Two kinds of carbon cycle on Earth have been recognized:surface short-term and deep long-term carbon cycles(Berner,2003;Zhang et al.,2017).Over the years,the surface short-term carbon cycle has been attracted extensive attention because of their significance implications in the study of environmental changes of human beings.Recently,scientists found more than 98%carbon is stored in the solid Earth which takes great role on the surface carbon cycle(DePaolo,2015;Kelemen and Manning,2015;Plank and Manning,2019;Mao and Mao,2020).Therefore,the research of deep carbon cycle is very significant to the study of the formation and evolution,multi-layered interaction and habitability of the Earth.On the other hand,recent petrological study combined with high pressure-temperature experimental simulation shows that abiotic methane can be formed by the metamorphic reduction of carbonates during the subduction metamorphism(Tao et al.,2018;Wang et al.,2022;Zhang et al.,2023).
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