Talk:Ionium–thorium dating - Wikipedia Talk:Ionium–thorium dating - Wikipedia

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Learn More in these related Britannica articles: When these assumptions are valid, an accurate date may be obtained for the age of marine sediments. Thus, the amount of ionium in sediments can be used as a rough measure of the ionium-dating of sediment.

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The validity of the ionium-thorium age method is based upon the following assumptions: Because uranium compounds are soluble in seawater, while thorium compounds are quite ionium-dating, the thorium isotopes produced by the decay of uranium in seawater are readily precipitated and incorporated in sediments.

Thus, the amount of ionium in sediments can be used as a rough measure of the age of sediment.

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In this case, thorium in seawater, produced principally by the decay of uranium, is deposited preferentially in the sediment without the… Because uranium cac online dating auction are soluble in seawater, while thorium compounds are quite insoluble, the thorium isotopes produced by the decay of uranium in seawater are readily precipitated and incorporated in sediments.

This method does not require a constant rate of sedimentation of ionium but simply that the two isotopes are precipitated in a constant proportion. One of these thorium isotopes, thorium also known as ioniumhas a half-life of about 80, years, which makes it suitable for dating sediments as old asyears.

One of these thorium isotopes, thorium also known as ioniumhas a half-life of about 80, years, which makes it suitable for dating sediments as old asyears.

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This method does not require a constant rate of sedimentation of ionium but simply that the two isotopes are precipitated in a constant proportion. Accurate dating by measurement of ionium alone requires that the rate of sedimentation of ionium be constant with time, an assumption that does not hold for many sediments; any thorium present in seawater will also precipitate, and the decay of the ratio of ionium to thorium can be used as a measure of time.

Accurate dating by measurement of ionium alone requires that the rate of sedimentation of ionium be constant with time, an assumption that does not hold for many sediments; any thorium present in seawater will also precipitate, and the decay of the ratio of ionium to thorium can be used as a measure of time.

The validity of the ionium-thorium age method is based upon the following assumptions: The insoluble nature of thorium provides for an additional disequilibrium situation that allows sedimentation rates in the modern oceans to be determined.

When these assumptions are valid, an accurate date may be obtained for the age of marine sediments.