Rb Sr Dating Method

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The Rb-Sr dating method has been used extensively in dating terrestrial and lunar rocks, and meteorites . If the initial amount of Sr is known or can be extrapolated, the age can be determined by measurement of the Rb and Sr concentrations and the 87 Sr / 86 Sr ratio . The dates indicate the true age of the minerals only if the rocks have not been subsequently altered .
The Rb-Sr method is commonly used to date Rb -rich minerals such as muscovite, biotite and K-feldspar; these minerals usually do not incorporate much Sr at the time of their formation (Goldschmidt's rules) . During the last decades also cogenetic whole rock samples were analysed by this method . The Rb-Sr method .
Definition . Parent - daughter ratio: The ratio of rubidium ( Rb ) to strontium ( Sr ) . The ratio is commonly expressed as 87 Rb / 86 Sr , where the unstable Rb -87 isotope is referred to as the parent nuclide, being approximately 27 % of all rubidium . The daughter nuclide ( Sr -87) is represented by Sr -86, which is stable and not subject to radiogenic . . .
The Rb-Sr method is commonly used to date Rb -rich minerals such as muscovite, biotite and K-feldspar; these same minerals usually do not incorporate much Sr at the time of their formation (Goldschmidt's rules) We usually use the isochron method to determine the age and initial 87Sr/86Sr ratio of a suite of rocks The Rb-Sr method
The Rb/Sr System . by β decay . The neutron emits an electron to become a proton . For this decay reaction, λ = 1 .42 x 10-11 /yr, τ 1/2 = 4 .8 x 10 10 yr . at present, 27 .85% of natural Rb is 87 Rb . If we use this system to plug into equation (2), then . 87 Sr * = 87 Rb (e λ t-1) (3) but, 87 Sr t = 87 Sr 0 + 87 Sr * or . 87 Sr * = 87 Sr t - 87 Sr 0
Rb -87 decays with a half-life of 48 .8 billion years to Sr -87 . This half-life is so long that the Rb-Sr method is normally only used to date rocks that are older than about 100 million years . Which minerals and rocks can be dated with the Rb-Sr method ? The minerals must contain Rb , which is a rather rare element .
The rubidium-strontium dating method is a radiometric dating technique that geologists use to determine the age of rocks . Development of this process was aided by Fritz Strassmann, who later moved onto discovering nuclear fission with Otto Hahn and Lise Meitner . The utility of the rubidium - strontium isotope system results from the fact that 87 . . .
rubidium—strontium dating A radiometric dating method based on the radioactive decay of 87 Rb to 87 Sr . Rubidium has two isotopes (85 Rb 72 .15%, 87 Rb 27 .85%), but only 87 Rb is radioactive . 87 Rb disintegrates in a single step to 87 Sr by the emission of a low-energy beta particle (see BETA DECAY) .Unfortunately this low-energy disintegration makes it very difficult to assess the half-life . . .
The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of rocks and minerals from the quantities they contain of specific isotopes of rubidium (87Rb) and strontium ( 87Sr, 86Sr) . 3 .
Numerical based on dating methods
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Rb Sr Dating Method