Paleoproterozoic rejuvenation and replacement of Archaean lithosphere: Evidence from zircon U-Pb dating and Hf isotopes in crustal xenoliths at Udachnaya, Siberian craton

- Crustal xenoliths at Udachnaya pipe include both granulitic lower crust and gneissic upper crust.
- Lower crustal samples have a Paleoproterozoic U-Pb zircon age.
- Upper crustal samples are Neoarchaean (ca. 2.7 Ga).
- The Proterozoic lower crust does not correspond to reworking of the Archaean crust.
- The Archaean lithosphere was removed and replaced in the Paleoproterozoic.