About 90% of the Earth’s volcanism is associated with convergent or divergent plate boundaries and can thus be satisfactorily explained by plate tectonics. However, the origin of anomalous volcanism within both continental and oceanic plate interiors (i.e. intraplate volcanism) as well as unusual on-boundary volcanism (e.g. Iceland) is less advanced. This enigmatic volcanism was initially attributed to mantle plumes, but in recent years new models have been developed to explain its origins (e.g. edge-driven convection, sublithospheric drainage). Modern improvements in instrumentation, techniques, and data availability (e.g. spatial-temporal resolution) have greatly expanded our understanding of Earth dynamics and structure. Re-evaluation, refinement, and new models for the origin of intraplate and unusual on-boundary magmatism have also provided insights on deep mantle processes and the complex interactions between Earth’s asthenosphere, lithosphere, and surface. Understanding what triggers magmatism unrelated to plate boundaries is critical in understanding the evolution of Earth’s mantle, surface dynamics, volcanism, and chemistry through time, including the initiation of plate tectonics, climate, and life. It is also key to understanding lithospheric deformation in the presence of underlying magma, past and present volcanic catastrophes, and the environmental impacts of magmatism through time. With the rise of space exploration and the development of spacecraft data analysis, this knowledge is also crucial to the understanding of magmatism on other planetary bodies in the solar system and beyond. This session aims to bring together cross-disciplinary work on intraplate and unusual plate boundary magmatism to stimulate interactions between researchers with diverse ideas, observations, approaches, and backgrounds. We welcome contributions that apply any appropriate method including (isotope) geochemistry, petrology, geophysics, volcanology, seismology, numerical and analogue modelling, drilling, plate kinematics, tectonics, sedimentology, field and structural geology, or thermo- and geo-chronology. Studies focusing on Large Igneous Province (LIP) magmatism, wide magmatic rifted margins (e.g. Laxmi Basin), or magmatism associated with continental material far offshore (e.g. Rio Grande Rise) are particularly encouraged. We also encourage innovative studies, the spanning of spatio-temporal scales, and thought-provoking ideas that challenge conventions.