Abstract

From Br-/Cl- ratios coupled with stable-isotope compositions, the components of deep sedimentary brines—namely, primary and secondary brines (from dissolving evaporites) and diluting waters of meteoric origin—can be identified, and in favorable cases, their respective proportions can be quantified. Dilution of primary marine brines (mother liquors of halite) by meteoric waters has occurred in the Dogger and the Keuper aquifers. The presence of highly saline brines (molality of Cl- = 3.9) in the Rhaetian aquifer may be due to dissolution of primary marine halite by sea water with minor contributions of primary brines. The resulting mixture is diluted by meteoric ciriculation.

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