Abstract
The ratios Cl/Br, Na/Br, K/Br of fluid hypersaline inclusions of quartz situated in the Bramans-Termignon evaporites have been measured by means of neutronic activation. The results obtained: Cl/Br (90–1000), Na/Br (100–500) and K/Br (8–50) indicate that those fluids are natural samplings of very ancient marine evaporitic brines whose geochemical evolution is derived from regional “tectonometamorphic” processes. These results are discussed by comparison of a simple mixture model between Br-rich brines with an evaporitic origin and Br-poor ones coming from the re-dissolution of halide formerly present in the sediments. The evolution of the chemical composition of the solutions corresponds both on the NaCl dissolution and on the neo-formation of some minerals, such as albite.
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