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Primordial lead is thought to have been formed by stellar nuclear reactions, released to space by supernovae explosions, and incorporated within the dust cloud that constituted the primordial solar system; the troilite (iron sulfide) phase of iron meteorites contains lead that approximates the primordial composition.The lead incorporated within the Earth has been evolving continuously from primordial lead and from the radioactive decay of uranium and thorium isotopes.

The uranium and thorium decay systems offer a multitude of radiometric dating options.This indicates that the penultimate deglaciation occurred earlier with respect to NHI than the last deglacial, beginning when NHI was at a minimum.common lead it contains; common lead is any lead from a rock or mineral that contains a large amount of lead and a small amount of the radioactive progenitors of lead—i.e., the uranium isotopes uranium-235 and uranium-238 and the thorium isotope thorium-232.U-Pb ages are accurate to within less than 1 per cent, highly resistant to metamorphism, and are considered the most precise ages now available.With modern laser ablation methods, a detailed history can be derived for single zircon grains showing the ages of growth zones within the zircon. " Suppose you actually want to date uranium minerals themselves, say in a pegmatite or uranium deposit.

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