Abstract
Cratonic lamproites bear extreme Sr−Nd−Pb isotopic compositions widely known as enriched mantle I (EMI), yet the origin of the EMI reservoir remains controversial. Here, we explore this issue by examining Mg−Sr−Nd−Pb isotopic compositions of lamproites from Leucite Hills, Wyoming, USA. The δ26Mg values vary from the range of the normal mantle to lower values (− 0.43 to − 0.18 ‰), correlating with indices of the degree of carbonate metasomatism, an observation that can be best explained through mantle metasomatism by subducted carbonate-bearing sediments. With increasing extent of carbonate metasomatism, these samples display less extreme EMI Sr−Nd−Pb isotopic signatures, arguing for at least two metasomatic events that occurred in their mantle sources. The early metasomatic event associated with subducted continent-derived siliciclastic sediments led to the formation of the EMI Sr−Nd−Pb isotopic signatures while the recent carbonate metasomatism produced the light Mg isotopic signature but diluted the EMI Sr−Nd−Pb isotopic signatures. Our study indicates that a combination of Mg and Sr−Nd−Pb isotopes could be an effective tool in deciphering multiple-stage metasomatic events in mantle sources and places new constraints on the generation of enriched mantle reservoirs.
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Acknowledgements
We appreciate Roger H. Mitchell, Alex McCoy-West, Caroline Soderman, Sebastian Tappe and one anonymous reviewer for their helpful and constructive comments, which greatly improved the quality of our manuscript. The editor Prof. Hans Keppler is thanked for his careful and efficient editorial handling. This work was financially supported by the National Natural Science Foundation of China (Grants 41873036, 41703031 and 41729001), the China Postdoctoral Science Foundation (Grant 2017M620899), and Ministry of Science and Technology, Taiwan, Republic of China (MOST 109-2116-M-001-018).
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Sun, Y., Teng, FZ., Pang, KN. et al. Multistage mantle metasomatism deciphered by Mg−Sr−Nd−Pb isotopes in the Leucite Hills lamproites. Contrib Mineral Petrol 176, 45 (2021). https://doi.org/10.1007/s00410-021-01801-9
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DOI: https://doi.org/10.1007/s00410-021-01801-9