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In contrast, Earth’s most abundant lava rocks, which represent the mantle and make up the major oceanic ridges, have values between 0.703 and 0.705.
This difference may appear small, but, considering that modern instruments can make the determination to a few parts in 70,000, it is quite significant.
Rubidium 87 decays to Strontium 87 with a half life of xx my.
Rubidium and strontium are reasonably abundant and the decay is not branched, unlike potassium-argon.
Dissolved strontium in the oceans today has a value of 0.709 that is dependent on the relative input from the continents and the ridges.
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