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Coronas around Olivine in the Miaowan Olivine Norite, Yangtze Craton, South China

  • Shuhua Fan
  • Zhaochong ZhangEmail author
  • Changqian Ma
  • Qiuhong Xie
  • Lianxun Wang
  • Yanjie Li
  • Yuzhe Zhang
Article
  • 18 Downloads

Abstract

Coronitic microstructures have been used to interpret the late-stage solidification history of igneous rocks and to constrain the corresponding chemical and/or physical changes. Coronas with three shells were also recognized in the Miaowan olivine norite, Yangtze Craton, South China. In our study, orthopyroxene intergrowth with vermicular magnetite in the inner shell is in optical continuity with magnetite-free orthopyroxene in the middle shell. In the outer shell of brown amphibole remaining magnetite-free orthopyroxene inclusions sporadically occur. Meanwhile Mg# values of orthopyroxene (76–80) in the inner and middle shells are basically consistent with olivine (78–81). In this paper, we propose a multi-stage genetic model for the formation of coronas in the Miaowan olivine norite. In the first stage, the magnetite-free orthopyroxene shell formed through reaction between primocrystal olivine with the residual Si-rich melt at 990–1 053 °C and 6.2–6.5 kbar. In the second stage, the orthopyroxene-magnetite symplectite shell formed when primocrystal olivine reacted with the late-stage residual Fe-rich melt promoted by high oxygen fugacity condition at 927–1 035 °C and 6.0–6.5 kbar. In the third stage, the brown amphibole shell formed as the presence of residual hydrous melt and replaced the middle shell at 821–900 °C and 5.5–6.0 kbar.

Key Words

Yangtze Craton Miaowan olivine norite coronas orthopyroxene-magnetite symplectite magmatic origin 

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Notes

Acknowledgments

We thank Jianpei Lu for his help for observing thin sections. Shu Zheng, Yang Sun and Shiming Wang are appreciated for their assistance in the microprobe lab, Zhenbing She, Bin Liu, Fuhao Xiong, Zhiguo Cheng for their helpful advices on the interpretation of the coronas. We thank two anonymous reviewers for their constructive and valuable reviews that improved the manuscript. This work is financially supported by the National Key Research and Development Program of China (No. 2016YFC0600502), the National Natural Science Foundation of China (No. 41502046) and the Geological Survey Project of China (No. DD20160030). The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1012-8.

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Copyright information

© China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesBeijingChina
  2. 2.College of Desert Control Science and EngineeringInner Mongolia Agricultural UniversityHohhotChina
  3. 3.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhanChina
  4. 4.School of Earth SciencesLanzhou UniversityLanzhouChina

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