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This lab assignment helps students to develop a detailed understanding of AFM diagrams and how they relate to pressure-temperature conditions of metamorphism of pelitic rocks. The lab is designed to be completed in two 3-hour lab sessions, at the end of which the students will be able to: Estimate the P-T conditions of equilibration of pelitic schists Determine whether different samples are related to each other via changes in pressure and temperature or changes in bulk composition Test assumptions about reaction histories. The lab follows an in-class lecture in which we graphically derive the AFM projection and talk in general terms about pelitic schists. The lab emphasizes going from real rocks to the phase diagrams to pressure-temperature space. I particularly emphasize extracting P-T information from pelitic schists using the AFM diagram (we revisit this qualitative approach after going through a quantitative thermobarometry exercise later in the course). I introduce the laboratory assignment via a PowerPoint presentation that is available from the Teaching Petrology website. My own version of this PowerPoint file includes several slides on the tectonic histories of the orogens from which my lab samples are derived (New England, Alps, New Mexico, etc.). The lab as written is obviously not directly transferable to other users as it is tied to specific thin sections and hand samples. However, the section below on Adaptations (in the instructors' notes, see below) suggests ways for other instructors to achieve the same goals, using their own sample suites. The lab as included in this volume contains brief answers in order to show the nature of the samples that I use and the level of expertise that I expect of my students. The AFM diagrams and P-T diagram are redrafted after Spear (1993). The AFM movie in the PowerPoint presentation is from Worley and Powell (1998), but similar movies can also be obtained from Spear (1999).
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