researchers running analysis on computer (IMAGE)
Caption
The researchers analyzed whole-rock chemical data from hundreds of samples of metasedimentary and metaigneous rocks — the types of rocks that make up much of the lower crust — and then categorized the samples by their peak metamorphic temperatures, when rocks undergo physical and chemical changes while remaining mostly solid. Andrew Smye, left, associate professor of geosciences, is pictured analyzing a rock sample with his student research team.
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Jaydyn Isiminger / Penn State
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