Zircon U-Pb-Hf isotopes and geochemistry of Jurassic igneous rocks from the southern Zhangguangcai Range, NE China: constraints on magmatism, petrogenesis and tectonic implications

ABSTRACT

In this study, we present new zircon U-Pb and Hf isotope data and geochemical analyses for Jurassic igneous rocks from the southern Zhangguangcai Range, NE China. In the context of our new U/Pb data together with other published data (n = 165), we recognize three major magmatic pulses in the eastern Songnen Block during the Jurassic: earliest Jurassic (200–195 Ma), late Early Jurassic (183–175 Ma) and early Late Jurassic (ca. 163 Ma). According to the petrological classification scheme, rocks are divided into two categories of andesite and I-type granitoids. Generally, Early Jurassic monzogranites have more evolved compositions with SiO₂, Al₂O₃, and K₂O+Na₂O concentrations of 67–74 wt.%, 13.28–17.04 wt.% and 7.25–9.31 wt.%, respectively than Late Jurassic granodiorite. Early Jurassic andesite has SiO₂, Al₂O₃, Na₂O+K₂O contents of 54.64–56 wt.%, 17.27–17.44 wt.% and 3.47–4.06 wt.%, respectively with low Mg# values of 0.18–0.26. In addition, all samples show enrichment in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs) but depletion in high strength field elements (HSFEs, such as Nb, Ta, P and Ti) and low Sr/Y and (La/Yb)_N ratios, all of which are characteristic of arc-type magmatic signatures. In view of the Hf isotope signatures, these rocks show high initial ¹⁷⁶Hf/¹⁷⁷Hf ratios (0.282711–0.283069) corresponding to positive ε_Hf(t) values (+0.39 to +13.66) and Neoproterozoic two-stage model ages (1154–550 Ma). In summary, the geochemical results suggest that the primary magmas of Jurassic granitoids were derived from variable degrees of partial melting of juvenile lower crust, whereas Early Jurassic andesite was derived from the partial melting of mantle wedge peridotite metasomatized by hydrous melts from subducting sediments and/or oceanic crust. The Jurassic arc-type magmatism in the eastern Songnen Block indicates that the Mudanjiang oceanic plate was still subducting in the Jurassic.

Graphical abstract

KEYWORDS:

• Igneous rocks
• Jurassic
• Mudanjiang ocean
• Zircon U-Pb-Hf isotopes
• geochemistry

Acknowledgments

We sincerely thank Editor Robert J. Stern, and three anonymous reviewers for their constructive comments which greatly improved this manuscript. We also appreciate the staff of the State Key Laboratory of Continental Dynamics, Northwest University, Xi’an, China, for their assistance with zircon U-Pb and Lu-Hf analyses and express gratitude to American Journal Experts (AJE) for helping us improve the language.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary Material

Supplemental data for this article can be accessed here.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [41372108 and 41602110];Natural Science Foundation of Shandong Province [ZR201702150228,ZR2019PD001];Major Scientific and Technological Innovation Projects of Shandong Province [2017CXGC1602 and 2017CXGC1603];Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas, SDUST Research Fund [2015TDJH101];Postgraduate Science and Technology Innovation Project of Shandong University of Science and Technology [SDKDYC190314].