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1 Center for Strategic Mineral Deposits, Department of Geology and Geophysics, University of Western Australia, Nedlands 6907, Australia
2 Department of Geology, Northwest University, Xi'an 710069, and School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3 Center for Strategic Mineral Deposits, Department of Geology and Geophysics, University of Western Australia, Nedlands 6907, Australia
4 School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
Ion microprobe (SHRIMP II) U-Pb zircon analyses reveal trondhjemitic magmatism at 2.90–2.95 Ga in the Kongling area of the Yangtze craton, south China, about 150 km south of the Permian-Triassic Qinling-Dabie-Sulu orogenic belt. Detrital zircons from nearby Archean metapelites are 2.87–3.28 Ga, and the rocks have Sm-Nd depleted mantle model ages of 3.07–3.21 Ga. The new data reveal, for the first time, >3.2 Ga sialic crust in the Yangtze craton, part of which predates that of the adjacent southern North China craton. Both trondhjemites and metapelites contain ca. 2.75 Ga high-grade metamorphic zircons, and ca. 1.9 Ga zircons, related to intrusion of the Quanqitang K-feldspar granite into the Archean basement. Many zircons also underwent Pb loss ca. 1.0 Ga during the Jinning orogeny, when the Cathysian block accreted to the Yangtze craton. The new data support correlation of part of the Korean Peninsula with the Yangtze craton along the eastern extension of the Qinling-Dabie-Sulu orogenic belt.
Key Words: China • Yangtze craton • Archean • orogenic belt • SHRIMP U-Pb • crustal evolution
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