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Zircon U-Pb dating is the most commonly used method for isotopic geochronology.

However, it has been a difficult issue when relating zircon U-Pb ages to metamorphic conditions in complex metamorphic rocks.

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Three methods have been proposed to link zircon U-Pb age to metamorphic conditions: (i) internal structure; (ii) trace element feature; (iii) mineral inclusion composition.

Such losses cause the U-ratios which yield the same ages (t) against one another, they form a so-called ‘concordia’ curve.

The concordia diagram is a very useful tool for investigating and interpreting disruptions of the U-Pb system caused by ‘episodic lead loss’.

As is the case for any isotopic system, the system needs to remain ‘closed’ in order to yield meaningful isotopic ages.

This sometimes is not the case, resulting in a loss of Pb and/or U.

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