The study comprises an investigation of the Shackleton Range (which is a part of the East Antarctic craton) by two geologists affiliated with the Russian Academy of Sciences in St. Petersburg. It is focused on thermodynamic conditions of metamorphism and includes an analysis of fluid characteristics based on the cryometric method. The detected presence of slightly mineralized salt‐water inclusions in quartz provided new evidence suggesting a crustal nature of the fluid and an isochemical nature of the metamorphism.