ArticleProceedings of the National Academy of Sciences of the United States of America2026
Ancient felsic sediments recycled through the deep mantle by plate tectonics.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Many petrological, geodynamical, and geochemical perspectives have offered circumstantial evidence for either an early onset of plate tectonics in the first 10% of Earth's history or a late onset after the great oxidation event (2.5 Ga ago). This calls into question over what timescales plate tectonics have influenced terrestrial geological and geochemical processes. We present geochemical data from the products of ancient crustal subduction, which were recycled into the deep mantle and then tapped by the modern Marquesas volcanic hotspot. We demonstrate that these materials have distinct short-lived radiogenic (
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