Tim K. Lowenstein is a leading researcher in reconstructing ancient seawater chemistry from microscopic fluid inclusions trapped in halite crystals.
For related guides and articles, see the Rock Salt Chemistry section.
Research Program
Lowenstein and colleagues have analysed fluid inclusions in modern, Silurian, Permian, Cretaceous and older halites to reconstruct how seawater composition changed through geologic time.
This research treats halite not merely as an evaporite mineral but as a geological archive capable of preserving direct samples of ancient brines.
Validation with Modern Settings
A 2001 study showed that fluid inclusions in modern marine halites from Great Inagua, Bahamas, and Baja California faithfully record the chemical path of evaporating seawater.
Nonmarine examples such as the Qaidam Basin produced a distinct chemical signature.
Geologic Timescale
Later studies reconstructed major-ion chemistry in Silurian, Permian and Cretaceous seawater and, in 2023, examined strontium variation over roughly 550 million years.
Together these studies show that seawater chemistry has not remained constant through geologic time.
Related article: How Are Halite Fluid Inclusions Calibrated in the Laboratory?.
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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