Carbone dioxide fluid in corundum using FTIR

Abstract

Fluid inclusions of carbon dioxide are well known as typical naturally occurring inclusions in corundum. (Koivula 1980). Until recently, they are also considered evidence of absence of thermal treatment, but carbon dioxide fluids have been reported even after heating with pressure (Nattida Ng-Pooresatien 2020) and they are no longer absolute evidence of absence of thermal treatment. Previous reports of carbon dioxide fluid have been determined by observation under a microscope, but in this presentation we report that infrared absorption can be used to confirm the presence of carbon dioxide fluids in corundum.