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Origin of Middle Cambrian and Late Silurian potassic granitoids from the western Kunlun orogen, northwest China: a magmatic response to the Proto-Tethys evolution

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Abstract

This paper presents new SHRIMP zircon U–Pb chronology, major and trace element, and Sr–Nd–Hf isotopic data of two Early Paleozoic granitic plutons (Yierba and North Kudi) from the western Kunlun orogen, in attempt to further constrain the Proto-Tethys evolution. SHRIMP zircon U–Pb dating shows that the Yierba pluton was emplaced in the Middle Cambrian (513 ± 7 Ma) and the North Kudi pluton was emplaced in the Late Silurian (420.6 ± 6.3 Ma). The Yierba pluton consists of quartz monzodiorite, quartz monzonite and granodiorite. These granitoids are metaluminous and potassic, with initial 87Sr/86Sr ratios of 0.7072–0.7096, εNd (T) of −0.2 to −1.6 and εHf (T) (in-situ zircon) of −1.2. Elemental and isotopic data suggest that they were formed by partial melting of subducted sediments, with subsequent melts interacting with the overlying mantle wedge in an oceanic island arc setting in response to the intra-oceanic subduction of Proto-Tethys. The North Kudi pluton consists of syenogranite and alkali-feldspar granite. These granites are metaluminous to weakly peraluminous and potassic. They show an affinity of A1 subtype granite, with initial 87Sr/86Sr ratios of 0.7077–0.7101, εNd (T) of −3.5 to −4.0 and εHf (T) (in-situ zircon) of −3.9. Elemental and isotopic data suggest that they were formed by partial melting of the Precambrian metamorphic basement at a shallow depth (<30 km) during the post-orogenic regime caused by Proto-Tethyan oceanic slab break-off. Our new data suggest that the subduction of the Proto-Tethyan oceanic crust was as early as Middle Cambrian (∼513 Ma) and the final closure of Proto-Tethys was not later than Late Silurian (∼421 Ma), most probably in Middle Silurian.

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Acknowledgments

We are grateful to Hang-Qiang Xie for his assistance with SHRIMP zircon U–Pb dating, to Wei Pu for her assistance with measurements of whole-rock Sr and Nd isotopes, and to Ke-Jun Hou for his assistance with measurements of zircon Hf isotope. We thank Yigang Xu (Associate editor) and two anonymous reviewers for their thoughtful reviews and constructive comments. This work was financially supported by the National Natural Science Foundation (40972040; 40572037; 41272083).

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  1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, China

    Zheng Liu, Yao-Hui Jiang, Ru-Ya Jia, Peng Zhao, Qing Zhou, Guo-Chang Wang & Chun-Yu Ni

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  1. Zheng Liu
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Correspondence to Yao-Hui Jiang.

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Liu, Z., Jiang, YH., Jia, RY. et al. Origin of Middle Cambrian and Late Silurian potassic granitoids from the western Kunlun orogen, northwest China: a magmatic response to the Proto-Tethys evolution. Miner Petrol 108, 91–110 (2014). https://doi.org/10.1007/s00710-013-0288-0

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