Replication Data for: Halogen and Cl isotopic systematics in Martian phosphates: Implications for the Cl cycle and surface halogen reservoirs on Mars.

• In situ investigation of the Cl and halogen concentrations in Martian meteorites. • Cl compositions in Martian meteorites controlled by interactions with the surface halogens and perchlorate. • Evidence for early and widespread interaction between Martian meteorites, Martian hydrosphere, and Martian atmosphere. • Similar bulk initial Cl isotope composition between the Earth, Moon, and Mars.