Modern seawater has a uniform δ37Cl value (0.0‰), with an exception in the upper current
of the Bosphorus (0.4‰). Marine halite ranging in age from Cambrian to Miocene has δ37Cl
values of 0.0±0.9‰, with most of the data in the range 0.0±0.5‰. Mean δ37Cl values differ
measurably between basins, with no evident relationship to basin size or to age. Smaller
evaporite bodies have the largest δ37Cl ranges. Potash facies halite has mean δ37Cl
values lower than those of halite facies salt in the East Siberia and Zechstein basins. The …