But what if one or some combination of these assumptions is incorrect?Then the computed age based on the accumulation of daughter products will be incorrect (Stasson 1998).When plotted on an isochron diagram, rb sr dating equation mixed data points are all colinear with A and B:. For further information on fitting of lines to data also known as regression analysissee:.The discordia is often interpreted by extrapolating both ends to intersect the Concordia.An excellent semi-technical introduction to isotope dating methods with an emphasis on isochron rb sr dating equation Pb isotope dating is available in Dalrymple A Rb-Sr date which is at variance with other geochronometers may not be equaion, it may be providing data on an event which is not representing the age of formation of the rock.mansisyazilim.comal mansisyazilim.comance of Rb-Sr mansisyazilim.comology for datting mansisyazilim.comon of error/ limitations Uses Reference 2.It has been established through extensive experimentation that radioactive decay occurs at a constant rate. In this case, the initial condition is the amount of daughter isotope in the rock when it was formed.
For further information on fitting of lines to data also known as regression analysissee:. There are fairly complex means of assessing the fit versus the expected errors of measurement; even when "by eye" the data appear to be fairly colinear, it does not mean that the procedure will indicate a likely valid isochron.
In order to use the valuable information provided by radiometric dating, a new method had to be created that would determine an accurate date and validate the assumptions of radiometric dating. Isotope dating satisfies this requirement, as daughter products do not decay back to the original parent element.
For this purpose, isochron dating was developed, a process "that solves both of these problems (accurate date, assumptions) at once" (Stasson 1992). 2) The process must occur at a relatively uniform rate.
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In many cases, vating are independent cues such as geologic setting or the chemistry of the specimen which can suggest that such assumptions are entirely reasonable. Sr will contain both original and inherited alongwith radiogenic. The discordia is often interpreted by extrapolating both ends to intersect the Equatuon.