Magma Chamber Rejuvenation: Insights from Numerical Models

Abstract

Most volcanic systems on Earth are characterized by chemically different magmas that can be found in the erupted products throughout their history. The reasons are multiple, including variations in the mantle source and/or crustal assimilation, as well as shallower processes such as fractional crystallization or mixing and mingling. Magma chamber rejuvenation indicates the processes that happen whenever a magma intrudes from the mantle to shallower depths and encounters an already established storage zone (i.e. a magma chamber or reservoir). Magmas rising from depth are typically characterized by higher temperatures, larger volatile contents and more primitive, mantle-like compositions than those residing in the shallow crust. The interaction with magmas that have already resided at shallower depths for a while (years to thousands of years) varies the physical and chemical properties of both the involved magmatic end-members. Typically, volatile-rich magmas coming from depth are lighter than degassed shallow magma; therefore, a gravitational instability sets in as the two come into contact, which generates convection and thus intense mingling and mixing among the two. These dynamic interactions cause variations in the physical and chemical properties of the magmas themselves, as well as in the stress conditons both inside the reservoir and in the host rock. The volcanic system as a whole enters an unrest scenario, that can evolve to eruption or not depending on the specific conditions. Numerical simulations of the dynamics within magmatic systems can shed light on the features of magma chamber rejuvenation, providing the time

Numerical simulations of magmatic enclave deformation

“…Instead of carrying out a systematic parametric study, we only considered cases where host and enclave characteristics (crystal content, melt densities and viscosities) follow natural trends expected when mafic material intrudes a more silicic host. This approach takes advantage of the fact that chemical and phase changes buffer the trends of these physical characteristics, thereby reducing the number of degrees of freedom (e.g., Scaillet et al, 2000;Montagna et al, 2017). As a result, the enclave material had systematically a higher particle volume fraction and a lower melt viscosity than the host.…”