International Journal of Earth Sciences

, Volume 103, Issue 3, pp 683–696 | Cite as

Geochronology of a composite granitoid pluton: a high-precision ID-TIMS U–Pb zircon study of the Variscan Karkonosze Granite (SW Poland)

  • Ryszard Kryza
  • Urs Schaltegger
  • Teresa Oberc-Dziedzic
  • Christian Pin
  • Maria Ovtcharova
Original Paper

Abstract

Resolving time differences between successive magmatic pulses in composite granitoid plutons is often a difficult task. High-precision CA-ID-TIMS zircon ages obtained from such a pluton, the Variscan Karkonosze Granite (NE part of the Bohemian Massif), provide evidence that the crystallization of the two main granite facies, porphyritic and equigranular, happened between 312.5 ± 0.3 and 312.2 ± 0.3 Ma, thus unresolvable at the 0.08–0.1 % precision level of a single 206Pb/238U age. This finding is at odds with most other previous dating attempts and asks for a re-evaluation of the previous scattered geochronological data. The main reasons for the scatter of the earlier dates obtained by various techniques can include analytical causes, the presence of older inheritance and disturbance of the U–Pb isotopic system, due to zircon metamictization (enhanced by high-U content in zircon) or late- and post-magmatic alteration.

Keywords

U–Pb zircon geochronology ID-TIMS Composite granitoid plutons Variscan granitoids Karkonosze Pluton 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Ryszard Kryza
    • 1
  • Urs Schaltegger
    • 2
  • Teresa Oberc-Dziedzic
    • 1
  • Christian Pin
    • 3
  • Maria Ovtcharova
    • 2
  1. 1.Institute of Geological SciencesUniversity of WrocławWrocławPoland
  2. 2.Earth and Environmental SciencesUniversity of GenevaGeneveSwitzerland
  3. 3.Département de Géologie, UMR 6524 CNRSUniversité Blaise PascalClermont-FerrandFrance

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