Journal of Earth Science

, Volume 29, Issue 1, pp 21–29 | Cite as

An FTIR Study of Kyanite in the Maobei Kyanite-Bearing Eclogites from the Sulu Orogenic Belt, Eastern China

  • Yi-Ning Wu
  • Yong-Feng Wang
Mineralogy and Petrogeochemistry


As a minor phase, kyanite has been repeatedly shown to have experienced ultrahigh pressure (UHP) metamorphism together with its host eclogites. Thus, it could play some role in transporting water into the deep earth. Here we present a detailed investigation of water concentrations of kyanite, and for reference, of garnet and omphacite from four Maobei eclogites in the Sulu orogenic belt, eastern China. Fourier transform infrared (FTIR) measurements show that kyanites, garnets, and omphacites all have distinct hydroxyl absorption bands due to OH groups bound in their crystal structure. The FTIR profile analyses on ten grains from different samples reveal a homogeneous distribution of water across kyanite, suggesting insignificant water loss during exhumation. The calculated water concentrations in kyanite (21 wt ppm–41 wt ppm) are comparable to those reported previously for kyanite from various geological occurrences when using the most recent calibration. They are however much lower compared with those in garnet (46 wt ppm–83 wt ppm) and omphacite (302 wt ppm–548 wt ppm) from the Maobei eclogites. This implies that kyanite is not a major water carrier in eclogites considering its low volume fraction and contributes negligibly to transport water into the deep mantle accompanying subducted oceanic crust until its possible transformation to AlSiO3OH.

Key words

kyanite water contents eclogite Sulu orogenic belt 


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We thank Profs. Ke-Qing Zong, Hai-Jun Xu, and Qiang Liu for help during the field work. Dr. Da-Peng Wen is greatly thanked for assistance with the FTIR measurements. We also appreciate Prof. Jun-Feng Zhang for his constructive discussion and suggestions. Two anonymous reviewers are thanked for their thoughtful comments and suggestions. This study was supported by the National Natural Science Foundation of China (Nos. 41372224 and 41590623). The final publication is available at Springer via

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Copyright information

© China University of Geosciences and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.School of Earth SciencesChina University of GeosciencesWuhanChina
  2. 2.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhanChina
  3. 3.Global Tectonic Center, School of Earth SciencesChina University of GeosciencesWuhanChina

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