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Sensitive high-resolution ion microprobe U–Pb dating shows that a biotite orthogneiss from the Hercynian belt of western central Iberia contains 1000–300 Ma zircon. Older, 1000–570 Ma ages within this range represent inherited, detrital material among which four age components may be recognized: ∼980 Ma, ∼830 Ma, 616 ± 10(2σ) Ma and 582 ± 5(2σ) Ma. This inherited zircon commonly forms cores that a...

journal of petrology

A Sequence of Pan-African and Hercynian Events Recorded in Zircons from an Orthogneiss from the Hercynian Belt of Western Central Iberia--an Ion Microprobe U-Pb Study