Projects

This project explores the history and evolution of spatial and temporal magmatic processes, potentially linked by feedback processes occurring in the arc crustal column. We utilize large compiled geochronologic and geochemical datasets to start to untangle the spatial, temporal, and chemical signals of arc flare-ups, migration, and magma focusing. More information on magmatic focusing in the central Sierra Nevada can be found in Ardill et al.  (2018).

The connection between upper-crustal plutons and volcanic rocks remains challenging to investigate, in part because exposures of multiple levels of the crust are rare. In the Sierra Nevada, hypabyssal intrusions, shallowly emplaced magma bodies, represent key structural and compositional markers that provide a window into the uppermost levels of magma plumbing systems. This study selects examples of hypabyssal intrusions in the central Sierra Nevada to investigate whether they represent feeder systems to volcanoes or failed eruptions (Ardill et al., 2020b).

Schlieren-bound structures are conspicuous features of plutons worldwide, and their formation process is debated. Whether schlieren form by active (magma flow) or static (thermochemical gradient) mechanisms has implications for magma rheology and mobility, as well as the processes that could occur within the magma chamber. The Tuolumne Intrusive Complex includes an unusually rich abundance of these structures, making it an ideal place to study. My approach combines field and structural analysis with whole-rock and mineral chemistry to learn more about the origin of these spectacular structures and their role in recording magma mush dynamics (Ardill et al. 2020a).