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The purpose of the present work was to study the distribution of bromine, chloride/bromide ratios, and iodine in interstitial waters of three holes in the Black Sea. The holes were drilled in the course of Leg 42B by D/V Glomar Challenger in May 1975. Owing to their similar ionic radius, chloride and bromide ions resemble each other in chemical and geochemical behavior, occurrence, and migration patterns in the earth's crust. The larger ionic radius of iodine influences its pattern of dissemination and results in low Clarke values. Owing to their solubility, chloride and bromide are largely found in solution, principally in the sea and saline lakes. Separation of chloride and bromide is achieved as a result of the greater solubility of bromide than chloride during the evaporation of seawater to the point of precipitation of NaCl. Bromide remains in solution, being precipitated only at the very last stages of crystallization. The precipitate of NaCl contains only traces of Br, whereas the residual liquid is enriched in bromide. Consequently, the Cl/Br ratio diverges from its normal level of about 300 chiefly in two special cases: (1) as a result of volatilization of NaCl, as occurs in meteorites, or leaching of salts having a Cl/Br ratio greater than 300; (2) in waters mixed with residual brines rich in bromide with a Cl/Br ratio less than 300. Lesser separation occurs as a result of the differential sorptive properties, and the greater concentration of bromine in living matter. These processes lead to greater concentrations of bromine in soils, peat, clays enriched with organic matter, and interstitial waters.

Distribution of Bromine, Cl/Br Relationships and Iodine in Interstitial Water of the Black Sea, Based on DSDP Leg 42B