Pre-UHP titanite archives pro- and retrograde episodes of fluid-marble-interaction (Dabie Shan UHP unit, China)

Deeply subducted crustal carbonate rocks are major transporters of carbon into the asthenosphere. However, mechanism and extent of the interaction of carbonate rocks at mantle depth with external fluids remain unclear. Carbonate interaction with external aqueous fluids derived from silicate rocks is of particular importance, because the associated decarbonation and dissolution reactions (i) influence the input into the subduction carbon cycle,...