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Updated: Jul 11, 2026

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

Published on: August 17, 2016

High-resolution stratigraphy with strontium isotopes.

D J Depaolo, B L Ingram

Science (New York, N.Y.)

|February 22, 1985

Summary

The strontium-87/strontium-86 isotopic ratio in marine fossils accurately dates sedimentary rocks. This geochemical method offers high-resolution age correlation for geological and paleontological studies.

Area of Science:

Geochemistry
Paleontology
Oceanography

Background:

The strontium-87/strontium-86 (⁸⁷Sr/⁸⁶Sr) isotopic ratio in modern seawater is relatively constant.
This ratio, however, changes gradually over geological timescales.
Marine organisms incorporate strontium from seawater into their carbonate shells, recording the oceanic ⁸⁷Sr/⁸⁶Sr ratio at the time of shell formation.

Purpose of the Study:

To evaluate the utility of the ⁸⁷Sr/⁸⁶Sr isotopic ratio in fossilized marine carbonate shells for geochronology.
To establish the potential of this method for high-resolution age correlation of sedimentary rocks.

Main Methods:

High-precision measurement of the ⁸⁷Sr/⁸⁶Sr isotopic ratio in fossilized marine carbonate shells.
Analysis of sedimentary rocks composed of accumulated fossil carbonate shells.

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Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides

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Last Updated: Jul 11, 2026

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Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research

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Main Results:

The ⁸⁷Sr/⁸⁶Sr ratio in fossil shells serves as a reliable proxy for the oceanic isotopic composition at the time of shell deposition.
High-precision measurements allow for precise dating and correlation of sedimentary sequences.

Conclusions:

The ⁸⁷Sr/⁸⁶Sr dating method provides age resolution comparable to other established techniques.
This geochemical approach is valuable for addressing diverse problems in geology, paleontology, paleoceanography, and geochemistry.