T12-S4. (Ultra)high-pressure metamorphism and its geodynamic significance

Jaroslaw Majka (jaroslaw.majka@geo.uu.se)
Daniela Rubatto (daniela.rubatto@geo.unibe.ch)
Matthijs Smit (msmit@eoas.ubc.ca)

Exhumed (ultra-)high pressure rocks represent the only direct witnesses of subduction zone processes in the geologic record. Studies into these rocks are needed to characterize reactive fluid flow, mineral reactions, deformation, and mass transfer at depth in subduction zones. Many of these processes are interlinked, operating in feedback cycles that ultimately influence global element cycles and trigger shallow and intermediate-depth earthquakes. Subducted continental rocks specifically provide a record of the deep dynamics that control the magmatic, structural and geomorphological evolution of mountain belts. Exhumation of any of these rocks marks a key point of geodynamic change in the development of active margins and mountain belts. This session invites contributions in petrology, tectonics, geochemistry, chronology and numerical modelling aimed at elucidating the tectonics and metamorphism of (deeply) subducted rocks at all scales of analysis.