Abstract
This paper presents detailed SHRIMP zircon U–Pb chronology, mineral chemistry, major and trace element, and Sr–Nd–Hf isotope geochemistry of the Datong pluton and its quenched enclaves from the western Kunlun orogen, northwest China, in an attempt to achieve a better understanding on the origin of diverse arc magmas. The Datong host granitoids are intermediate to acid in composition (SiO2 = 57.5 ~ 73.1 wt.%), and exhibit high-K calc-alkaline to shoshonitic affinities. The quenched enclaves are silica-rich ultrapotassic rocks. Detailed SHRIMP zircon U–Pb dating indicates that the Datong pluton was emplaced in Ordovician time (473.4–447.7 Ma), which places the Datong pluton in an active continental margin setting, rather than a syn-collision setting of Early Silurian age. The Datong host granitoids were derived by partial melting of subducted sediments, with the subsequent melt interacting with the overlying mantle wedge during its ascent. Partial melting of the veined mantle wedge hybridized by sediment-derived melts generated the silica-rich ultrapotassic magma, which was injected into the Datong granitoid magma chamber and quenched, resulting in enclaves hosted by granitoids. This contribution provides evidence that arc magmas can be derived directly by partial melting of subducted sediments, which is helpful to further understand the origin of diverse arc magmas.
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Acknowledgments
We are grateful to Dr L.C. Miao for his assistance with SHRIMP U–Pb analyses, and to Dr H. Zhou for his providing detailed data of the Kuda paragneiss. We thank Andreas Moeller (Associate Editor) and three anonymous reviewers for their thoughtful reviews and constructive comments. The Editor, J.G. Raith, is also thanked for his helpful editorial handling of the manuscript and good suggestions for improvement. This work was financially supported by National Natural Science Foundation of China (40572037; 40972040) and the Key Project of Ministry of Education, China (No. 306007).
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Liao, SY., Jiang, YH., Jiang, SY. et al. Subducting sediment-derived arc granitoids: evidence from the Datong pluton and its quenched enclaves in the western Kunlun orogen, northwest China. Miner Petrol 100, 55–74 (2010). https://doi.org/10.1007/s00710-010-0122-x
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DOI: https://doi.org/10.1007/s00710-010-0122-x