A 2023 study expanded the halite fluid-inclusion archive from individual geologic intervals into a roughly 550-million-year reconstruction of seawater strontium.
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131 Halite Samples
Researchers chemically analysed 1,371 fluid inclusions in 131 halite samples that had marine 87Sr/86Sr values.
The dataset covered Phanerozoic and Neoproterozoic seawater.
Seven-Fold Variation
The paper reported roughly seven-fold variation in seawater strontium concentration over about 550 million years.
Strontium oscillated twice between high and low concentrations.
Plate-Tectonic Link
The authors linked these strontium changes with intervals of calcium-rich, sulfate-poor paleoseawater and calcite–aragonite sea cycles.
The study interprets the long-term pattern within a plate-tectonic control framework.
Related article: Why Is Halite a Chemical Archive of Ancient Oceans?.
Sources
- Geochimica et Cosmochimica Acta 2023 – Plate tectonic control of strontium concentration in seawater
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