Description Usage Arguments Details Value See Also Examples

The U-Pb method conventionally assumes initial secular
equilibrium of all the intermediate daughters of the
*{}^{238}*U-*{}^{206}*Pb and
*{}^{235}*U-*{}^{207}*Pb decay chains. Violation of
this assumption may produce inaccurate results. `diseq`

sets up initial disequilibrium parameters that are subsequently
passed on to the `read.data`

function for incorporation in
other functions.

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`U48` |
a list containing three items ( If If If |

`ThU` |
a list containing three items ( If If If If |

`RaU` |
a list containing three items ( If If |

`PaU` |
a list containing three items ( If If |

There are three ways to correct for the initial disequilibrium
between the activity of *{}^{238}*U, *{}^{234}*Th,
*{}^{230}*Th, and *{}^{226}*Ra; or between *{}^{235}*U
and *{}^{231}*Pa:

Specify the assumed initial activity ratios and calculate how much excess

*{}^{206}*Pb and*{}^{207}*Pb these would have produced.Measure the current activity ratios to infer the initial ratios. This approach only works for young samples.

The initial

*{}^{230}*Th/*{}^{238}*U activity ratio can also be estimated by providing the Th/U-ratio of the magma.

a list with the following items:

- U48, ThU, RaU, PaU
the same as the corresponding input arguments

- equilibrium
a boolean flag indicating whether

`option=TRUE`

and/or`x=1`

for all activity ratios- Q
the eigenvectors of the disequilibrium matrix exponential

- Qinv
the inverse of

`Q`

- L
a named vector of all the relevant decay constants

- n0
the initial atomic abundances of all the parent and daughter isotopes (used by

`mclean`

)

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