Magmatic Feedbacks on Tectonics

Dear Colleagues,

This Special Issue aims at collecting original research papers, short notes, and reviews on the interactions of tectonics and magmatism, from the granular to lithospheric scale.

Melt production, migration, and final emplacement of magma forming intrusions or volcanic complexes are common in a variety of tectonic settings, from convergent margins to extensional zones, and strongly contribute to the generation and reworking of the lithosphere. The initiation of magmatic systems might be ideally viewed as a purely thermodynamic issue; nevertheless, it has strong control over the rheology of crustal rocks and deformation. In fact, lithospheric-scale shear zones may enhance partial melting, acting as efficient channels for fluids and facilitating the rapid ascent of large volumes of magma through dykes and fractures. Yet, even small proportions of melt can dramatically modify the rheology of solid rocks, decreasing their viscosity by several orders of magnitude, with obvious consequences for the development of the highly permeable fracture networks required to feed large upper-crustal magmatic systems. Moreover, the flow of melts is expected to change the thermal structure of the crust, further enhancing the viscous behavior of otherwise cold and rigid domains. The interaction between magma and shear zones occurs at variable space- and time-scales, producing contact metamorphism, metasomatism and deformation of the country rocks, as well as syn-magmatic fabric in plutons. All of these structures potentially record the complex dynamics yielding to the growth of magmatic systems, and may provide insights into the mechanisms of magma emplacement. Thus, multidisciplinary approaches involving structural analysis, thermobarometry and pseudosection modelling, high-resolution geochronology, geophysics, and numerical or analogue modelling are useful to depict the relationships between magmatism and tectonics.

Therefore, we welcome contributions based on, but not necessarily limited to, the above methods. Feel free to send us a short abstract describing your research, to verify at an early stage if it fits the purposes of the Special Issue.

Dr. Leonardo Casini
Dr. Eugenio Fazio
Dr. Davide Zanoni
Guest Editors

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