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Journal of Earth Science

, Volume 28, Issue 2, pp 241–248 | Cite as

Blueschist from the Toudaoqiao area, Inner Mongolia, NE China: Evidence for the suture between the Ergun and the Xing’an blocks

  • Limin Zhao
  • Akira Takasu
  • Yongjiang Liu
  • Weimin Li
Petrology and Petrogeochemistry

Abstract

Blueschist accompanied by pelitic schist expose along the Xinlin-Xiguitu fault in the Toudaoqiao area, northeastern China. In this paper, the blueschist is systematically studied on the petrography and mineral chemistry. The amphiboles in the blueschist are zoned from winchite core to magnesioriebeckite/glaucophane rim to winchite outermost rim. The peak metamorphic conditions are defined by the mineral assemblage of magnesioriebeckite/glaucophane, epidote, high-Si phengite (Si<7.1), chlorite, albite, hematite and quartz, indicating an epidote-blueschist facies metamorphism. The P-T conditions are estimated as T=350-400 °C and P=10-12 kbar. The occurrence of the blueschist along the Xinlin-Xiguitu fault strongly suggests the fault is the suture between the Ergun and the Xing'an blocks situated in the eastern portions of the Central Asia orogenic Belt (CAOB).

Key Words

Toudaoqiao blueschists zoned amphibole P-T path Xinlin-Xiguitu suture 

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Notes

Acknowledgments

We thank the members of the Metamorphic Seminar and the Geoscience Seminar, Shimane University for helpful discussion and suggestions. We also thank Profs. W., Jin, C. Q., Zheng, Dr. Q. B., Wen, L., Zhang and Y. L., Shao, of the College of Earth Sciences, Jilin University, for their suggestion and help in the field. This study was supported by 973 program (No. 2013CB429802) to Y.J. Liu, the National Natural Science Foundation of China (Grant 41302175) to W. M. Li, Jilin University and JSPS Grant-in-Aid for Scientific Research (Nos. 17340149, 24340124) to A. Takasu, Shimane University, Japan. The final publication is available at Springer via http://dx.doi.org/10.1007/s12583-017-0721-0.

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Copyright information

© China University of Geosciences and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Limin Zhao
    • 1
  • Akira Takasu
    • 2
  • Yongjiang Liu
    • 1
  • Weimin Li
    • 1
  1. 1.College of Earth SciencesJilin UniversityChangchunChina
  2. 2.Department of GeoscienceShimane UniversityMatsueJapan

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