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U-Pb Zircon and Sm-Nd isotopic study of the huangtuling granulite, dabie-sulu belt, China: Implication for the paleoproterozoic tectonic history of the yangtze craton

Min Sun^*,, Nengsong Chen^**, Guochun Zhao^*, Simon A. Wilde^***, Kai Ye, Jinghui Guo, Yi Chen and Chao Yuan

^* Department of Earth Sciences, University of Hong Kong, Hong Kong, China
^** Faculty of Earth Sciences, China University of Geosciences, Wuhan 430073, China
^*** Department of Applied Geology, Curtin University of Technology, Bentley 6102, Western Australia
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Guangzhou Institute of Geochemistry, Guangzhou 510640, China

Corresponding author: e-mail: minsun{at}hku.hk; tel: (852) 28592194; fax: (852) 25176912

SIMS data demonstrate Archean (2.9 to 2.7 Ga) and Paleoproterozoic (1991 ± 43 Ma) ages for rounded detrital zircon cores and unzoned rims respectively in a graulite sample collected from Huangtuling, Dabie-Sulu orogenic belt, China. The granulite rocks in this locality have pelitic compositions and represent an exposure of the northern margin of the Yangtze Craton. The rounded zircon cores show oscillatory zoning and have Th/U ratios (0.17 – 0.78) systematically higher than those of the unzoned luminescent rims (0.005 – 0.03). The age of the detrital zircon cores and whole rock Nd isotope model age suggest that the Huangtuling granulite was possibly derived from a provenance dominated by Archean rocks similar to the Kongling Complex exposed 200 km in the southwest. Multiple phases of metamorphism have been identified for the granulites, with the dominant granulite-facies mineral assemblage, defining an early clock-wise metamorphic P-T path. Orthopyroxene, plagioclase and whole-rock material define a linear trend in a ¹⁴⁷Sm/¹⁴⁴Nd – ¹⁴³Nd/¹⁴⁴Nd diagram, corresponding to an age of 1926 ± 146 Ma. This result and the U-Pb data for the zircon rims suggest that a collisional event may have occurred along the northern margin of the Yangtze Craton at 2.0 Ga, inviting further study on whether the Yangtze Craton was involved in the assembly of the recently-proposed Paleo-Mesoproterozoic supercontinent Columbia.