Nature research paper: Carbonate-rich crust subduction drives the deep carbon and chlorine cycles
. Our new high-pressure experiments show that most carbonates in carbonate-rich crustal rocks—one of the main subducting carbon reservoirs—survive devolatilization and hydrous melting in cold and warm subduction zones, indicating that their subduction has driven the deep carbon cycle since the Mesoproterozoic.
We found that KCl and NaCl, respectively, become stable phases crystallizing from hydrous carbonatite melts with low chlorine solubility in warm and hot subduction zones, resulting in the sequestration of chlorine in the solid residue in downwelling slabs.
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