Skip to main content
VandeVelde Sebastiaan

Dr. Sebastiaan Van de Velde

BAEF fellow Univ. California at Riverside; PhD 2018, Former teammembers

Biography

PROJECT TITLE:

Impact of electrogenic sulfur oxidation on trace metal cycling in coastal sediments.

PROJECT SUMMARY:

Cable bacteria perform electrogenic sulphur oxidation, whereby electrical currents over centimeter-scale distances couple the reduction of oxygen at the sediment-water interface to the oxidation of sulphur in the deeper sediment. This generates strong pH gradients in the pore water, which affects acid-sensitive minerals like iron sulphides and calcium carbonates. Cable bacteria are being discovered globally, but it is still largely unknown how this process affects sedimentary geochemistry. My project focusses on the geochemical implications for iron, sulphur and trace metal cycling in marine sediments.

FIELD SITES:

Belgian Coastal Zone (North Sea, Belgium), Lake Grevelingen (North Sea, The Netherlands), East Gotland Basin (Baltic Sea, Sweden), Blakeney salt marshes (North Sea, United Kingdom)

KEYWORDS:

early diagenesis, biogeochemical cycling, iron, sulphur, trace metals

SUPERVISORS:

Prof. Filip Meysman

Prof. Yue Gao

 

Location

University of California