Abiologic silicon isotope fractionation between aqueous Si and Fe(III)–Si gel in simulated Archean seawater: Implications for Si isotope records in Precambrian sedimentary rocks

Summary

This laboratory study examined abiological silicon isotope fractionation between dissolved silica and iron(III)–silicate gel phases under conditions simulating Archean seawater. By quantifying isotope fractionation factors at different temperatures and pH values, the authors provide a baseline for interpreting silicon isotope records preserved in Precambrian sedimentary rocks, which may help distinguish between abiological and biological processes in ancient biogeochemical cycles.

UK applicability

This is fundamental geochemistry research with limited direct application to UK farming systems or soil health. However, improved understanding of silicon isotope geochemistry could inform interpretation of silicon dynamics in modern soils and sediments studied within UK environmental science.

Key measures

Silicon isotope fractionation factors (Δ30Si); isotopic composition of aqueous Si and Fe(III)–Si gel phases under varying pH, temperature, and chemical conditions simulating early Earth seawater

Outcomes reported

The study experimentally determined silicon isotope fractionation factors between dissolved silica and Fe(III)–Si gel precipitates under simulated Archean seawater conditions. The findings provide a geochemical framework for interpreting silicon isotope signatures preserved in Precambrian sedimentary rocks.

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