Abstract
The degree to which Earth's metallic core and silicate mantle interact at their interface has been difficult to constrain. In his Perspective, [Lee][1] discusses the report by [ Humayun et al .][2], who show that hotspot magmas (whose mantle source regions are believed to derive from the lower mantle) have anomalously high Fe/Mn ratios compared to magmas that sample the upper mantle. The authors present this as evidence for a lower mantle enriched in iron, possibly as a consequence of long-term chemical interaction between the core and the mantle. However, alternative explanations for high Fe/Mn ratios in magmas remain possible. [1]: http://www.sciencemag.org/cgi/content/full/306/5693/64 [2]: http://www.sciencemag.org/cgi/content/short/306/5693/91
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