Nature CommunicationsDeep carbon cycling drives the splitting of the 520-km mantle discontinuityXinyue ZhangWei WeiYouyue ZhangZhu MaoNingyu SunDaoyuan SunWei LengTakashi YoshinoIzumi MashinoTomoo KatsuraJiewen LiWancai LiJung-Fu Lin2026-08-21Full textDOI https://doi.org/10.1038/s41467-026-76803-x