The decarbonization of deeply subducted oceanic crusts and genesis of super-deep eclogitic diamonds:progresses and challenges
Altered basalt of oceanic crust is one of the main host rocks for the transportation of carbon in subduction zones,I has the potential to transport significant amounts of carbon into the Earth's interior and to promote the cycling of carbon in the mantle.Diamond is a simple carbon directly sourced from the deep part of the mantle.It contains important information about the storage and migration processes of carbon in the deep part of the mantle.The high-pressure and high-temperature experiment is used as a forward modeling method to study the decarbonization process of the subducted oceanic crust.Eclogitic diamonds directly reflect the decarbonization process of subducted oceanic crust in the deep part of the mantle.The combination of these two methods can be used to completely characterize the decarbonization mechanism and carbon migration process of the deeply subducted oceanic crust.In this paper,we have summarized progresses of researches on the depth of deeply sourced ecologitic diamonds and progresses of the high-pressure and high-temperature experimental petrological studies on the subducted carbon-bearing oceanic crusts,discussed the genesis of eclogitic diamonds based on the comparative study,and finally proposed several directions worth for the further research.
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