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1 Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China, and Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia
2 Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia, and Commonwealth Scientific and Industrial Research Organisation, Exploration and Mining, North Ryde, NSW 2113, Australia
3 Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia
4 Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
5 Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia
6 Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
7 Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China
U-Pb and Hf isotope analyses of zircons from felsic granulite xenoliths in Mesozoic volcanics reveal Early Archean (
3.6 Ga) lower crust beneath the younger (<2.85 Ga) southern margin of the North China craton, and suggest that the eastern part of the craton formed a coherent block by 3.6 Ga. Hf model ages indicate extraction of protoliths from the mantle ca. 4 Ga or earlier, followed by remelting at 3.6–3.7 Ga. Hf isotope data require both recrystallization of magmatic zircons, and growth of new zircon, up to ca. 1.9 Ga. One sample records 2.1–1.9 Ga remelting of a 2.5 Ga protolith. If large parts of the exposed upper continental crust elsewhere also are underlain by older lower crust, estimates of crustal growth rates through time will require revision.
Key Words: North China craton • Hf isotopes • zircon U-Pb dating • lower crustal granulites, • Archean crustal evolution
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