The data points would be expected to start out on a line if certain initial conditions were met. A small deviation from a straight line tells us that there is some uncertainty about the date, and this degree of uncertainty can be calculated; and if we get something which is nothing like a straight line, then the method simply doesn't supply us with a date. Usually it is easy to determine whether or not this requirement is met. Larryn W. It's difficult to assess Gill's own example as if it were realistic, because his values are not real isotope measurements and are just pulled out of thin air. There are some isochron results which are obviously incorrect. Diamond; Rb-Sr dating of sphalerite based on fluid inclusion-host mineral isochrons; a clarification of why it works.
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A routine statistical operation on the set of data yields both a slope of the best-fit line an age and a variance in the slope an uncertainty in the age.
There is, however, one potential source of error which will not show up on the isochron diagram, since it is expected to produce a straight line. View Full GeoRef Record. Policies and guidelines Contact us.