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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.
Note that the same value of MSWD (= 2.5), makes an isochron statistically acceptable for up to 5 points (nu = 3), but unacceptable when seven or more points are used (nu I begin by looking at a hypothetrical data set.
Consider a case of five steps carrying equal quantities of gas giving rise to step ages of 99.0, 101.0, 100.0, 101.0 and 99.0 Ma, each with an error of ± 0.5 m.y.
Methodology The basic principle involved is to evaluate critically how much the step ages on the plateau differ from one another.
This is done by calculating the relevant Mean Square Weighted Deviate (MSWD = – 2) = 1, 3, 5, 10 the corresponding probability values are 0.11, 0.06, 0.03 and 0.005, respectively.
The plateau age of 100.00 Ma, with a standard error on the mean: of ± 0.22 Ma is found to be unacceptable, with p ~ 0.003 ( lie between ~ 99 and 101
However, its exact value, and equally important its error estimate, cannot be stated with statistical confidence.
At the end of the series of experiments, the step ages (± one sigma errors are quoted herein) are plotted against the cumulative amount of ).
This approach is designed to look at the gas released from sites of increasing argon retentivity.
The age of have a crystallization age in this range, but it contains excess argon (higher step ages on either side of the “plateau”).Tags: Adult Dating, affair dating, sex dating