Processes that govern the properties, behaviour and mobility of volatiles and redox-sensitive elements during metamorphism are fundamental to our understanding of the formation and evolution of the solid Earth, its oceans, and atmosphere. This interdisciplinary session will focus on theoretical, experimental, and field based studies addressing the role of redox and acid-base mechanisms that have controlled the solubility, partitioning and transport of elements in the Earth's crust and upper mantle, from the Archean to the Phanerozoic. Emphasis will be placed on (1) the incorporation of volatiles and redox sensitive elements during hydrothermal alteration of the lithosphere (2) modelling, experimental and field characterization of redox partitioning during metamorphic reactions and partial melting, (3) integrated studies of the redox budget of subduction zones, as well as (4) methodological advances in the study of metasomatism in the lithosphere, including the mechanical aspects of mass transports.

Submission by early career scientists and graduate students are particularly encouraged.