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In early Earth history, the continental crust was enriched in uranium.

Yet after the initial rise in atmospheric oxygen, about 2.4 billion years ago, the aqueous mobility of oxidized uranium resulted in its significant transport to the oceans and, ultimately, by means of subduction, back to the mantle U ratios higher than does the bulk Earth, confirming the widespread pollution of the upper mantle with this recycled uranium.

Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.We will deal with carbon dating first and then with the other dating methods.Carbon has unique properties that are essential for life on Earth.Elemental and isotope systematics of uranium in OIBs are strikingly consistent with previous OIB lead model ages, indicating that these mantle reservoirs formed between 2.4 and 1.8 billion years ago. In contrast, the uranium isotopic composition of MORB requires the convective stirring of recycled uranium throughout the upper mantle within the past 600 million years.2.3.

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Each of them typically exists in igneous rock, or rock made from cooled magma.

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