# Rb sr isochron dating methods

While that is a bit extreme, it is not an inexpensive procedure. This is an important point. As a result, the data points with the most P the right-most ones on the plot move the greatest distance per unit time. It is accessible to those who haven't studied the field, and has even received reasonably positive review in creationist literature.

But the computed age is not affected. He didn't pretend that the age of the flows was the expected result, and he didn't make the false claim that his result was sufficient to call all isochron dating into question. Negative results are regularly published.

For example, as discussed in the talk. The Y-axis of the graph is the ratio of D to Di. Initial daughter product The amount of initial D is not required or assumed to be zero. Such assumptions will not always be accurate in the real world. That data is lacking from Austin's published works.

This results in an identical Y-value for the data points representing each mineral matching the Y-value of the source material. If one of these assumptions has been violated, the simple computation above yields an incorrect age. There is no good way to tell how close the computed result is likely to be to the actual age. It depends on the accuracy of the measurements and the fit of the data to the line in each individual case.

Several different investigators using several different dating methods consistently produce concordant results. And they will all be equally related to each other. There is an angular unconformity at the bottom of the Paleozoic layers.

References Generic Radiometric Dating The simplest form of isotopic age computation involves substituting three measurements into an equation of four variables, and solving for the fourth. This is measured directly. The same would be true of someone who buried evidence of many bad plots in favor of one good one. In fact, the resulting age in this case may well be meaningful and accurate. While isochrons are performed with that few data points, the best ones include a larger quantity of data.

This is a well-known and expected behavior of isochrons. And, like Dalrymple's book, it has also received reasonably positive review in creationist literature. Isochron dating methods For general information on isochron dating methods, see talk.

There are some isochron results which are obviously incorrect. This will be discussed in more detail in the section on Gill's paper below. Isochron methods avoid the problems which can potentially result from both of the above assumptions. Therefore, the Y-intercept of the isochron line gives the initial global ratio of D to Di.

If the results were essentially random numbers, that would not be the expected distribution of results. Specific loss of P required to yield a different colinear plot. Since Di will vary over different minerals, the isochron data can plot on a line when P vs D would not. This results in a range of X-values for the data points representing individual minerals.

The resulting age is meaningful, but it does not have the meaning which one might expect for the dating result i. Austin was aware of this, as his reference to Faure shows.

It is the standard text on the entire field, and includes a large number of references to the primary literature. It's not his problem if the originally published age is incorrect. Besides, this line of argument does not address the fact that the result is a known and expected behavior of isochrons. The situation which you describe wouldn't result in an age. No best-fit line can be derived from a single point and therefore no age would result.

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