Resolving Cl and SO4 Profiles in a Clay-Rich Rock Sequence

Wersin, Paul; Waber, H. Niklaus; Mazurek, Martin; Mäder, Urs K.; Gimmi, Thomas; Rufer, Daniel; Traber, Daniel (2013). Resolving Cl and SO4 Profiles in a Clay-Rich Rock Sequence. Procedia earth and planetary science, 7, pp. 892-895. Elsevier 10.1016/j.proeps.2013.03.197

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The chloride and sulfate concentration profiles in a 260 m thick clay-rich Mesozoic sediment sequence have been analyzed by various methods. Chloride data generally indicate a good consistency between different methods if anion exclusion is accounted for in leaching tests. For sulfate, however, there is an apparent inconsistency between leaching data and those obtained from the other methods, which points to the dissolution of a sulfur-bearing mineral. Traces of diagenetic gypsum seem to be a likely source, but other sulfur minerals cannot be ruled out.

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