., van Bergen, M., Vroon, P., Van Cappellen, P., 2014: Silicon isotope fractionation during abiotic silica precipitation at low temperatures: inferences from flow-through experiments. GCA, 142, 95-114