Articles | Volume 22, issue 14
https://doi.org/10.5194/bg-22-3533-2025
https://doi.org/10.5194/bg-22-3533-2025
Research article
 | 
23 Jul 2025
Research article |  | 23 Jul 2025

Faithful transfer of radiolarian silicon isotope signatures from water column to sediments in the South China Sea

Qiang Zhang, George E. A. Swann, Vanessa Pashley, and Matthew S. A. Horstwood

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We present the first coupled record of radiolarian silicon isotopes (δ30Sirad) from paired water column and surface sediment samples, along with the fractionation factor for δ30Sirad in the South China Sea. No significant discrepancies in δ30Sirad values were observed between plankton and sediment samples, implying minimal dissolution impact on δ30Sirad during sinking. This indicates faithful preservation of the δ30Sirad signature and its potential for studying past marine silicon cycle changes.
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