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Two-stage magmatic events of the early Paleozoic in the eastern Hexi Corridor Belt, NW China: petrogenesis and tectonic implications

  • Xiaochen ZhaoEmail author
  • Chiyang Liu
  • Liang Duan
  • Changqing Fu
  • Mengqi Jin
Original Paper

Abstract

The petrogenesis and geodynamic implications of the early Paleozoic magmatic events in the eastern Hexi Corridor Belt, NW China, remain poorly constrained. In this study, we present high-quality zircon U–Pb ages as well as geochemical and zircon Lu–Hf isotopic data for three early Paleozoic intrusive rocks from the Mafuxiazi area in the eastern Hexi Corridor Belt. The LA-ICP-MS U–Pb dating results suggest that there are two stages of magmatic activities during the late Ordovician (447 Ma) and late Silurian (426–423 Ma). The late Ordovician and late Silurian granitoids are predominated by metaluminous and belong to medium-K calc-alkaline and high-K calc-alkaline, respectively. Both two-stage granitoids have been identified as I-type granites. Geochemical characteristics show high Sr, low Y and Yb contents, and high La/Yb and Sr/Y ratios, with weakly negative or no significant Eu anomalies. However, the two-stage granitoids display different zircon Hf isotopic compositions, implying different source materials. The late Ordovician granitoids show negative to slightly positive zircon εHf(t) values of − 2.93~1.68 with crustal Hf model ages (TCDM) of 1318–1610 Ma, suggesting a mixed source from ancient crustal and mantle materials, whereas the late Silurian granitoids have a wide range of zircon εHf(t) values from − 27.34 to 3.00 (only three zircon grains show positive values) with older crustal Hf model ages (TCDM) of 1219–3117 Ma, indicating significantly ancient crustal contribution with limited mantle materials. Based on geochemical and geochronological data, accompanied with consideration of the regional geological setting, we suggest that the late Ordovician granitoids were most likely formed in a back-arc basin, whereas the late Silurian granitoids developed in a post-collision setting.

Keywords

Geochemistry Geochronology Early Paleozoic Magmatic events Tectonic implications Eastern Hexi Corridor 

Notes

Acknowledgments

The editor-in-chief of the Arabian Journal of Geosciences and anonymous reviewers are greatly appreciated for their detailed and constructive comments in improving our work.

Funding Information

This work is supported by grants from the National Natural Science Foundation of China Nos. 41802119 and 41330315, the Special Projects of China Geological Survey Nos. 12120113039900 and 12120114009201, and doctor’s fund of Xi’an University of Science and Technology No. 6310117052.

Supplementary material

12517_2019_4605_MOESM1_ESM.docx (47 kb)
Supplementary Table 1 (DOCX 47 kb)
12517_2019_4605_MOESM2_ESM.docx (37 kb)
Supplementary Table 2 (DOCX 36 kb)

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Xiaochen Zhao
    • 1
    Email author
  • Chiyang Liu
    • 2
  • Liang Duan
    • 2
  • Changqing Fu
    • 1
  • Mengqi Jin
    • 3
  1. 1.College of Geology and EnvironmentXi’an University of Science and TechnologyXi’anChina
  2. 2.State Key Laboratory of Continental Dynamics, Department of GeologyNorthwest UniversityXi’anChina
  3. 3.Xi’an Center of China Geology SurveyXi’anChina

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