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深部碳循环是全球碳循环中的重要组成部分,它指通过板块俯冲过程把大洋底部的碳酸盐岩带到地幔中,然后再通过火山作用以CO2气体形式释放到大气中.目前对于深部碳循环的研究仍处在一个起步阶段.其中一个很重要的科学问题是火山作用释放的CO2中与俯冲相关的碳和原始幔源碳的比例.传统碳同位素可以很好的区分有机碳和无机碳,但火山作用释放的CO2中,大约95%的与俯冲相关的碳和原始幔源碳均是无机碳,因此传统的碳同位素方法无法区分.近年来Ca和Mg同位素在示踪壳内物质循环方面的研究取得很大的进展,本文针对以上科学问题,总结了近年来对于深部碳存储总量、通量及存在形式,洋壳俯冲过程中碳的行为,含碳地幔的熔融,深入探讨了C,Ca和Mg同位素示踪深部碳循环的原理和途径,以及前人在C,Ca和Mg同位素示踪深部碳循环等方面的研究成果.
Deep carbon cycle is an important part of the global carbon cycle, which refers to the subduction of the ocean floor by the oceanic carbonate rocks into the mantle, and then through the volcano as carbon dioxide gas released into the atmosphere for the current deep carbon Cyclic research is still in its infancy, and one of the most important scientific issues is the subduction-related carbon and mantle carbon ratio in volcanic carbon dioxide released by conventional carbon isotopes that distinguish between organic carbon and inorganic carbon However, about 95% of the carbon dioxide released by volcanism and the subducted carbon and mantle carbon are inorganic carbon, so the traditional carbon isotope method can not be distinguished. In recent years, Ca and Mg isotopes circulate in the tracer shell In view of the above scientific problems, this paper summarizes the recent research on the total carbon flux, the flux and the form of existence, the carbon behavior during the oceanic subduction and the melting of the carbonaceous mantle. C, Ca and Mg isotope tracer deep carbon cycle principle and approach, and predecessors in the C, Ca and Mg isotope tracing deep carbon cycle research results.