Abstract
Helium isotopic compositions are considered to be ideal tracers to identify whether mantle materials have been added to crustal rocks or fluids. In this paper, we present the helium isotopic compositions of the Songduo eclogites in the Lhasa terrane, Tibet. We found that garnet and omphacite in the eclogites have different helium retention characteristics. The 4He content of most omphacite grains are about 10–20 times of that of garnet, suggesting that omphacite has a higher ability to capture 4He than garnet. Similarly, there is about 10–20 times difference in 4He content between omphacite and garnet in the same eclogite samples. The 3He/4He ratios of garnet and omphacite in these rocks range from 0.27 to 0.60 Ra (relative to the modern air 3He/4He ratio, 1.4×10−6). These ratios are within the range of both mantle- and crust-derived helium, suggesting mixed sources. The Songduo eclogites have much higher 3He/4He ratios than those observed in the Dabie eclogites of eastern China. Such high ratios are typically thought to be associated with deep mantle sources. We cautiously conclude that deep mantle materials might have been involved during the formation of the Songduo eclogites.
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Acknowledgments
We gratefully thank Prof. Paul Robinson for the valuable comments and suggestions. Discussions with Prof. Zeming Zhang improved the paper significantly. This research was supported jointly by the National Natural Science Foundation of China (Nos. 41373029, 41773029) and the China Geological Survey (Nos. DD20190060, 12120114061501). The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1226-9.
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Li, Z., Yang, J., Li, T. et al. Helium Isotopic Composition of the Songduo Eclogites in the Lhasa Terrane, Tibet: Information from the Deep Mantle. J. Earth Sci. 30, 563–570 (2019). https://doi.org/10.1007/s12583-019-1226-9
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DOI: https://doi.org/10.1007/s12583-019-1226-9