A research team led by Prof. Xiao Yilin from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) discovered the first diamond-magnesite-methane coexisting multiphase carbon-bearing inclusions in deep mantle wedge peridotite in subduction zone by using 3D Raman imaging analysis technique. The results were published in the National Science Review.
and hydrocarbons, but a certain amount of carbon remains transported and stored in the mantle in the form of ultrahigh-pressure minerals . The identification of carbon stored in the mantle is of great significance for understanding the deep carbon cycle and carbon transport processes.
In this study, the researchers chose a typical mantle wedge peridotite from an ultrahigh-pressure metamorphic zone , and carried out detailed petrographic and inclusions composition studies. They found that the inclusions in olivine and zircon are primary inclusions which represent the chemical composition of carbon-bearing melt/fluid in the deep-accounted mantle wedge of the
. Raman analyses showed that the ultrahigh-pressure indicator mineral diamond was captured in both olivine and zircon, and coexisting multiphase carbon-bearing inclusions were identified in olivine by three-dimensional imaging. The presence of carbonate inclusions in garnet lenses captured in peridotite bodies suggested that COmay be the dominant carbon-bearing phase in subduction zone CHO fluids. During subduction of the slab, rhodochrosite reacted with H
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