Startseite Systematic study of high field strength elements during liquid immiscibility between carbonatitic melt and silicate melt
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Systematic study of high field strength elements during liquid immiscibility between carbonatitic melt and silicate melt

  • Wanzhu Zhang ORCID logo , Shuo Xue EMAIL logo , Ming-Xing Ling EMAIL logo und Xing Ding
Veröffentlicht/Copyright: 9. September 2024
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Abstract

Natural carbonatites exhibit a wide range of high field strength elements (HFSEs) and the highest Nb/Ta and Zr/Hf ratios among various rock types. However, primitive carbonatitic melts derived from carbonated peridotite do not display significant fractionation of Nb-Ta and Zr-Hf. To investigate this further, we conducted liquid immiscibility experiments to comprehend the differentiation of these HFSEs. Our experiments revealed substantial changes in partition coefficients for Nb, Ta, Zr, and Hf between carbonatite and silicate melts. We identified a positive correlation between the partition coefficients of these elements and Si, indicating that Si determines the differentiation of Nb-Ta and Zr-Hf during liquid immiscibility. The partition coefficients of Si increase as temperature increases and pressure decreases, resulting in higher HFSE concentrations during the early stages of liquid immiscibility. Liquid immiscibility is crucial in differentiating HFSEs in carbonatitic melts, explaining the association between super large carbonatite-related Nb deposits and Si-undersaturated silicate rocks.

Acknowledgments and funding

We thank Yonghua Cao for their technical support and for ensuring that the electron probe analysis was completed and Zhuoyu Liu for his support in high-T-P experiments. We also extend our thanks to the two anonymous reviewers for their valuable comments in improving the quality of this article. This work is supported by the National Key R&D Program of China (2021YFC2901705), National Natural Science Foundation of China (No. 42173024), and Jiangxi Double Thousand Plan (DHSQT22021005).

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Received: 2023-06-07
Accepted: 2023-11-23
Published Online: 2024-09-09
Published in Print: 2024-09-25

© 2024 by Mineralogical Society of America

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