The present state of Earth and other rocky planets are an expression of dynamical and chemical processes occurring throughout their history. Plate tectonics is one of several planetary heat and mass transport regimes, and transitions into and out of this regime cannot be understood by looking at a single example. The rock-record, through geochemistry and magnetism, is used to interrogate changes in the tectono-thermal regime of Earth’s interior through time, while seismic imaging and gravity data, for instance, provide a snapshot of processes occurring in the contemporary mantle, crust and core. These classes of observations may be linked through geodynamic models, whose accuracy is underpinned by the physical properties (e.g., viscosity and density) of its constituent phases (minerals, melts and fluids). Information on the fundamental thermodynamic and physical behaviour of phases is subject to constant advance via experimental and ab-initio techniques.
This session aims to provide a holistic view of the dynamics, structure and composition of Earth, from core to atmosphere, and their evolution through time. We welcome contributions that address questions surrounding Earth’s major geological transformations and initial conditions that include, but are not limited to, study of the Hadean/Archean to better understand plate tectonic behaviour and transitions, magma ocean dynamics, oxidation of planetary interiors/atmospheres and the habitability of silicate worlds. Studies using a multidisciplinary approach are particularly encouraged.
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