As regards the metamorphic context, zircon can potentially preserves multiple stages of metamorphic records owing its highly refractory nature, high closure temperature and slow diffusion rate of Pb, thus it is an ideal mineral for U-Pb dating of poly-metamorphic rocks [9,10].
In addition, in situ analyses of trace elements such as rare earth elements (REE) in zircon and between zircon and coexisting minerals is usefull to decipher the REE behavior and mineral chemistry during metamorphism and to determine metamorphic P-T conditions [8,11,12].
Earth and Planetary Sciences » Geology and Geophysics » "Geochronology - Methods and Case Studies", book edited by Nils-Axel Morner, ISBN 978-9-1, Published: July 25, 2014 under CC BY 3.0 license. Scale bar: 50 μm In situ U-Pb dating combined with SEM images on zircon crystals represent a powerful tool to reconstruct metamorphic and magmatic evolution of basements recording a long and complex geological history [1-3].
Cathodoluminescence images of zircons in metabasic rocks, augen gneisses, fine grained leucocratic gneisses and amphybolitic gneisses showing characteristic oscillatory zoning interpreted as indicative of their magmatic origin.
The most suitable location of the spots for U-Pb analyses was then selected.