Very thick rock-salt successions are generally difficult to explain by simply drying out one isolated body of seawater once. Classic USGS work emphasises repeated seawater inflow into a restricted basin combined with intense evaporation.
More information on this topic is available in the Scientific Salt Research section.
Why One Drying Event Is Not Enough
USGS discussions note that unrealistic water depths would be required to generate some very thick gypsum and halite deposits from one initial water body.
Repeated replenishment models are therefore more plausible.
Restricted Connection
A barrier, sill or narrow connection can partly isolate a basin while still allowing seawater to enter.
Evaporation removes water while dissolved salts accumulate in the basin.
Balance
Permanent salt accumulation requires deposition to exceed dissolution during wetter periods or later inflow.
USGS studies of modern Mexican salt environments explicitly emphasise this seasonal balance.
Sources
- USGS – Origin of halite rock and gypsum rock
- USGS – Origin and chemical composition of evaporite deposits
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