| 非传统稳定同位素示踪深部物质的理论模型与应用 |
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| 关键词:non-traditional stable isotopes deep material trace recycled carbonate basalt carbonatite |
| 基金项目:国家重点研发计划(编号: 2019YFA0708604)；国家自然科学基金项目(编号: 42072113; 42273051)；中国地质调查局地质调查项目(编号: DD20243516)；中国地质科学院基本科研业务费(编号: JKYQN202322) |
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| 摘要: |
| Theoretical Models and Applications of Non-traditional Stable Isotopes in Tracing the Deep Earth |
| Non-traditional stable isotope geochemistry has developed rapidly over the past two decades, emerging as powerful tools for tracing the composition, cycling, and evolution of deep Earth materials. However, the numerous factors that cause isotopic fractionation present challenges in quantitatively or semi-quantitatively extracting deep Earth information from isotopic data. In this paper, we first summarize the basic properties and potential applications of non-traditional stable isotopes in deep Earth area. We then propose a theoretical model with a mathematical formula incorporating variables of the isotopic composition of source materials and isotopic fractionation during high-temperature processes. Sepcifically, the variables include the isotopic composition of the initial mantle, the addition of recycled materials, the mantle metasomatism, the mineral composition of the source area, conditions of partial melting (such as oxygen fugacity, temperature and pressure conditions), magma evolution processes, and post-magma processes. By determing the primaly controlling factors and calculating isotopic fractionation values associated with different variables, this model allows for the quantitative extraction of information on deep Earth materials composition and igneous processes. An example of tracing recycled carbonates by Mg, Zn, and Ca isotopes is presented to show how this model can be applied to study the deep Earth. |
| SUN Jian.2025.Theoretical Models and Applications of Non-traditional Stable Isotopes in Tracing the Deep Earth[J].Acta Geoscientica Sinica,46(2):429-437. |
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