Abstract
This paper summarizes the geochronological, geochemical and zircon Hf isotopic data for Mesozoic granitoids within the Erguna Massif, NE China, and discusses the spatial-temporal variation of zircon Hf isotopic compositions, with the aim of constraining the accretion and reworking processes of continental crust within the Erguna Massif, and shedding light on the crustal evolution of the eastern segment of the Central Asian Orogenic Belt. Based on the zircon U-Pb dating results, the Mesozoic granitic magmatisms within the Erguna Massif can be subdivided into five stages: Early-Middle Triassic (249–237 Ma), Late Triassic (229–201 Ma), Early-Middle Jurassic (199–171 Ma), Late Jurassic (155–149 Ma), and Early Cretaceous (145–125 Ma). The Triassic to Early-Middle Jurassic granitoids are mainly I-type granites and minor adakitic rocks, whereas the Late Jurassic to Early Cretaceous granitoids are mainly A-type granites. This change in magmatism is consistent with the southward subduction of the Mongol-Okhotsk oceanic plate and subsequent collision and crustal thickening, followed by post-collision extension. Zircon Hf isotopic data indicate that crustal accretion of the Erguna Massif occurred in the Mesoproterozoic and Neoproterozoic. Zircon εHf(t) values increase gradually over time, whereas two-stage model (T DM2) ages decrease throughout the Mesozoic. The latter result indicates a change in the source of granitic magmas from the melting of ancient crust to more juvenile crust. Zircon εHf(t) values also exhibit spatial variations, with values decreasing northwards, whereas TDM2 ages increase. This pattern suggests that, moving from south to north, there is an increasing component of ancient crustal material within the lower continental crust of the Erguna Massif. Even if at the same latitude, the zircon Hf isotopic compositions are also inconsistent. These results reveal lateral and vertical heterogeneities in the lower continental crust of the Erguna Massif during the Mesozoic, which we use as the basis of a structural and tectonic model for this region.
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Thanks to the reviewers’ comments and suggestions, it is very important to improve the quality of this paper. We also thank the staff of the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China, and the Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, for their advice and assistance during U-Pb zircon dating, major and trace element analyses, and Hf isotope analysis. This work was supported by the MOST of China (Grant No. 2016YFC0600403) and the National Natural Science Foundation of China (Grant No. 41330206).
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Sun, C., Tang, J., Xu, W. et al. Crustal accretion and reworking processes of micro-continental massifs within orogenic belt: A case study of the Erguna Massif, NE China. Sci. China Earth Sci. 60, 1256–1267 (2017). https://doi.org/10.1007/s11430-016-9033-5
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DOI: https://doi.org/10.1007/s11430-016-9033-5