See more from this Division: Topical Sessions
See more from this Session: Exhumation of Continental Ultrahigh-Pressure Terranes
Abstract:
From an assumed position of minus 15 km, the vertical downward displacements from the original positions of the TMD and the KTU are estimated to be 115 and 40 km, respectively. By adopting the Leech (2005) subduction model ---lithosphere bends and subduction zones are curved--- and assuming a radius of 350 km for the bend, the subduction displacements can be estimated: 210 km for the subduction of the KTU beneath the ISZ and 85 km for the TMD beneath the KTU. Exhumation of the KTU and the northeastern TMD may have taken place by shear and slip in reverse direction, and by slip along the Zildat Fault.
The TMD was heated during its slow crustal exhumation at mid-crustal depths after an initial rapid ascent from the upper mantle. Petrologic evidence shows that the KTU did not experience the same late-stage heating event: mechanical coupling of the KTU with the TMD along the Karla Fault during initial stages of exhumation of the TMD can explain this lack of heating: the KTU had already been exhumed to the upper crust.
See more from this Division: Topical Sessions
See more from this Session: Exhumation of Continental Ultrahigh-Pressure Terranes