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SHRIMP single zircon U-Pb dating of the Kongling high-grade metamorphic terrain: Evidence for >3.2 Ga old continental crust in the Yangtze craton |
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| Institution: | 1. Department of Geology，Northwest University, Xi'an 710069, China;Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 2. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 3. Key Center for Teaching and Research in Strategic Mineral Deposits, The University of Western Australia, Nedlands 6907, Perth, Australia |
| Abstract: | Single zircons from two trondhjemitic gneisses and two clastic metasedimentary rocks without Eu anomaly of the Kongling high-grade metamorphic terrain are dated by the in situ SHRIMP U-Pb method. The results show that the trondhjemitic magma emplaced at 2947-2903 Ma. Concordant age of as old as 3.3 Ga is present in the detrital zircons from the clastic metasedimentary rocks. Together with the depleted mantle Nd model age (TDM =3.2-3.3 Ga) of the clastic metasedimentary rocks, this documents the presence of Paleoarchean continental crust in the Yangtze craton. |
| Keywords: | Kongling high-grade metamorphic terrain zircon U-Pb age SHRIMP Archean Yangtze craton |
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