Archive for March 2023

Two studies published by Jule Middleton documenting the rates, sensitivities, and barium-isotopic consequences of ion exchange in barite. The first paper investigated how fast and how much ion exchange affected the isotope composition of barium in barite–fluid systems. We did this by performing laboratory experiments under marine-relevant conditions. The main findings are that ion exchange…

A new study published by Chad Ostrander in Geochimica et Cosmochimica Acta examining thallium cycling in Siders Pond, a salt-stratified, low-oxygen, sulfide-rich body of water right here in Falmouth! The thallium isotope composition of marine sediments is a valuable tool for studying historical oxygen dynamics on Earth. This proxy relies on the sensitivity of thallium…