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Errors in isotopic ratio measurements must be used correctly (see The significance of i. If the MSWD value is not quoted, it can easily be calculated and used in conjunction with Chi Square Tables to assess reliability. I briefly consider age spectra where low temperature steps yield older ages than those at higher temperatures.The former and latter derive gas from low and high argon rentention sites respectively.data on whole-rock material, though the methods are applicable to all published plateau data.I illustrate the use of the techniques by looking at published age data for hotspot tracks in the Atlantic Ocean (the Walvis Ridge), as well as newly published ages for the British Tertiary Igneous Province.dating laboratories has led to a large number of papers reporting age data.When a reasonable number of consecutive steps, carrying a substantial amount of the total argon released, give the same age, the resulting average value carries geological significance.For unmetamorphosed igneous rocks, the latter would normally represent the crystallization age.The first is due to the presence of excess (1999) showed that almost all the ages were untenable as crystallization values.In this web page, I take a similar approach (but one that is somewhat easier to visualize) to evaluate these ages based on their age spectra. Elsewhere it will be shown that this conclusion is fully supported by critical examination of the individual age spectra.

There is no justification for quoting an age of 58.48 Ma with a very small error margin of ±0.18 The plate motion model derived by (2001) reported a number of plateau/isochron ages for both rocks and mineral separates from the BTIP. BM67 and 64 (Ben More lavas) were said to yield plateau ages of 58.66 ± 0.25 Ma and 58.19 ± 0.26 Ma, respectively, although many step ages obviously do not overlap in each case.These authors used these “ages” for defining the time of initiation and duration of flood-basalt volcanism in this province and to refine details (cryptochrons) of the geomagnetic polarity time scale from ~ 60 – 55 Ma. The MSWD ~ 26 and ~ 18, yield ( 2001), that the statistically significant mean value is 58.19 ± 0.26 Ma?Any two points in the universe lie on a straight line!In evaluating isochron “goodness of fit parameters”, the number of degrees of freedom for Chi Square Tables is N-2, and for two steps, this is zero.




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