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The process begins with suitable inclusion-bearing diamond crystals.As Shirey tells us, obtaining such diamonds for study is quite a challenge.

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Such crystals may preserve minerals from deep in the mantle and provide a record of temperature and pressure conditions there. Information that illuminates the earth’s early history and the planet’s structure at depths hundreds of kilometers beneath our feet.

Research using the rhenium-osmium decay system proves that some diamonds are of remarkable antiquity, says Shirey.

“They’re sometimes the oldest minerals we can find on the earth…up to 3.5 billion years old, whereas the earth is only 4.5 billion years old, so they’re often three-quarters of the age of the earth.” Shirey adds that diamonds are also special because they’re the deepest minerals we can obtain as natural samples to study the earth.

They decay very slowly over eons, with very long half-lives (the time it takes for a substance’s radiation to fall to half its original level).

The isotope of rhenium he uses, years, or 41 billion years.




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