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Equation of state of a new calcium magnesium silicate compound with the composition Ca3MgSi2O8 at pressures up to 23 GPa and ambient T

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Abstract

Interaction between the Ca-rich and Ca-poor (or Mg-rich) domains in the mantle may lead to formation of some special calcium magnesium silicates (CMS), as indicated by the unusual mineral inclusion with the chemical formula Ca2.85Mg0.96Fe0.11Si2.04O8 enclosed in a super-deep diamond from Brazil. The equations of state (EoS) of these CMS compounds are thus important. With a diamond-anvil cell, here we performed in situ synchrotron X-ray diffraction experiments at high P (up to ~ 23 GPa) and ambient T to constrain the EoS of a new CMS compound with the composition Ca3MgSi2O8 and the space group C2/c. The obtained P–V data were fitted to the third-order Birch–Murnaghan EoS, yielding an isothermal bulk modulus \({K}_{T}\) = 108(2) GPa, its first pressure derivative \({K}_{T}^{^{\prime}}\) = 4.0(3) and room-P volume V0 = 658.0(4) Å3. If \({K}_{T}^{^{\prime}}\) is fixed as 4, then \({K}_{T}\) = 108(1) GPa and V0 = 658.0(3) Å3. In addition, no phase transition has been observed for this new CMS compound in the investigated P interval.

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Acknowledgements

The authors thank Zhaohui Dong, Wen Deng, Yichuan Wang and Zedong Shen for their help in conducting the compression experiments. This study was financially supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB42000000) and by the Program of the National Mineral Rock and Fossil Specimens Resource Center from MOST, China.

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Authors and Affiliations

  1. School of Earth and Space Sciences, Peking University, Beijing, 100871, People’s Republic of China

    Zhongying Mi, Xinjian Bao, Lifei Zhang & Xi Liu

  2. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education of China, Beijing, 100871, People’s Republic of China

    Zhongying Mi, Xinjian Bao, Lifei Zhang & Xi Liu

  3. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, People’s Republic of China

    Dayong Tan

  4. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing, 163318, People’s Republic of China

    Weiguang Shi

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  1. Zhongying Mi
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Correspondence to Xi Liu.

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Mi, Z., Bao, X., Tan, D. et al. Equation of state of a new calcium magnesium silicate compound with the composition Ca3MgSi2O8 at pressures up to 23 GPa and ambient T. Phys Chem Minerals 49, 2 (2022). https://doi.org/10.1007/s00269-021-01175-1

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