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Metamorphic P-T-t Path of UHT Granulites from the North Tongbai Orogen, Central China

  • Metamorphism, Magmatism and Tectonic Evolution of Central China Orogenic Belts
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Abstract

Although zircon U-Pb geochronometer has been widely used for dating metamorphism in moderate- to high-grade metamorphic rocks, it is still difficult to link the zircon U-Pb age to pressure and temperature (P-T) conditions. In this study, zircon trace elements and Hf isotopes and REE partitioning between zircon and garnet are adopted to track the formation condition of zircon in the granulites from North Tongbai Orogen, Central China. Combined with previous metamorphic P-T path results, a quantitative integrated anticlockwise P-T-t path was established for Tongbai granulites. These granulites recorded an early low-P heating followed by a dramatic pressure increase. Evidence for the prograde history (M1) is provided by cordierite, orthopyroxene and biotite inclusions in garnet. The prograde metamorphism occurred at around 443±3 Ma, with P-T conditions of ca. 730–820 °C and <6 kbar. The peak metamorphic (M2) condition is >920 °C and 8.5–10 kbar and the peak metamorphism age is ca. 432±4 Ma. At around 419 Ma, the granulites suffered an amphibolite-facies retrograde metamorphism (M3), represented by the replacement of garnet by biotite and plagioclase, and clinopyroxene by amphibole, with metamorphic condition of ca. 700 °C and ca. 7 kbar. The last retrograde metamorphism (M4) is a greenschist-facies overprint with an age of ca. 404 Ma. It is concluded that the metamorphism of Tongbai granulite lasted for more than 40 Ma, including a stage of more than 20 Ma granulite-facies metamorphism. The prolonged granulite-facies metamorphism resulted from the continuous northward subduction of the Shangdan oceanic crust beneath the North Qinling terrane.

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Acknowledgements

This paper is dedicated to Prof. Zhendong You on the occasion of his 90th Birthday. We are grateful to three anonymous reviewers for critical and constructive reviews of the manuscript. This work was supported by the National Natural Science Foundation of China (No. 41302040) and the China Geological Survey (No. DD20160201). The final publication is available at Springer via https://doi.org/10.1007/s12583-018-0855-8.

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  1. Key Laboratory of Deep-Earth Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

    Hua Xiang & Zeming Zhang

  2. School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China

    Zeming Zhang

  3. School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China

    Liming Zhao, Zengqiu Zhong & Hanwen Zhou

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Xiang, H., Zhang, Z., Zhao, L. et al. Metamorphic P-T-t Path of UHT Granulites from the North Tongbai Orogen, Central China. J. Earth Sci. 29, 1116–1131 (2018). https://doi.org/10.1007/s12583-018-0855-8

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