Section 16 introduces a selection of statistical methods to help interpret collections of multiple geochronological datasets that are useful in detrital geochronology.Finally, Section 17 sets out a roadmap for future developments to improve the accuracy and precision of geochronological data, and to provide closer integration of website is perfectly platform-independent.The principal aim of this paper is to provide a general overview of the design philosophy and basic operating principles behind the software, rather than a detailed manual of all its components.
Sections 10-15 provide specific details about the Rb-Sr, Sm-Nd, Lu-Hf, Re-Os, Ar, U-Pb, Pb-Pb, U-Th-He, fission track and U-series dating methods.
The computer code for both programs is made available under the GPL license, which permits re-use and modification provided that any derived code is released under the same conditions (Free Software Foundation, 2007). Without analytical uncertainties, it is impossible to ascertain whether the difference between two geochronological dates is real, or simply an artifact of analytical imprecision.
is a likelihood function, then the error propagation is done by inverting the (negative) matrix of its second derivatives.
If some data has been rejected from one ratio but not another, then this relation will not work.
Finally, for isotopic data that are analysed asynchronously, such as Rb-Sr or Sm-Nd measurements involving liquid chromatography, the covariance can be obtained from the parent and daughter element concentrations and the daughter isotopic ratio.