Questions tagged [geochronology]

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Ages of the Andean Cordilleras

What is the timing of the rise of the Andes, especially if focused on the chronosequence differences among (Western, Central, Eastern) Cordilleras uplift.
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How exactly did Patterson determine the parameters in his Pb–Pb geochron equations?

In his famous paper Age of meteorites and the earth (1956), Patterson uses the following expressions: Which I assume are the same as: $$ \left(\frac{Pb^{206}}{Pb^{204}}\right)_P = \left(\frac{Pb^{...
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How should core-rim detrital zircon ages be reported in a sedimentary provenance study?

I understand this might be drifting into the black hole of subjectivity but I would like to know if anyone knows if there is a generally accepted practice. If one has a detrital zircon with a core age ...
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Can zircons be analysed by the (U+Th)/He after being ablated for analysis of U-Pb?

I have zircons that have been mounted in a resin block. They have been polished to approximately half way through the zircons (as is convention) and they have been ablated to attain the U-Pb or Pb-Pb ...