Rb Sr Dating Example

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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-Sr dating relies on correctly measuring the Rb-Sr ratio of a mineral or whole rock sample, plus deriving an accurate 87Sr/86Sr ratio for the mineral or whole rock sample . Several preconditions must be satisfied before a Rb-Sr date can be considered as representing the time of emplacement or formation of a rock . The system must have remained closed to Rb and Sr diffusion from the time at which the rock formed or fell below the closure temperature i .e the temperature at which a system has . . .
The Rb-Sr dating method has been used extensively in dating rocks . 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 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 and strontium . Development of this process was aided by German chemists Otto Hahn and Fritz Strassmann, who later went on to discover nuclear fission in December 1938 . The utility of the rubidium-strontium isotope system results from the fact that 87Rb decays to 87Sr with a half-life of 49 .23 . . .
earthsci .org › space › space › geotime › radate › radate .html
What steps are involved in Rb-Sr dating ? 1 . Select a fresh, unweathered rock sample . Sample Selection A geologist collects a fresh, unweathered hand sample for age dating . Fresh is the key word here, and means that the chemistry of the sample has NOT been changed since the sample formed .
hyperphysics .phy-astr .gsu .edu › hbase › Nuclear › meteorrbsr .html
Rubidium/Strontium Dating of Meteorites . The study of the rubidium/strontium isotopic ratios in a set of meteorite samples shows the general approach to this kind of radioactive dating .The isotope 87 Rb decays into the ground state of 87 Sr with a half-life of 4 .7 x 10 10 years and a maximum b-energy of 272 keV . 86 Sr is of non-radiogenic origin and can be used as a reference concentration to . . .
The radioactive decay of rubidium-87 ( 87 Rb ) to strontium-87 ( 87 Sr ) was the first widely used dating system that utilized the isochron method . Rubidium is a relatively abundant trace element in Earth's crust and can be found in many common rock-forming minerals in which it substitutes for the major element potassium .
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) .
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 . . .
Rubidium-Strontium dating ( Rb-Sr ) This scheme was developed in 1937 but became more useful when mass spectrometers were improved in the late 1950s and early 1960s . This technique is used on ferromagnesian (iron/magnesium-containing) minerals such as micas and amphiboles or on limestones which also contain abundant strontium .
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Rb Sr Dating Example