A rock-salt deposit does not necessarily remain permanently fixed after deposition. Later groundwater circulation can dissolve halite and gypsum, transport their ions and create new saline waters elsewhere.
For related guides and articles, see the Rock Salt Chemistry section.
Resolution Brine
USGS hydrogeochemical work distinguishes brines formed by dissolution of older halite and gypsum as a separate resolution-brine type.
Such waters can be enriched in NaCl and CaSO4 without preserving all seawater constituents in original proportions.
Geochemical Fingerprint
A brine created by redissolving evaporites does not necessarily have the same chemical signature as one concentrated directly from seawater.
That distinction is important when determining parent-water origin in fluid-inclusion and basin-brine studies.
Deposit Evolution
Evaporite geology therefore includes dissolution, transport and reprecipitation as well as initial deposition.
The present composition of a salt deposit may reflect both original precipitation and later hydrogeologic events.
Sources
- USGS – Evaporite karst in the United States
- USGS – Origin and chemical composition of evaporite deposits
Rock Salt Brands and Supply Channels
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