Thermal Structure of the Paleo‐Continental Subduction Zone: Insights From Quantitatively Constrained Prograde <i>P</i> – <i>T</i> Paths of Exhumed LT/UHP Eclogites in the Dabie Orogen

The discrepancy of geothermal gradients predicted by numerical modeling and recorded peak metamorphic conditions exhumed high/ultrahigh pressure (HP/UHP) rocks triggers many uncertainties on the thermal structure subduction zones, which is especially significant for continental zones. Well-constrained prograde P‒temperature (T) paths HP/UHP reflect change in P–T during are insusceptible to later processes, making them robust recorders To make a reliable estimation zone, three low (L)T‒UHP eclogites Dabie orogen were robustly constrained using multiple thermobarometry method. results demonstrate that these underwent stages evolution from epidote amphibolite-facies at ∼450°C–470°C/11–13 kbar, through amphibole eclogite-facies 585°C–600°C/17–19 UHP 600°C–630°C/27–29 indicating continuously changing gradient ∼12°C/km lower crust depth (40 km) 10°C/km 60 km ∼6°C/km sub-arc (100 km). consistency this result average recovered origin suggests zones may have common characterized strongly concave upward gradient. A comparison study analytical models shows shear heating play crucial role