Abstract
Geochemistry Plate tectonics on Earth are linked to the dynamics of the interior today. However, the interior dynamics in the distant past are a far greater mystery because of the subduction of surface rock. Wang et al. analyzed 3.5-billion-year-old rocks in China and discovered the oldest geochemical evidence of mantle plume magmatism along with high mantle temperatures. The rocks also appear to record chemical heterogeneity and may be evidence of convection in the deep mantle 3.5 billion years ago. Nat. Geosci. 12 , 672 (2019).
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