Halite fluid-inclusion research extends beyond younger Phanerozoic intervals; Neoproterozoic and Early Cambrian evaporites have also been used to investigate very ancient seawater chemistry.
For related guides and articles, see the Rock Salt Chemistry section.
Pakistan and Australia
A Neoproterozoic study compared halite fluid inclusions from Pakistan’s Salt Range and Australia’s Amadeus Basin.
The paper discusses long-term shifts between calcium-rich and sulfate-rich seawater states.
Early Cambrian Siberia
Analyses of Angara Formation halites in eastern Siberia supported a high-calcium, low-sulfate Early Cambrian ocean.
The record indicates that major-ion chemistry around 515 million years ago differed from that of the modern ocean.
Long-Term Ocean Cycles
These studies support a model of oscillatory rather than one-directional changes in seawater composition over hundreds of millions of years.
Such shifts have been discussed alongside seafloor-spreading rates, sea level and carbonate/evaporite mineralogy.
Related article: Why Was Cretaceous Seawater Different?.
Sources
- Precambrian Research – Neoproterozoic seawater from halite fluid inclusions
- Chemical Geology – Early Cambrian seawater chemistry from Siberian halite
Rock Salt Brands and Supply Channels
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