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- W4230310067 abstract "Rb-Sr, Sm-Nd, Lu-Hf, Re-Os, and Pb-Pb radiometric dating all employ the isochron method to determine ages. All of these systems have decays with long half-lives—from less than a billion (235U) to over a hundred billion years (147Sm). All involve a radioactive parent isotope in one element decaying to a radiogenic daughter in another element, generally with abundant pre-existing daughter isotopes. Rb-Sr, Sm-Nd, and Lu-Hf radiometric systems are similar in that both parent and daughter elements are lithophile and incompatible in mantle phases, which results in their concentration in the crust. All these elements are sufficiently abundant in crustal materials to allow routine isotopic analysis. The Re-Os system differs in that both elements are siderophile and are concentrated in the core. Re is incompatible and Os is compatible in mantle phases, resulting in high Re/Os ratios, but very low Os concentrations, in crustal materials. The Pb-Pb system differs in that it combines the two U-Pb decays in such a way that removes U from the equations; ages are determined based on variations in Pb isotopes. As a group, these systems, particularly Rb-Sr, Sm-Nd, and Pb-Pb, were some of the earliest radiometric dating systems used to provide ages of Earth and planetary materials. The current use of these systems for geochronology has been in specialized applications such as garnet dating (Sm-Nd and Lu-Hf), other age determinations utilizing high parent/daughter ratios (Re-Os), and ages utilizing mineral isochrons in closed system materials (Rb-Sr and Pb-Pb)." @default.
- W4230310067 created "2022-05-11" @default.
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- W4230310067 date "2021-01-01" @default.
- W4230310067 modified "2023-09-25" @default.
- W4230310067 title "Radiometric Dating by Rb-Sr, Sm-Nd, Lu-Hf, Re-Os, and Pb-Pb" @default.
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- W4230310067 doi "https://doi.org/10.1016/b978-0-08-102908-4.00038-2" @default.
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