Diapirism of carbonate platforms subducted into the upper mantle

Abstract Subduction of lithospheric plates at convergent margins leads to transport materials once close or the surface Earth great depths. Some them later return by magmatism degassing, whereas others end up being stored in mantle for long periods time. The fate carbon-bearing minerals subduction is particular interest because they can arbitrate long-term availability CO2 surface. However, there are major gaps understanding even most fundamental processes that modulate carbon pathways We use geodynamic models understand carbonate upon form large platforms, which were common Tethys realm Europe. conducted a series forward 1-km-thick platform entering subduction. show load detaches from subducting slab and rises diapirically through wedge eventually mixes with lithosphere. A smaller fraction gets accreted under forearc, an descends deeper into mantle. cold diapiric plume has significant role retarding silicate melting above these zones promoting formation small-volume carbonate-rich melts and, some cases, alkaline silica-undersaturated melts. propose amounts be as shallow uppermost