Preprints
https://doi.org/10.5194/se-2021-129
https://doi.org/10.5194/se-2021-129

  17 Nov 2021

17 Nov 2021

Review status: this preprint is currently under review for the journal SE.

Whole-rock and zircon evidence for evolution of the Late Jurassic high Sr/Y Zhoujiapuzi granite, Liaodong Peninsula, North China Craton

Renyu Zeng1,2, Mark Allen3, Xiancheng Mao4, Jianqing Lai4, Jie Yan1,2, and Jianjun Wan1,2 Renyu Zeng et al.
  • 1State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, Jiangxi, China
  • 2School of Earth Sciences, East China University of Technology, Nanchang, 330013, China
  • 3Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
  • 4School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

Abstract. Middle-Late Jurassic high Sr/Y granitic intrusions are extensively exposed in the Liaodong Peninsula, in the eastern part of the North China Craton (NCC). However, the genesis of the high Sr/Y signature in these intrusions has not been studied in detail. In this study, we report results of zircon U-Pb dating, Hf isotopic analysis and zircon and whole-rock geochemical data for the Late Jurassic Zhoujiapuzi granite in the middle part of the Liaodong Peninsula. The Zhoujiapuzi granite is high-K (calc-alkaline) and peraluminous in nature, with high SiO2 (68.1–73.0 wt %) and Al2O3 (14.5–16.8 wt %), low in TFe2O3 (1.10–2.49 wt %) and MgO (0.10–0.44 wt %), and with high Sr/Y (19.9–102.0) and LaN/YbN (14.59–80.40). Morphological and chemical studies on zircon grains show that there are two stages of zircon growth, interpreted as magmatic evolution in two distinct stages. The early stage of zircons (ESZ) reflects a crystallization environment of low oxygen fugacity and high TZr-Ti (Ti-in-zircon thermometer values: 669–792 °C); the late stage of zircons (LSZ) formed with high oxygen fugacity and lower TZr-Ti (498–720 °C). LA-ICP-MS U-Pb zircon dating yielded the formation ages of the ESZ and LSZ of ~162 ± 1 Ma and ~158 ± 1 Ma, respectively, with similar εHf(t) values in the range of &minus26.3– −22.8. Interpretation of the elemental and isotopic data suggests that the Zhoujiapuzi granite was a I-type granite derived from partial melting of basement in the region: ~2.17 Ga Liaoji granites. The high Sr/Y signature is most likely inherited from these source rocks. Based on the geochemical features and regional geological data, we propose that the Liaodong Peninsula in the Late Jurassic was part of a mature continental arc, with extensive melting of thick crust above the Paleo-Pacific subduction zone.

Renyu Zeng et al.

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Renyu Zeng et al.

Renyu Zeng et al.

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Short summary
1. Based on observations of the CL images and chemical analysis, two zircon growth stages in a magmatism can be distinguished. 2. Melting of a high Sr/Y (and La/Yb) source is an important process for the generation of Yanshanian high Sr/Y rocks in the NCC. 3. The granite formed in a compressional environment related to subduction.