Understanding the physical state of intermediate-to-silicic arc magmatic systems is necessary for our petrologic models of these systems. Researchers have generated a plethora of data—geophysical, geochronological, petrological, theoretical—over the past few decades. These data have changed how we view arc magmatic systems, leading to a model of crystal mush that is rejuvenated repeatedly over the lifespan of the magmatic system. However, much data are either circumstantial or incomplete. Paterson et al. (2016; October issue) use a combined set of textural, geochemical, and temporal data to demonstrate the changing physical state of the Tuolumne Intrusive Complex in California over its...

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