Fisson track dating

06-May-2020 22:02 by 2 Comments

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In this article we shall discuss the basis of the U-Pb and Pb-Pb methods, and also fission track dating.The reader will find this article much easier to grasp if s/he has already mastered the material in the articles on K-Ar dating, Ar-Ar dating, and Rb-Sr dating.

Zircons, then, are relatively immune to the problems that make isochron U-Pb dating so difficult.Now since all rocks are somewhat porous, and since we are pretty much obliged to date rocks from near the surface, it's hard to find instances in which uranium has not been lost.; as you can see from its chemical formula, it is one of the silicate minerals.The apatites taken from volcanic rocks yield crystallization ages.In contrast, apatite ages obtained on basement rocks (granites, granodiorites, gabbros) are related to the uplift history of the Odenwald.Now lead and uranium are particularly susceptible to such shuffling in the event of even mild metamorphism.

The other problem is that uranium is particularly susceptible to weathering.Although it is not abundant in igneous rocks, it is sufficiently common to be used for the purposes of radiometric dating.It has two properties which make it useful for this purpose.But of course for isochron dating we need more than one mineral; zircons alone would not be enough.However, these facts about zircons, combined with what we know about uranium, suggest an alternative method of dating.If there is no lead in the zircon originally, and if no lead or uranium has been added or subtracted to the zircon since its formation, then the following formula will hold: , in which case the two t values are said to be concordant; whereas if lead and/or uranium has been added or subtracted, then it would require some sort of statistical fluke for the two t values to end up identical.

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