1.Isotope tracing of fluid/mineral interactions during high- and ultrahigh-pressure metamorphism.
2.Elemental and isotopic fractionation during processes related to subduction.
3.Geochemical investigations on micro-scale of various minerals (mineral zoning).
4.Fluid inclusions in minerals.
Session: Fluids, melts, element mobility and isotope fractionation in subduction zones: Petrological and geochemical insights
Subduction zones are the most important site for proceeding matter- and energy- transports between the Earth’s surface and the interior, and relate to a number of important geological processes such as continental crust growth and mantle heterogeneity as well as ore deposit formation. During plate subduction and subsequent exhumation, fluid and melt can be generated in the (de)hydration process and partial melting process. They play important roles in elemental migrations, isotopic fractionations and mantle metasomatism. However, some fundamental issues still keep unclear or unknown. For examples, what are the types, physicochemical conditions and chemical compositions of melts/fluids in subduction zones? In which depth(s) fluid can trigger partial melting of the overlain mantle wedge and result in the coeval arc magmatism? What kinds of volatiles could be transported to mantle depth via deep subduction processes? What kind roles do the volatiles play in crust-mantle interactions, migration of elements and fractionation of isotopes. This session aims to present current studies on fluids, melts, element mobility and isotope fractionation in subduction zones, including all aspects of advances from natural and experimental observations. We invite contributions from petrology, mineralogy and trace element/isotope geochemistry of subduction zones that improve our understanding on the nature of fluids, melts, element mobility and isotope fractionation as well as geodynamics in subduction zones.