Subduction zones are convergent plate boundaries where one lithospheric plate sinks beneath another, generating earthquakes and arc volcanism. While mature subduction zones have been extensively studied, the processes that lead to their initiation and early evolution remain poorly understood. This session focuses on the onset and tectonic development of subduction, highlighting the transition from early convergence to stable subduction and the associated magmatic and structural changes that occur. We welcome contributions that explore the initiation of subduction worldwide, the geodynamic and magmatic evolution of nascent or reactivated subduction zones, and novel approaches that shed light on these processes. Approaches may include field observations, geophysical imaging, geochemistry, petrology, modeling, and plate reconstructions. We aim to define priority research questions in subduction zone science and identify emerging methods for addressing them. This session encourages interdisciplinary discussions that broaden our understanding of how subduction zones begin and evolve over time.

• DI - Study of the Earth's Deep Interior
• NH - Natural Hazards
• S - Seismology
• V - Volcanology, Geochemistry and Petrology