As halite grows, it can trap microscopic droplets of the surrounding concentrated brine inside the crystal. If primary fluid inclusions are preserved, they can retain chemically informative samples derived from ancient seawater for hundreds of millions of years.
For related guides and articles, see the Rock Salt Chemistry section.
A Direct Geological Sample
A fluid inclusion does not merely infer environmental chemistry indirectly; it physically traps a tiny portion of the brine present during crystal growth.
That makes halite a particularly powerful paleochemical archive compared with many proxy records.
Validated in Modern Environments
The 2001 Great Inagua and Baja California study showed that modern marine halite inclusions track the major-ion chemistry of evaporating seawater.
The contrasting nonmarine signature of Qaidam Basin samples supported the ability to distinguish different parent waters.
Hundreds of Millions of Years
Silurian, Permian and Cretaceous studies showed that ocean major-ion chemistry changed through geologic time.
The 2023 study extended the archive to strontium variation over roughly 550 million years using 1,371 inclusions from 131 halite samples.
Limits of the Archive
Not every halite sample provides a reliable paleoseawater record; primary inclusions must be preserved, marine origin established and later recrystallisation or recycling excluded.
Halite is therefore a powerful archive, but one that requires careful petrographic and geochemical validation.
Sources
- Geochimica et Cosmochimica Acta 2001 – Evaluating seawater chemistry from fluid inclusions in halite
- Geochimica et Cosmochimica Acta 2002 – The major-ion composition of Silurian seawater
- Geochimica et Cosmochimica Acta 2005 – The major-ion composition of Permian seawater
- Geochimica et Cosmochimica Acta 2006 – Cretaceous seawater major-ion chemistry
- Geochimica et Cosmochimica Acta 2023 – Plate tectonic control of strontium concentration in seawater
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