Revealing Magma Reservoirs: Using Melt and Fluid Inclusions to Reconstruct Magmatic Plumbing Systems
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Determining where magma reservoirs are located allows us to understand the processes that drive volcanic eruptions and better forecast future volcanic activity. Melt and fluid inclusions, tiny (1-100 micron) sized samples of silicate glass and fluids that are trapped during mineral growth in magma chambers, retain a chemical fingerprint of the processes that occur within these chambers. The minerals hosting these inclusions act as pressure vessels, and time capsules into the history of volcanic eruptions and geologic events. The pressure of these inclusions, revealed through the CO₂ concentrations of these inclusions, allows us to glance back in time to understand magma migration and storage to understand volcanic processes. This dissertation finds that fluid and melt inclusions align with deep, mantle magma chambers that drive CO₂-rich volcanic eruptions and that CO₂ is the main control of magma storage depths.