UNIGE document Scientific Article
previous document  unige:37909  next document
add to browser collection
Title

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

Authors
Kryza, Ryszard
Oberc-Dziedzic, Teresa
Pin, Christian
Published in International Journal of Earth Sciences. 2014, vol. 103, no. 3, p. 683-696
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 lateand post-magmatic alteration
Keywords U–Pb zircon geochronologyID-TIMSComposite granitoid plutonsVariscan granitoidsKarkonosze Pluton
Identifiers
Full text
Article (Published version) (725 Kb) - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://link.springer.com/10.1007/s00531-013-0995-0
Structures
Research group Isotope Geochemistry, Geochronology and Thermochronology
Citation
(ISO format)
KRYZA, Ryszard et al. Geochronology of a composite granitoid pluton: a high-precision ID-TIMS U–Pb zircon study of the Variscan Karkonosze Granite (SW Poland). In: International Journal of Earth Sciences, 2014, vol. 103, n° 3, p. 683-696. https://archive-ouverte.unige.ch/unige:37909

225 hits

4 downloads

Update

Deposited on : 2014-06-18

Export document
Format :
Citation style :