Dolomitization by near-normal seawater? Field evidence from the Bahamas

Indicates active circulation of groundwaters of near-normal seawater composition through the Great Bahama Bank beneath Andros Island. Waters of slightly elevated salinity derived from the bank surface flow eastwards beneath the island, and then mix with cold normal-salinity seawaters from the adjacent oceans. Saline groundwaters are significantly depleted in magnesium compared to Great Bahama Bank and open ocean seawaters. In the absence of major calcium depletion, this provides direct evidence for present-day replacement dolomitization. -from Authors