Analytical method description file: This method was designed primarily for analysis of volcanic glasses (e.g. tephra and obsidians) by EPMA (electron probe microanalysis) using the ARL-SEMQ electron microprobe at Concord University. This descriptor utilizes the tephra community EPMA-SEM method template, an implementation of the Community-based Recommendations on Collection, Analysis and Correlation of Tephra Data. See also https://earthchem.org/communities/tephra/
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