Abstract

Folds and disturbed bedding are common features in Cretaceous salt deposits of Sergipe, Brazil, and appear to be of syn-sedimentary origin rather than due to tectonic or isostatic forces acting long after lithification and burial. Thick deposits of tachyhydrite, within the evaporite sequence, could only have been preserved in a basin which had a continuous covering of brine and which never reached the dry-lake stage. In such an environment, lack of early cementation may have provided conditions favourable for the formation of syn-sedimentary structures by slumping, compaction and loading. Salt domes are not associated with the Sergipe deposits but unlitlified salt sediments have a low effective density and lack of strength which will facilitate salt flowage and dome formation with a minimum overburden.

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