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Recent improvements in the statistical treatment of many in situ data now make it possible to decipher the related thermal events and so obtain reliable and precise ages.
Our work shows that a significant number of individual spot analyses is required to reach such precise information (i.e., more than 30.40 data).
Uraninite (UO) have been used, the latter containing U and/or Th in minor proportions.
Any stable U- or Th-bearing phase can be considered.
This dating method has become very popular for dealing with Precambrian terranes where it can often be difficult to resolve relationships between rock units and the geological history. It must be assumed that when the zircon grains crystallized, no radiogenic Pb was in them, and that all the radiogenic Pb now measured was derived by radioactive decay from U and Th.