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Silicic air-fall tuffs are the most common volcanic rocks in fossil-bearing sequences and are found in layers that range in thickness from a millimeter to many meters and are commonly preserved in marine settings.

In most of these rocks the primary volcanic ash has been altered, probably soon after deposition, to clay minerals in a process that does not affect zircon.

Much of this understanding comes from experimental work in the realms of crystallography, mineral chemistry, and diffusion.

A good geochronometer must either have little to no initial incorporation of the daughter isotope or must have a fixed ratio from which the radiogenic and nonradiogenic proportions can be determined.

In order to calculate a date using the age equation it is required to determine the ratio of the parent isotope (P) to it's respective daughter isotope (D).

This requires quantitative determination of the relative proportions of both P and D isotopes, and often requires correction for the inclusion of non-radiogenic D.

This means that zircons tend to preserve their primary ages even in volcanic rocks metamorphosed to amphibolite-facies conditions.

The amount of time required for half of a given quantity of a parent radioactive element to decay into the daughter product is referred to as the half-life.

It is important however, that the half-life of an element is defined in terms of probability and is not the time required for exactly 50% of a given quantity to decay (e.g.

For example, common-Pb (or the natural occurrence of non-radiogenic lead) includes radiogenic isotopes (206, 207, 208) as well as non-radiogenic isotopes (204).

If the ratio of these is constant or measurable, then we can separate the radiogenic from the non to extract meaningful age information.




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For example, in the Middle Proterozoic Musgrave Block (northern South Australia), a wide scatter of K-Ar mineral "ages" was found, ranging from 343Ma to 4493Ma due to inherited (excess) , permitting inclusion of the gas in the crystallizing minerals.


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