The metal content of magmas erupted at subduction zone arcs is thought to be derived from the mantle. A correlation between crustal thickness and copper content in arc magmas worldwide, however, reveals an important role for the crust in the upper plate.
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Lee, CT. Copper conundrums. Nature Geosci 7, 10–11 (2014). https://doi.org/10.1038/ngeo2039
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DOI: https://doi.org/10.1038/ngeo2039
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