Articles | Volume 25, issue 7
Hydrol. Earth Syst. Sci., 25, 3837–3853, 2021
https://doi.org/10.5194/hess-25-3837-2021
Hydrol. Earth Syst. Sci., 25, 3837–3853, 2021
https://doi.org/10.5194/hess-25-3837-2021

Research article 02 Jul 2021

Research article | 02 Jul 2021

The evolution of stable silicon isotopes in a coastal carbonate aquifer on Rottnest Island, Western Australia

Ashley N. Martin et al.

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Latest update: 16 Sep 2021
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Short summary
We measured the silicon isotopic composition of groundwater from Rottnest Island, Western Australia, to investigate water–rock interactions in a coastal aquifer. Silicon isotopic ratios varied spatially across the island and were related to secondary mineral formation and vertical mixing within the aquifer. We find that silicate dissolution occurs in the freshwater–seawater transition zone, supporting the recent recognition of submarine groundwater discharge in the oceanic silicon isotope cycle.