Dating of eclogite-facies zircons: the age of Alpine metamorphism in the Sesia-Lanzo Zone (Western Alps)
Zircons from eclogite-facies rocks of the Sesia-Lanzo Zone have been investigated by cathodoluminescence and dated by ion microprobe (SHRIMP). Most of the zircons show a oscillatary or sector zoned core, which is surrounded by a weakly zoned or unzoned rim, irregular in shape. The U-Th-Pb analyses revealed that, opposite to the cores, the zircon rims have low U- and Th-contents, very low Th/U ratios and that their U-Pb systems were reset or they lost lead at the time of metamorphism. This study...[Show more]
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|Source:||Earth and Planetary Science Letters|
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