U-Pb Dating Equation

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U-Pb dating grants access to two separate geochronometers (206 Pb / 238 U and 207 Pb / 235 U ) based on different isotopes of the same parent-daughter pair (i .e . U & Pb ) . This built-in redundancy provides a powerful internal quality check which makes the method arguably the most robust and reliable dating technique in the geological toolbox .
Uranium-lead dating , abbreviated U-Pb dating , is one of the oldest and most refined of the radiometric dating schemes . It can be used to date rocks that formed and crystallised from about 1 million years to over 4 .5 billion years ago with routine precisions in the 0 .1-1 percent range .
The U , Th, Pb System . Two isotopes of Uranium and one isotope of Th are radioactive and decay to produce various isotopes of Pb . The decay schemes are as follows . 1 . by α decay . λ 238 = 1 .551 x 10-10 /yr, τ 1/2 = 4 .47 x 10 9 yr . 2 . λ 235 = 9 .849 x 10-10 /yr, τ 1/2 = 0 .707 x 10 9 yr . Note that the present ratio of . 3 .
The U-Pb dating method can yield the most precise ages for early solar-system objects due to the optimal half-life of 238 U . However, the absence of zircon or other uranium-rich minerals in chondrites, and the presence of initial non-radiogenic Pb (common Pb ), rules out direct use of the U-Pb concordia method . Therefore, the most precise dating method for these meteorites is the Pb - Pb method, which allows a correction for common Pb .
In a 704-million-year-old rock, 235U is at its half-life and there will be an equal number of 235U and 207Pb atoms (the Pb/U ratio is 1) . In a rock twice as old there will be one 235U atom left for every three 207Pb atoms (Pb/U = 3), and so forth .
Because no geologically meaningful results can be interpreted from the U-Th- Pb data at Koongarra (three uraninite grains even yield a 232 Th/ 208 Pb "age" of 0 Ma), serious questions must be asked about the validity of the fundamental/foundational basis of the U-Th- Pb " dating " method . This makes the task of creationists building their model for the geological record much easier, since claims of U-Th- Pb radiometric " dating " having "proven" the claimed great antiquity of the . . .
Five basic methods were tried that depended on the accumulation of He or Pb in the rock formation being dated . Method 1: The chemical Pb-U, Th method Method 2: The Pb -alpha method Method 3: The U-He method Method 4: The U , Th- Pb isotopic method (isochron method) Method 5: The common-lead method 2
Uranium-Lead dating is the geological age-determination method that uses the radioactive decay of uranium ( U ) isotopes (238 U , 235 U , and also in this entry 232 Th) into stable isotopes of lead ( Pb ) (206 Pb , 207 Pb , and 208 Pb , respectively) . U-Pb geochronology is the science of both the methodology but also the application of these methods to geological problems .
We used the relative difference between 238 U / 206 Pb and 235 U / 207 Pb ages as a measure of discordance because the 207 Pb / 206 Pb ages are unreliable for young ages and yielded even negative values for some TDR and FCT spots . We classified grains with single-grain ages greater than the weighted mean 238 U / 206 Pb age plus a 2% margin as inherited grains . 2 .3 .
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Il y a une quantité initiale de Pb , inconnue, variable selon la roche, et qui s'ajoute à la quantité d'origine radiogénique . L'étude de minéraux issus de météorites riches en Pb et très pauvres en U (sulfure de canyon diablo) permet de s'affranchir de ce problème : les rapports isotopiques du plomb y sont restés inchangés .
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U-Pb Dating Equation