The multistage crystallization of zircon in calc-alkaline granitoids: U?Pb age constraints on the timing of Variscan tectonic activity in SW Iberia
CL imaging and U–Th–Pb data for a population of zircons from two of the Évora Massif granitoids (Ossa-Morena Zone, SW Iberia) show that both calc-alkaline granitoids have zircon populations dominated by grains with cores and rims either showing or not showing differences in Th/U ratio, and having ages in the range ca. 350–335 Ma (Early Carboniferous). Multistage crystallization of zircon is revealed in two main growth stages (ca. 344–342 Ma and ca. 336–335 Ma), well represented by...[Show more]
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|Source:||International Journal of Earth Sciences (Geologische Rundschau)|
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