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Published on: August 2, 2021
Sedimentary phosphate method for estimating paleosalinities.
Science (New York, N.Y.)
|November 17, 1967
Summary
A new paleosalinity estimation method uses sedimentary phosphate found in clay-rich sediments. The iron and calcium phosphate ratios in sediments directly indicate past water salinity levels.
Area of Science:
- Geochemistry
- Sedimentology
- Paleoceanography
Background:
- Sedimentary phosphate is common in argillaceous sediments.
- Understanding past salinity is crucial for reconstructing environmental conditions.
Purpose of the Study:
- To introduce a novel method for paleosalinity estimation.
- To utilize the geochemical properties of sedimentary phosphate.
Main Methods:
- Analyzing the iron- and calcium-phosphate fractions within sedimentary phosphate.
- Correlating the relative proportions of these fractions to water salinity.
Main Results:
- The relative proportions of iron- and calcium-phosphate fractions are sensitive to depositional salinity.
- This method allows for direct paleosalinity estimations.
Conclusions:
- Sedimentary phosphate offers a reliable proxy for reconstructing past salinities.
- The method is applicable across the full spectrum from freshwater to marine environments.
