Excited to find out that our recent paper entitled The evolution of stable silicon isotopes in a coastal carbonate aquifer on Rottnest Island, Western Australia was published in Hydrology and Earth System Sciences. This was a collaboration between UNSW Sydney and ANSTO in Australia.
The link to the freely available (open access) paper is here: https://hess.copernicus.org/articles/25/3837/2021/
Selected photographs from a field trip to Rottnest Island in 2017 shown below
Outcrop of Tamala Limestone at Salmon Bay (Credit: Andy Baker) 
Borehole sampling above the freshwater lens (Credit: Andy Baker) 
Sampling seawater from the one of the many beautiful bays on Rottnest Island
Trials & Errors 